Hubbell Electric Heater 110