Bosch 125HX NG User Manual

INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS

MODEL 125HX LP and 125HX NG

(Flow Modulated with Electronic Ignition)

Suitable for heating potable water only

Not approved for space heating purposes

Intended for variable flow applications with steady cold water inlet temperatures.

WARNING

If the information in this manual is not followed
exactly , a fire or explosion may result causing property
damage, personal injury or death.

FOR YOUR SAFETY

Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the
vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

- Do not try to light any appliance.

- Do not touch any electrical switch; do not use any

phone in your building.

- Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

- If you cannot reach your gas supplier, call the fire

department.

- Installation and service must be performed by a

qualified installer , service agency or the gas supplier.

WARNING: Improper installation,

adjustment, alteration, service or maintenance can
cause injury or property damage. Refer to this manual.
For assistance or additional information consult a
qualified installer , service agency or the gas supplier.

6 720 606 804 (02.10) AL

Upon completion of the installation, these instructions
should be handed to the user of the appliance for
future reference.
In the Commonwealth of Massachusetts this product
must be installed by a licensed plumber.

FEA TURING: Automatic V ariable Power Modulating Gas
V alve and power generated Electronic Ignition

T ABLE OF CONTENTS

Specifications .................................................... Page 2

Rules for safe operation .................................... Page 4

Locating the Heater ............................................ Page 4

Combustion Air Requirements ............................ Page 5

Mounting the Heater........................................... Page 5

Venting the Heater ............................................. Page 6

Gas Connections ............................................... Page 7

Gas Piping ......................................................... Page 8

Water Connections ............................................ Page 9

Safety before turning on the heater..................... Page 9

Operating instructions ...................................... Page 10

Setting water temperature ................................ Page 10

Maintenance & Service......................................Page 1 1

Trouble Shooting ...............................................Page 1 1

Electrical Diagram............................................ Page 13

Diagram of AquaS tar......................................... Page 15

Interior components diagram ............................ Page 16

Parts List ......................................................... Page 17

Principle of Operation:

When a hot water faucet is opened, the water flow through
the heater causes the gas valve to open. At the same
time the hydro-generator activates the electronics which
sends a spark to the pilot. The flame sensor confirms the
pilot has been lighted and allows the first two burners to
come on. The flame sensor confirms correct activation and
all burners come on. The pilot goes off. The heat exchanger
coils absorb the heat generated by the burners and transfer
heat to the water. When the hot water faucet is shut of f, the
gas valve automatically closes and the burners turn off.
Y our hot water faucet is an ignition key to activate the water
heater, giving you control over your hot water energy use.
Every time you turn off your hot water faucet, the energy
consumption of your hot water returns to zero.

AquaStar 125HX LP and 125HX NG Specifications

Gas Input max.: 117,000 Btu/hr

min.: 28,000 Btu/hr

Water Connection ½” Thread fitting NPT

H x W x D 29 3/4” x 18 1/4” x 8 3/4"
Vent 5”
CA TEGORY I GAS APPLIANCE
Gas Connection 1/2” NPT thread

FEATURES

- Electronic Pilot Ignition driven by hydro-generator

- High Quality Materials for Long Working Life.

- Copper heating coils for endless supply of hot water.

- Burner output proportional to hot water flow demand for
maximum energy efficiency .

- Safety flame sensor at pilot burner.

- Automatic overheating protection shut-off sensor .

- Flue gas safety device.

- St ainless steel burners with stabilized blue flame.

- Built-in corrosion resistant draft diverter .

- Compact space saver: mounts on a wall with two hooks.

- Easily removable one-piece cover.

- Easy one person installation.

- Adjustable water flow restrictor to ensure that water flow
demand will not exceed the heating capacity of the
heater.

- On/Off Switch to activate system.

Min. Water Pressure 18 Psi at 4 GPM
Max. Water Pressure 150 Psi
Shipping Weight 43 LB
Net Weight 40 LB

1.8 GPM at 90° rise

3.7 GPM at 45° rise
Min. Water Flow 1/2 gal/min
LP GAS Supply Pressure

(before Aquastar regulator) min. 1 1” W.C.

max. 14” W.C.*

Required LP GAS Pressure at inlet
tap while Aquast ar is operating: 10.5” W.C.

LP GAS Burner Manifold pressure while Aquastar is
operating at maximum input: 9.0” W.C.

Natural Gas Supply Pressure min.: 7” W.C.
(before Aquastar regulator) max.: 14” W.C.*

Required Natural Gas Pressure at inlet
tap while Aquast ar is operating: 5.7” W.C.

- Red LED indicator flashes with low water pressure.

- Green LED indicator main burner operation.

BOSCH is constantly improving our products, therefore
specifications are subject to change without prior notice.

Natural Gas Burner Manifold Pressure while Aquastar is
operating at maximum input: 4.2” W.C.

* Inlet gas pressure before Aquastar regulator must not
exceed this value. Pressure may need to be adjusted for
high altitudes, see page 7.

UNPACKING THE AQUASTAR HEATER

This heater is packed securely . The box includes one water connection fitting, a control knob, a gas pressure regulator ,
a pressure relief valve, an incandescent particle tray , two hooks for hanging the heater , this manual, a personal letter , a
warranty statement and a warranty registration card. Do not lose this manual, as there is a charge for replacement.
Please complete and return the enclosed warranty registration card.

2 6 720 606 804 (02.10)

FRONT VIEW SIDE VIEW

MINIMUM INST ALLATION CLEARANCES FROM COMBUSTIBLE AND NON
COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS

MODEL 125 HX

TOP (A) 12"
FRONT (B) 4"
BACK 0"
SIDES 4"
FLOOR (C) 12" *
VENT DIAMETER 5"

* Some local codes require 18” in garage installations

AQUASTAR MODEL 125HX

36 720 606 804 (02.10)

GENERAL RULES TO FOLLOW
FOR SAFE OPERATION

1. You should follow these instructions when you install

your heater. In the United States: The installation must
conform with local codes or, in the absence of local codes,
the National Fuel Gas Code ANSI Z223.1/NFP A 54.
In Canada: The Installation should conform with CGA
B149.(1,2) INST ALLATION CODES and /or local installation
codes.

2. Carefully plan where you install the heater. Correct

combustion air supply and flue pipe installation are very
important. If not installed correctly, fatal accidents can be
caused by lack of air, carbon monoxide poisoning or fire.

3. The place where you install the heater must have enough

ventilation. The National Fire Codes do not allow gas fired
water heater installation in bathrooms, bedrooms or any
occupied rooms normally kept closed. See the section below
on locating the heater.

4. You must vent your heater . See section on VENTING,

Page 6.

5. The appliance must be disconnected from the gas supply

piping system during any pressure testing at pressures in
excess of 1/2 Psig (3.5 kPa).
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or more than 1/2 Psig (3.5Kpa).
The appliance and its gas connection must be leak tested
before placing the appliance in operation.

6. Keep water heater area clear and free from combustibles

and flammable liquids. Do not locate the heater over any
material which might burn.

7. Correct gas pressure is critical for the optimum

operation of this heater (see specifications on page 2). Gas
piping must be sized to provide the required pressure at
the maximum output of the heater, while all the other gas
appliances are in operation. Check with your local gas
supplier, and see the section on connecting the gas supply .

The heater may still operate even when improperly vented.
It will, however, be less ef ficient and could eventually damage
the heater. It could even result in human sickness or death
due to oxygen deprivation and carbon monoxide poisoning.
Follow the guidelines below:

1. Place your heater as close to a vent or chimney as
possible.

2. National building codes require that you do not install
this appliance in bathrooms, bedrooms or any occupied
rooms normally kept closed.

3. Simultaneous operation of other appliances such as
exhaust fans, ventilation systems clothes dryers, fireplaces
or wood stoves could create a vacuum effect in your home
which could cause dangerous combustion by-products to
spill back into your home rather than venting to the outside
through the flue. Confirm that your Aquastar is venting
properly when all these other appliances are running. See
section on venting.

Do not obstruct the flow of combustion and ventilation
air to the appliance. If installed near a clothes dryer it is

very important that the dryer be properly vented. Failure to
properly vent a dryer could result in a gradual accumulation
of lint on the water heater fin coils and burners, leading to a
dangerous condition of vent blockage and poor unsafe
combustion.

4. Y our hot water lines should be kept short to save energy .
It is always best to have hot water lines insulated.

WARNING: The water in this water heater is cold

and always remains cold except for the times that hot
water is being used DO NOT INSTALL IN AN AREA

WHERE IT COULD FREEZE.
This heater is neither designed for nor approved for
outside installation.
Drain the heater entirely if freezing temperatures are
anticipated in area where heater is installed by
disconnecting both the inlet and outlet water
connections from the heater (disconnect the outlet flex
line from where it connects to the copper heat
exchanger). Additionally remove the drain plug under
the water valve. See Fig. 0.

8. Should overheating occur or the gas supply fail to shut

off, turn off the gas supply at the manual gas shut off valve
on the gas line.

9. Do not use this appliance if any part has been

underwater. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the
control system and any gas control which has been
underwater.

Fig. 0 - Water heater drain plug

PROPER LOCATION FOR INSTALLING
YOUR HEATER

Carefully select the location of your new heater. For your
safety and for proper heater operation, you must provide an
abundant supply of combustion air and a proper venting.

4 6 720 606 804 (02.10)

WARNING: Flammable materials, gasoline,

pressurized containers, or any other items or articles
that are potentially fire hazards must NOT be placed
on or adjacent to the heater. The appliance area must
be kept free of all combustible materials, gasoline
and other flammable vapors and liquids.

This product is not approved for manufactured homes
(mobile home), recreational vehicles (RV) or boats.
Reference ANSI Z21.10.3.
This product is neither designed or approved for

outside installations.

COMBUSTION AIR REQUIREMENTS

The AquaStar water heater holds cold water in its copper
heat exchanger and water valve when not in use. Because
of this, any cold air that comes in through the unit’s vent
pipe is capable of freezing these components. This
Installation Manual specifies the minimum vertical vent pipe
and the amount of combustion air required for this unit.
The vent pipe must not be restricted and its 6 foot minimum
height (provided there are no elbows) must terminate 2 feet
above any obstruction within a 10 foot radius.
When all requirements are followed, the unit will operate
properly and safely. However, there may still be a risk of
freezing due to negative draft if all the combustion appliances
in the area are not being supplied with a sufficient amount
of make-up air. A wood stove or furnace can rob the make­up air in the AquaS tar’s vent pipe, leaving the cold infiltrating
air capable of freezing the cold water in the AquaS tar heat
exchanger. More make up air is the solution. Follow the
instructions on venting and checking adequacy of make up
air. A HVAC specialist should be used to design solutions
for providing more make-up air if necessary.

Observe the following instructions concerning combustion
air.

Appliances located in unconfined spaces:
a) An unconfined space is one whose volume is greater

than 50 cubic feet per 1000 Btu per hour of the combined
rating of all appliances installed in the space.That would
be 5850 cubic feet for the AquaS tar 125HX alone.

b) In unconfined spaces in buildings of conventional frame,

masonry, or metal construction, infiltration is normally
adequate to provide air for combustion, ventilation, and
dilution of flue gasses.

Appliances located in confined spaces:
The confined space must be provided with two permanent
openings, one commencing within 12 inches of the top and
one commencing within 12 inches of the bottom of the
enclosure. Each opening must have a minimum free area
of one square inch per:

- 1000 Btu/hr if all air is taken from inside the building.

- 2000 Btu/hr if all air is taken from the outside by horizontal
ducts.

- 4000 Btu/hr if all air is taken from the outside by direct
openings or vertical ducts.

Or the confined space must be provided with one permanent
opening or duct that is within 12 inches of the ceiling of the
enclosure. This opening must have a minimum free area of
one square inch per:

- 3000 Btu/hr if all air is taken from the outside by a direct

opening or vertical duct.

Louvers, grills and screens have a blocking effect. If the
effective free area is not known, increase the sizes of your
openings by 75% if your louvers are wood and by 30% if
your louvers are metal. Refer to the National Fuel Gas Code
for complete information. In buildings of tight construction

all air should be taken from outside.

CLEARANCES

The Aquastar 125 HX is design certified for inst allation on a
combustible wall and for installation in an alcove or closet
with the minimum clearances to combustible and non ­combustible construction listed below

A. Top 12 inches (306 mm)
B. Front 4 inches (102 mm)
C. Back 0 inches
D. Sides 4 inch (102mm)

E. Bottom 12 inches (306 mm)
Clearance from vent is dependent upon the clearance rating
of the venting material used. For example: type B-1 vent is
approved for 1 inch clearance.

Note: Minimum clearance to combustible materials should
not be less than 6" for single wall flue pipe. Note that this
clearance can be reduced if combustible material are
protected as per table VI of the National fuel Gas Code or if
Type B gas vent is used.

MOUNTING INST ALLATION

The Aquastar 125 HX is design certified for mounting on a
wall.
Secure the two L shaped hooks provided with the heater to
a wall surface. Place them 13 ¼ inches apart as shown in
Fig 1.
Do not install this appliance on a carpeted wall or over floor
covering which is combustible, such as carpet. The heater
must be mounted on a wall using appropriate anchoring
materials. If wall is a stud wall sheathed with plasterboard,

it is recommended that support board(s), either 1x4’s
or 1/2" (minimum) plywood first be attached across a
pair of studs and then the heater should be attached
to the support boards. See Fig 1.

Expansion and contraction of piping due to changing water
temperature in the pipes imparts movement to the heater
which, if mounted directly to a brittle, friable board, such
as plasterboard, can cause failure of mounting.
In earthquake-prone zones, CEC recommends that
installers use a large washer and lag screw through the
existing holes used to hang the heater to affix the upper
third of the heater to the mounting board. T o affix the lower
third of the heater, CEC recommends that two new holes
be drilled in the heater’s frame, each one 16 inches below
the top two holes, and that washers and lag screws be
used to secure the lower portion of the heater to a spacing
board.

Before installing the unit, be certain you have the
correct heater for your type of Gas – Propane or Natural
Gas. Identification labels are found on the shipping
box, and on the rating plate which is located on the
right side panel of the cover. Also, each burner orifice is

stamped with a number (79 for LPG and 120 for Natural
Gas).

56 720 606 804 (02.10)

at least 1/4 inch for every foot of its horizontal length. Keep
the horizontal section short and avoid too many elbows.

WALL STUDS

13 ¼”

SUPPORT BOARD

1” X 4”

SPACE BOARD

Fig. 1 - Mounting the Heater

The incandescent particle tray (shipped loose in the carton
with the water heater) must be attached at the bottom of
the water heater front cover at the time of installation. Use
the screws provided. See figure 2

SCREWS

INCANDESCENT PARTICLE TRAY

Fig. 2 - Incandescent Particle Tray Illustration

VENTING

Vent pipe connection. W ARNING: Do not reduce

the vent pipe size.

This appliance must be vented to the outside following all
local ordinances and specifications for installing a gas
appliance vent or chimney. The venting system must be
designed and constructed so as to develop a positive flow
adequate to remove flue gasses to the outdoors. Minimum

vent size must be 5". Minimum vent height must be 6
feet, provided there are no elbows. Termination of
the vent must be 2 feet above any obstruction within
a 10 foot radius of the vent pipe. Consult your gas
utility or National Gas Fuel Code if vent will have
elbows or share venting with another appliance. The
vent connector should have as much vertical rise as
possible (minimum 12”) before any horizontal run.

Optional powervent (Model AQ-1) is available in order to
sidewall vent. In the Commonwealth of Massachusetts:

Powervented applications must utilize proof-of-draft
safety interlock device. Contact your local dealer. The

appliance must be located as close as practicable to a
chimney or vent. The vent pipe sections must be secured
to each other with sheet metal screws. Keep in mind the
minimum clearance from the top of your heater . Remember
also that single wall vent pipe connectors require a 6 inch
clearance from combustibles. National Fuel Gas Code
specifies double wall — T ype “B” — vent pipe be used in
cold climates and for gas vents running through attics. We
consider double wall vent pipe preferable in all
circumstances. Any vent section greater than 45 degrees
from vertical is considered horizontal.
Horizontal sections of vent connectors must slope upwards

T o check the draf t:

Close all doors and windows to the outside.
Turn on all appliances that force air out of the building.
These include all exhaust/ventilation fans, furnaces, clothes
dryers, wood burning stoves, etc.
Open all doors between the AquaStar and these other
appliances.
With the control knob set fully clockwise and strong hot
water flow rate, run the unit for at least 10 minutes. The
125HX is equipped with a Flue Gas Sensor; it’s mounted
on the right side of the draft diverter (Flue Gas Sensor #34
on page 17). If the main burners shut off during this test it
is because the Flue Gas Sensor has detected inadequate
venting. This is a serious health hazard and must be
corrected. Poor venting can result in soot building up inside
the heater, overheating of the heater and freezing of the
heat exchanger in a freezing environment, which is all a
result of negative air flow. Additional combustion air and/or
improved venting will be necessary to correct this.

WARNING

Note: The burners of an instantaneous “on demand” water

heater such as the AquaStar are only on at the time that
hot water is actually being used, the vent pipe is therefore
cold except for the short durations when hot water is being
used, it is therefore very important that the venting and air
supply be adequate to provide a good positive draft as
soon as the burners turn on. See venting guide on back
page.
The AquaS tar 125HX instantaneous water heaters have built­in draft diverters and are designed for indoor installation
only. The draft diverter outlet must be connected to a clear ,
unobstructed vent of the same size, or larger.

In Canada, CAN/CGA-B149 Installation Code for detailed
requirements
In U.S.A., ANSI Z223.1 - NFPA 54, National Fuel Gas
Code for detailed requirements.

The vent connection for the AquaStar 125HX is 5 inches.
However, in CANADA, for installations at high altitude (2000-
4500 feet above sea level) a six inch vent is required. A 5"
by 6" vent adaptor must be affixed to the vent collar of the
AquaStar with at least two screws. See figure 3.

WARNING: Failure TO INCREASE THE VENT SIZE

TO SIX INCHES AND/or assure that the manifold pressure
is set to proper value listed for applications at high altitudes
will cause unsafe venting, asphyxiation, and will void CSA
Certification.

5” X 6” ADAPT OR

USED ON HIGH AL TITUDE

Fig. 3 - Vent Adaptor for High Altitude Canadian

Installations

6 6 720 606 804 (02.10)

GAS CONNECTIONS and Gas Regulator

GAS LINE SIZING

NOTE: The Aquastar 125 HX is supplied with a gas
pressure regulator that must be installed on the heater
before attaching the gas supply line. See figure 4.
Failure to install the gas regulator as shown in figure
4 will be a violation of CSA certification of the unit.
The regulator supplied with the heater is preset for
the gas shown on the rating plate to the correct
pressure. It is an appliance level regulator designed
for (low inlet) pressure (less than 1/2 Psig or 15” W.C.)
DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural
gas line.

GAS INLET PIPE

PRESSURE TAP

PLASTIC VENT CAP

PRESSURE REGULAT OR
(with directional arrow on
reverse side pointing
upward)

Fig. 4 - Installation of Gas Pressure Regulator

The pressure regulator provided with the heater is adjusted
to deliver the proper gas pressure (as indicated on the
rating plate and in the manual for altitude up to 2000 feet
(660 meters) above sea level. On appliances being installed
above 2000 ft (660 meters) elevation, the inlet gas pressure
should be set at installation to the value shown below.

NOTE: The gas pressures specified below refer to
pressures taken at the pressure tap on the gas inlet
pipe just above the regulator (See Fig 4). These
readings should be taken while the heater is operating
at full input — i.e. maximum water flow with the
temperature dial selector turned all the way
clockwise.

MAXIMUM INLET GAS FLOW PRESSURE SETTING

Altitude Natural Gas Liquid Propane

inches W.C: inches W. C:

0' - 2.000 ft 5.7" 10.5"

2.000 ft - 4.500 ft 4.6" 8.4"

Above 4.500 ft consult your local gas provider .

-It is strongly recommended that the Natural Gas pipe
be Black Iron pipe the entire distance from the outside
meter to the inlet of the Aquastar regulator . 1/2” Black
Iron pipe up to 10 feet, 3/4” Black Iron pipe up to 40
feet and 1” Black Iron pipe up to 150 feet distances.
Flex line tubing is NOT recommended, but if used
then oversize it.

-It is strongly recommended that the LP Gas pipe be
semi-rigid copper or Black Iron pipe from the outside
regulator to the inlet of the Aquastar regulator. For
semi-rigid copper piping: 5/8” up to 20 feet and 3/4”
up to 60 feet distances. For Black Iron piping: 1/2” up
to 45 feet and 3/4” up to 160 feet distances. Flex line
tubing is NOT recommended, but if used then oversize
it.
THESE FIGURES ARE FOR AQUASTAR SUPPLY ONL Y ,
ALL OTHER APPLIANCES IN THE BUILDING WILL NEED
TO BE INCLUDED IN THE PIPE SIZING .

National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the recommendations
of the serving gas supplier.

WARNING: The heater must be disconnected from
the gas supply piping system during any pressure testing
of that system at test pressures in excess of 0.5 psig.
The water heater must be isolated from the gas supply
piping system by closing the manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or more than 0.5 psig.
The water heater, including the pressure regulator provided
with it, must not be operated at gas supply pressures in
excess of 0.5 psig. If overpressure has occurred, such as
through improper testing of the gas lines or malfunction of
the supply system, the gas valve and regulator must be
checked for safe operation. Make sure that the regulator
vent is protected against blockage.
When your connections are made, check for gas leaks at
all joints (not just the ones you made). Apply some soapy
water to all gas fittings and gas valve. Soap bubbles are

a sign of a leak.
NOTE: Do not apply soap solution to the pilot or pilot orifice

area. If you have a leak, shut off the gas. Af ter verifying that
required gaskets are in place, tighten appropriate fittings
to stop leak. Turn the gas on and check again with a soapy
solution. Never test for gas leaks using a match or
flame.

76 720 606 804 (02.10)

GAS PIPING, CONNECTIONS and Gas Regulator

Before connecting the gas supply , check the rating plate on the right side of the front cover to be sure that the heater is
rated for the same gas to which it will be connected.
In the United St ates: The installation must conform with local codes or , in the absence of local codes, the National Fuel
Gas Code ANSI Z223.1/NFP A 54.
In Canada: The Installation should conform with CGA B149 INST ALLA TION CODES and /or local installation codes.

GAS LINE SIZING

The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 117,000 BTUH. First
determine the effective length of the gas supply line by measuring the actual length of piping, and then adding 5 ft. for every elbow
or “T” to the actual length. Use the charts below to determine the pipe diameter necessary to accommodate the BTU demand
of the unit. If there are more gas drawing appliances on the line, size according to the maximum amount of BTU demand.

FOR NATURAL GAS

Maximum Capacity of pipe in Cubic Feet of Gas per Hour
for Gas Pressure of 0.5 Psig or less and a Pressure drop of

0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given
in thousands.

Nominal
Iron Length of Black Iron Pipe, Feet
Pipe Internal
Size, Diameter
inches inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200

Follow boxed numbers for piping just one Aquast ar 125HX
(example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle
152,000 btu’s). For multiple appliances combine the total
btu input load and then refer to applicable chart below.

1/4 0.364 32 22 18 15 14 12 11 11 10 9 8 8 7 6
3/8 0.493 72 49 40 34 30 27 25 23 22 21 18 17 15 14
1/2 0.622 132 92 73 63 56 50 46 43 40 38 34 31 28 26

3/4 0.824 278 190 152 130 115 105 96 90 84 79 72 64 59 55

1 1.049 520 350 285 245 215 195 180 170 160 150 130 120 110 100

1 1/4 1.380 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
1 1/2 1.610 1600 1100 890 760 670 610 560 530 490 460 410 380 350 320

2 2.067 3050 2100 1650 1450 1270 1150 1050 990 930 870 780 710 650 610

2 1/2 2.469 4800 3300 2700 2300 2000 1850 1700 1600 1500 1400 1250 1130 1050 980

3 3.068 8500 5900 4700 4100 3600 3250 3000 2800 2600 2500 2200 2000 1850 1700
4 4.026 17,500 12,000 9,700 8,300 7,400 6,80 6,200 5,800 5,400 5,100 4,500 4,100 3,800 3500

FOR LP GAS

Maximum Capacity of Pipe in Thousands of
BTU per Hour of Undiluted Petroleum Gases
(at 1 1 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water
Column).

Nominal
Iron Pipe
Size, Length of Pipe, Feet
Inches 10 20 30 40 50 60 70 80 90 100 125 150

1/2 275 189 152 129 114 103 96 89 83 78 69 63
3/4 567 693 315 267 237 217 196 185 173 162 146 132

1 107 732 590 504 448 409 378 346 322 307 275 252
1 1/4 220 149 121 103 913 834 771 724 677 630 567 511
1 1/2 330 229 185 155 141 127 118 108 102 976 866 787
2 622 433 346 299 264 239 220 204 192 1811 1606 1496

Black Iron Pipe

Copper

Maximum Capacity of Semi-Rigid
Tubing in Thousands of BTU per Hour of
Undiluted Liquified Petroleum Gases (at 1 1
inches Water Column Inlet Pressure)

(Based on a Pressure Drop of 0.5 Inch Water

Outside Length of Tubing, Feet
Diameter,
Inch 10 20 30 40 50 60 70 80 90 100

3/8 39 26 21 19 _ _____
1/2 9262 5041 37 3531292726
5/8 199 131 107 90 79 72 67 62 59 55

Column)

3/4 329 216 181 145 131 121 112 104 95 90
7/8 501 346 277 233 198 187 164 155 146 138

* Source National Fuel Gas Code NFP A 54, ANSI Z223.1.

8 6 720 606 804 (02.10)

WATER CONNECTIONS

When facing the heater, the cold water inlet is on your right
and the hot water outlet is on your left.
Although water piping throughout your structure may be
other than copper, we recommend that copper piping be
used for at least three feet before and after the heater (follow
local codes if more stringent). Keep water inlet pipe to no
less than 1/2 inch diameter to allow the full flow capacity .
Remember that water pressure must be sufficient to activate
the heater when drawing hot water from the top floor. If the
hot and cold connections to the heater are reversed, the
heater will not function. The AquaStar 125HX is provided
with one flexible type connector that must be connected to
the inlet fitting of the water valve as shown in Fig 5. ½”
Copper or brass fittings work best when connected to the
connectors. See Fig 6. The flexible type connector seals
to the water valve by means of a union connection with a
washer type gasket at the joint. No pipe dope or thread

tape is to be used at this joint.
This fitting seal to the water valve by means of a union
connection with a washer type gasket at the joint. No pipe
dope or thread tape is to be used at these joints. Be certain
there are no loose particles or dirt in the piping. Blow out or
flush the lines before connecting to the AquaS tar . Full port
valves should be installed on both the cold water feed line
and the hot water outlet line to facilitate servicing the heater.
For installation on a private well system, be sure that the
water pressure is set between 30 and 50 psi.

The discharge line must be installed such that it allows
complete drainage of both the PRV and the line.
The location of the PRV must be readily accessible for
servicing or replacement, and be mounted as close to the
water heater as possible. See Fig 7. To install the PRV , a
suitable fitting connected to an extension on a “T” fitting
can be sweated to the hot water line.

Support all piping.

Fig. 7 - Pressure Relief Valve

OPERATING INSTRUCTIONS

Before proceeding with the operation of the heater make
sure that the system is filled with water.
Open the cold water inlet supply to the heater fully .
Open a hot water faucet to permit the water to fill the heater
and the piping and to eliminate the air trapped in the system
Close the hot water faucet after the water flows freely and
all the air has escaped from the system. The water heater
is now ready to operate.

Fig. 5 - Water valve - top view

THREADED ASSEMBL Y

1/2” FLEX

PIPE PRV TO
APPROPRIATE
DISCHARGE

SWEA TED ASSEMBLY

1/2” FLEX

PIPE PRV TO
APPROPRIATE
DISCHARGE

Fig. 6 - Plumbing connections for the Aquastar

125HX

Connecting the pressure relief valve (PRV)

A listed pressure relief valve supplied with the heater must
be installed at the time of installation. No valve is to be
placed between the PRV and the heater. No reducing
coupling or other restriction may be installed in the discharge
line.

FOR YOUR SAFETY READ BEFORE
OPERATING YOUR HOT WATER HEATER

Warning: If you do not follow these instructions exactly ,
a fire or explosion may result causing property
damage, personal injury or loss of life.

A. This appliance is equipped with electronic ignition for

lighting the pilot and main burners. When turning the heater
on, follow these instructions exactly.
B. Before operating the unit, set the On/Off switch to the
On ( ) position. The On/Off switch is located behind
the flip-down coverplate on the front panel strip. Smell all
around the appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air and will
settle on the floor.
WHA T TO DO IF YOU SMELL GAS

- Do not try to light any appliance.

- Do not touch any electric switch; do not use any phone

in your building

- Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

- If you cannot reach your gas supplier, call the fire

department.
C. Use only your hand to push in the on/off control button.
Never use tools. Follow these instructions exactly . If control
button is jammed, close the gas supply and call a qualified
service technician. Attempted forceful rep air may result in
a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control
system and any gas control which has been under water.

96 720 606 804 (02.10)

LIGHTING AND OPERATING INSTRUCTIONS

1. STOP! Read the safety information above on this label.

2. The gas valve must be shut off by putting the ON/OFF

switch to position “ ”. Wait five (5) minutes to clear
out any gas. If you smell gas, STOP! Follow “B” in the
safety information above. If you do not smell gas, go to
the next step.

3. This water heater is equipped with a safety pilot burner
and an automatic ignition control system.

4. Set the ON/OFF switch (flip down cover plate on front
panel strip) to the “ ” position. In this position, the
water heater is ready to use.

5. If the red LED indicator light is flashing, this is a warning
that the water pressure is not enough to ignite the main
burner.

6. Turn the hot water faucet on to the minimum flow rate
required to activate the heater. The automatic ignition
system first ignites the safety pilot burner which then
ignites the main burner in about 4 seconds.

7. The green LED indicator is on when the main burner is
on.

8. The pilot flame will extinguish 10-30 seconds after the
burners come on. The burners will remain on until the
hot water tap is turned off.

Fig. 8 - T emperature Adjustment Knob

The position you select on the temperature adjustment knob
will depend on the temperature of the incoming water (50°F
is average in the U.S.). In warm weather regions where the
incoming cold water is generally warmer, or during the hot
weather months in some other areas a midway setting on
the temperature adjustment knob would produce a
temperature rise of about 70°F, giving an output of
approximately 120°F . At this setting, if it is still necessary ,
one could mix a small amount of cold water in a shower
and have a comfortable shower at about 3 gallons/minute.
During the colder months, or in cold climate areas, it might
be necessary to set the control to the maximum position,
all the way clockwise to the right.

If you supply the AquaStar 125HX, with preheated water
(i.e.) in a solar installation the unit could overheat. It will

then shut off on safety when the outlet temperature reaches
194°F . For this type of application, purchase a solar model
125B LPS or 125B NGS.

NOTE: On a first time initial installation, existence of air in
the gas supply line and in the water line may cause some
ignition delay . In that case, repeatedly open and close the
hot water tap in order to restart the ignition process until
all the air has been purged.

TO TURN OFF GAS TO APPLIANCE

Turn off the manual lever on the gas supply line to the
heater and set the ON/OFF switch to the OFF ( )
position. See Fig 9.

SETTING THE WATER TEMPERATURE

The AquaStar 125 HX LP and 125 HX NG water heaters
have a gas control that modulates burner input in response
to flow. Its purpose is to ensure that the hot water
temperature will remain steady, although the water flow
demand might vary (down to 1/2 gal/minute). T o adjust the
temperature on your AquaS t ar , turn on a hot water faucet
to its maximum flow. At the water heater, turn the large
knob located beneath the main gas control on the front of
the heater all the way to the right (clockwise). See Fig 8.
This will produce a temperature rise of approximately 90°F
at flow rates between 0.5 and 2.0 gallons per minute. Given
that average incoming water temperatures are 50°F, this
heater will produce approximately 140°F water at these
flow rates. Turning the dial all the way to the left
(counterclockwise) will produce a temperature rise of
approximately 45°F for flow rates between 1.1 and 3.7
gallons per minute. It is safest to select a comfortable
temperature and not have to mix in cold water.

To st art and to shut down
the appliance press the
button “ ”.
The switch is located
behind the flip down
cover plate on the front
panel strip.

- on

- off

Green light on = main
burner on.

Green light off = main
burner off.

If the red light is flashing,
that means the water
flow is not enough to
ignite the burner.

Temperature Adjustment Knob

Decrease
temperature and
increase flow

Increases temperature

and decreases flow

G661_004

Fig. 9 - Principles of Operation

10 6 720 606 804 (02.10)

MAINTENANCE AND SERVICE

REVIEW MAINTENANCE TABLE ON THE BACK OF THIS
MANUAL.

Approximately once a year, the AquaSt ar should be checked
and cleaned. To remove the front cover, first remove the
incandescent particle tray, then pull off the temperature
adjustment knob and unscrew and remove the plastic collar.
Pull main cover out toward you and lift up and out. THE
FOLLOWING OPERATIONS SHOULD BE PERFORMED
BY A QUALIFIED SER VICE PERSON:

Vent System: Should be checked annually. Clean and
repair as needed.

Water V alve (Part # 8707002649): The water valve on this
heater should be serviced periodically . Lubricate component
36 on page 16 with a small amount of silicon, faucet or
lithium grease every two years to keep its o rings fresh and
pushrod sliding smoothly. Every 3-5 years replace
component 36 on page 16. The frequency will depend on
the mineral content of the water and conditions of use or
whenever signs of corrosion appear at the gas and water
valve joint. Periodically check that the water inlet filter (#27
on page 16) is clean as well. NOTE: If water valve is removed,
be sure to also inspect the o ring seal on the end of the
right hand side water pipe before re-installing. Lubricating
the o ring with lithium or faucet and valve grease is
recommended.

To clean the pilot burner and/ or the pilot orifice : Turn
off the gas to the unit. Set the On/Off switch to Off (position

). Remove the cover of the heater. To do so, pull off
the temperature adjustment knob and unscrew and remove
the plastic collar. Pull main cover out toward you and lift up
and out. The pilot orifice should be cleaned or replaced. Do

not enlarge the orifice.

Do not use any wire or sharp object to clean orifices. Natural
gas orifices are large enough that you can usually clean
them by blowing through them. LP orifices, on the other
hand, are too small to clean and should be replaced.
To access the pilot orifice, remove 2 screws holding pilot
assembly in place. Then loosen compression fittings to
expose pilot orifice.

PILOT ORIFICE

Pilot Flame: The pilot flame should burn with a clean,
sharp, blue flame and should resemble the diagram in
Fig.10. If the flame is soft and yellow, the pilot burner orifice
may need to be cleaned or replaced. The pilot flame should
be approximately 2 inches long, extending past the flame
sensor. If the flame is too small, it will not reach the flame
sensor and the burners will not come on.

3mm

Correct gap between pilot
burner tip and electrode tip

Piezo Electrode

Fig. 11 - Pilot burner with pilot orifice

(Pilot assembly shown without pilot hood)

Main Burner Flames: The main burner flames should be
blue, with a more intense blue cone in the center core.
Y ellow flames could be a sign of wrong size gas orifices or
dirty burners, or a blockage on the heat exchangers fins.
If some burners have yellow flames while others have good
flames, it is likely that dust, lint or spider webs have partially
clogged the burner venturis. T o clean the burners, contact
a gas service person.

Mineral Scale Build-up: The AquaStar heater, when
operated at lower temperature settings, does not
accumulate mineral build-up. If however, the heater is used
at the higher temperature settings and the water has a
high mineral content, periodic descaling may be necessary .
The heating coils should be flushed with a descaling
solution. The descaling is done only to the heat
exchanger. The chemicals will damage the hydro-generator
and other parts. Consult your dealer or Controlled Energy
for instructions.

TROUBLE SHOOTING

Flame sensor

Piezo

Fig. 10 - Characteristic Pilot Flame

(Pilot assembly shown without pilot hood)

Introduction

The AquaStar 125HX burners are activated by a water flow
valve. Numerous water related problems can cause this
water valve to malfunction such as: Insufficient water flow
volume to activate the burners at its minimum flow
requirement; Dirt in the water flow valve causing it to
malfunction; Sediment build-up in faucet aerators, or shower
heads; Uneven pressures between cold and hot. (with single
lever faucets) Plumbing cross overs. These water flow
related problems can cause the heater to deliver less than
its full output, or to fail to ignite or to shut down completely .

116 720 606 804 (02.10)

Problems are stated in upper case, bold face. Most common
causes for the problems follow in order of likelihood. The
suggested solutions require that the cover be taken off. To
do this, remove incandescent particle tray, pull off the
temperature adjustment knob and unscrew and remove the
plastic collar. Pull main cover out toward you and lift up

and out.

NO SPARK AT THE PILOT

1. On/Off switch is not ”On” (Position ).

The On/Off switch is located behind the flipdown cover plate
on the front panel strip. See fig. 9.

2. Cross over in water lines

T o confirm there is no cross-over in the plumbing, shut of f
the cold water supply to the AquaStar and open all hot
water faucets. There should not be any water flowing at
any faucets. Water running is a sign of a plumbing cross­over. Consult your plumber .

3. Water flow is not sufficient to activate heater.

Water flow rate at faucet is below minimum flow needed to
activate heater. When temperature adjustment knob is
turned all the way clockwise, the AquaStar model 125HX
requires 1/2 gallon per minute flow to activate the heater.
As a reference, this is a flow which would fill a quart jar in
30 seconds. If the temperature adjustment knob is turned
fully counterclockwise, a flow rate of 1.1 gallons/minute is
required to activate the heater.
The red LED light (located behind the coverplate on the
front panel) flashes when the water flow is not enough.

4. Water inlet filter is clogged

Water flow is restricted, preventing needed flow to activate
heater. Clean water inlet filter screen.

SP ARK APPEARS AT PILOT WHEN HOT WA TER TAP
TURNED ON, BUT PILOT AND BURNERS WILL NOT
IGNITE

1. Air in the Gas Line

Normally this is a problem at time of initial installation,
after the pipes have been worked on, or after a gas supply
line has been allowed to empty. Bleed the air trapped in
the gas line by turning the hot water faucet on and off until
the air has been cleared from the line.

2. No gas to the AquaStar

A. Gas cock on gas line may not be open
B. Gas regulator may be shut or damaged. Replace or
unlock the regulator. Note: The regulator furnished with the
heater is exclusively designed for low gas pressure.
Excessive pressure will lock it up. Locking usually happens
when using propane gas if the gas pressure between the
gas tank and the water heater’s gas regulator has not been
reduced. See Page 2 for recommended correct gas
pressure. To unlock a regulator, consult your gas supplier
or call CEC.

3. Pilot orifice or gas valve is dirty

Clogging of the pilot burner can be caused by dust in the
air or dirt in the gas. The pilot orifice or gas filter may need
to be cleaned or replaced.

4. Pilot electrovalve switch may need to be replaced
(See Fig 13).

Call CEC.

5. Electronic Control Box may need to be replaced
(See Fig 13).

Call CEC.

5. Cold incoming water connection made to wrong
side of heater

Make sure cold water inlet connection is on the right side
of heater when you are facing heater .

6. Water valve parts may be dirty or components
damaged

First check that venturi is free of dirt particles. Water valve
and component parts must be totally free of dirt. In hard
water areas, mineral deposits can eventually (3-5 years in
hard water areas) corrode the water valve parts to a point
where they will need replacing. Any sign of moisture or

corrosion at the joint of the water valve and the gas valve is
a sign that the water valve components need to be serviced
immediately.

7. Poor circuit connections at the ECO (overheat
sensor) or the flue gas safety device

Ignition sparker will not operate if the electrical circuit is
interrupted. Check that the connections to the ECO and
Flue Gas Safety Device are secure and tighten if necessary .

If the Aquastar is Powervented, check spill switch reset

12 6 720 606 804 (02.10)

PILOT LIGHTS BUT BURNERS WILL NOT COME ON

1. Confirm water valve assembly is working properly .

2. Confirm the flame sensor is in its proper position.

3. Confirm the burner electrovalve switch is
functioning properly.

Call CEC

4. The Electronic Control Box (Fig. 13) may need to
be replaced.

Call CEC.

5. Flue gas safety device tripped

Ventilate the room and re-ignite the appliance 10 minutes
later. If it happens again, contact your service person or
Controlled Energy ..

WA TER IS TOO HOT

1. Temperature Selection too high

Turn the temperature adjustment knob counter-clockwise
(to the left) to lower the maximum water temperature.

Note: This will increase the activation flow rate.

2. Inlet water temperature is too hot (as with solar

preheated water or high ground water
temperatures)

Decrease gas pressure. Note: Only the Model “S”
AquaStar should be used if the inlet water is preheated.

WATER IS NOT HOT ENOUGH

1. Temperature selection too low.

Change the setting. Turn the temperature adjustment knob
clockwise (to the right).

Note: This will decrease the activation flow rate.

Fig. 13 - Electrical wiring diagram

1 burner electrovalve
2 gas control valve
3 pilot electrovalve
4 flame sensor
5 pilot electrode
6 overheat sensor
7 temperature limiter

8 electronic control box
9 LED failure indicator

10 LED indicator main

burner operation

11 on/off switch
12 hydro-generator
13 flue gas safety device

MAIN BURNERS GO OUT DURING HOT WATER USE

1. Flow rate diminished below activation rate

2. Unbalanced pressure in the water lines

The added restriction caused by the AquaStar in the hot
water system can result in uneven pressures between the
cold and the hot. In such cases when mixing cold water at
the tap, the lower hot water pressure may be overpowered
by a much higher cold water pressure, which may cause
the AquaStar burners to shut down. Make sure faucet
aerators and showerheads are free of minerals and dirt.
Do not add any flow restrictor to the shower head.

3. Minimum inlet pressure on well is inadequate

Check the inlet water pressure. On a private well, raise the
minimum pressure setting to 30 psi. Confirm that the
pressure tank is not water logged.

4. ECO (overheat sensor) tripped due to overheating

re-ignite the appliance 10 minutes later. If it happens again,
contact your service person or Controlled Energy .

2. Btu input is too low due to insufficient gas pressure

It is extremely important for a tankless
instantaneous water heater to have the right size
gas line to obtain the correct gas pressure

See specifications on page 2. Unlike storage tank water
heaters, the burners of a tankless water heater must be
very powerful to heat water instantaneously since they do
this only at the time hot water is actually being used. It is
therefore imperative that the gas pressure requirement
be met exactly. Insuf ficient gas pressure will directly affect
the water temperature at the time of usage. See page 2
for correct gas pressure settings and fig. 4 for locations
where gas pressures are taken.

3. Btu input is too low due to insufficient gas supply

Make sure your main gas line is fully opened. If using LP
gas, be sure that the size of the propane tank is adequate
to supply the required gas pressure.

4. Cold water is mixing with the hot water between
the AquaStar and the outlet

Compare water temperature at outlet of the AquaStar (hold
the AquaSt ar’s outlet pipe with your hand) and at the tap.
If these two are very different, check for mixing valve or
plumbing crossover (see “NO SPARK AT THE PILOT”
paragraph #4). Where automatic “anti-scald” valves are
required by code, lower the temperature setting on the
AquaStar as much as possible and balance the pressure
between cold and hot water after the AquaStar.

5. Parts in water flow valve are corroded so that the
gas passage is not fully opening.

Contact your service person or Controlled Energy .

136 720 606 804 (02.10)

HOT WA TER TEMPERA TURE FLUCTUA TES

1. Unbalanced pressure in waterlines

The added restriction caused by the Aquastar in the hot
water system can result in uneven pressures between the
cold and the hot. In such cases when mixing cold water at
the tap, the lower hot water pressure may be overpowered
by a much higher cold water pressure, which may cause
the Aquastar burners to shut down. Make sure faucet
aerators or shower heads are free of minerals. Do not

add any flow restrictor to the shower head.

2. Cold water is mixing with the hot water between
the AquaStar and the outlet

See #4 under “NO SPARK AT THE PILOT”.

3. Inlet water pressure is erratic due to inadequate
supply water pressure or saturated pressure tank
on well system

Check the inlet water pressure. On a private well, raise
minimum pressure setting to 30 psi. Confirm that the
pressure tank is not water logged.

4. Gas pressure is too low

See page 2 for correct specifications.

14 6 720 606 804 (02.10)

Fig. 14 - Diagram of AquaStar 125 HX

1

3

2

4
5

6
7

8

10

9

12

11

6 720 606 804-10.1AL

1. Heat exchanger

2. Pilot assembly

3. Burner manifold gas
pressure test nipple

4. Main gas burner

5. Pilot gas tubing

6. LED failure indicator

7. on/off switch

8. LED operation indicator

9. Water valve

10. Temperature adjustment selector

11. Gas inlet gas pressure test nipple

12. Hose

156 720 606 804 (02.10)

Fig. 15 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST

16 6 720 606 804 (02.10)

Fig. 15

INTERIOR COMPONENTS DIAGRAM

AND PARTS LIST 125HX

1 Cover 8 705 421 752
2 Temperature adjustment knob 8 702 000 111
3 Temperature adjustment collar 8 700 403 008
4 Draft diverter 8 705 505 354
5 Heat exchanger 8 705 406 235
7 Main burner 8 708 120 298 NG
7 Main burner 8 708 120 296 LP
8 Burner assembly washer 8 710 103 060

9 Throttle disc 8 700 100 174 LP
10 Pilot burner 8 708 105 491 LP
10 Pilot burner 8 708 105 337 NG
11 Piezo electrode 8 718 107 067
12 Pilot orifice 8 708 200 069 NG
12 Pilot orifice 8 708 200 312 LP
13 Pilot tube 8 700 707 370
14 Washer pilot tube 8 700 103 173
15 Gas valve 8 707 011 917 NG
15 Gas valve 8 707 011 945 LP
16 Diaphragm switch 8 708 504 021 NG
16 Diaphragm switch 8 708 504 049 LP
17 Pilot electrovalve 8 708 501 249
18 Burner electrovalve 8 708 501 250
19 O-ring 8 700 205 023
20 Hydro-generator 8 707 406 043
21 Cold water pipe 8 700 705 947
22 Outlet flex hose 8 700 703 139
23 Washer 8 700 103 658
24 Water valve 8 707 002 649
25 Water valve cover 8 705 500 101
26 Diaphragm 8 700 503 053
27 Water inlet filter 8 700 507 001
28 Water valve selector screw 8 708 500 289
29 Volumetric water governor 8 705 705 009
30 Venturi 8 708 205 279
31 Electronic control box 8 707 207 085
32 Flame sensor cable 8 704 404 040
33 Electrode cable 8 704 404 039
34 Flue Gas Sensor 8 707 206 345
35 Set of cables 8 704 404 038
36
37 O-ring 8 700 205 120
38 O-ring 8 700 205 119
39 Water connection gasket 8 710 103 043
40 Water elbow fitting 8 700 703 114
41 Overheat sensor (ECO) 8 707 206 040
42 Connecting pipe hot 8 700 715 178
43 Washer 8 710 103 045

Pushrod

8 700 306 114

176 720 606 804 (02.10)

18 6 720 606 804 (02.10)

196 720 606 804 (02.10)

INSTALLATION CHECKLIST

i

GAS LINE SIZE

Natural Gas

Nominal Iron Pipe Size* 1/2" 3/4" 1"

MAXIMUM LENGTH

10' 40' 150'

Liquid Propane

Semi-rigid Tubing 1/2" 5/8" 3/4" 7/8"

MAXIMUM LENGTH

* Flex tubing greatly reduces capacity and, therefore, is not recommended.

NOT

RECOMMENDED

20' 60' 150'

Minimum Vent Size* and Height

Minimum Diameter Minimum Height**

5 inches 6 feet

* NOTE: Vent size must not be restricted. Installation must comply with national fuel gas code venting requirements

for a 117,000 Btu Category I appliance and any applicable local codes.

** NOTE: Minimum vent height must be 6 feet, provided there are no elbows. Termination of the vent must be 2

feet above any obstructionwithin a 10 foot radius of vent pipe. Consult your gas utility or National Gas Fuel Code

f vent will have elbows or share venting with another appliance. The vent connector should have as much vertical

rise as possible (minimum 12") before any horizontal run.

Water Pressure

For installation on well systems, insure that the minimum pressure tank setting is between 30-50 psi.

11egapeesELBATECNANETNIAM

RAEYYREVESRAEY2YREVESRAEY5-3YREVE

EVLAVRETAWETACIRBUL

EVLAVRETAWDLIUBER

NEERCSRETLIFRETAWTCEPSNI

YLBMESSATOLIPTCEPSNI

YLBMESSATNEVTCEPSNI

RENRUBNIAMTCEPSNI

Replacement Parts available from North American

Distributor

†
†
†
†

†

CONTROLLED ENERGY CORP.

340 Mad River Park

Waitsfield, Vermont 05673

Phone [phone]

Fax [phone]

www.controlledenergy.com

[e-mail]

VULCANO T ermodomésticos S.A.

Estrada de Cacia

3801 - 856 Aveiro - PORTUGAL

†

Recycled paper

© 2001 Controlled Energy Corporation,
Waitsfield, VT all rights reserved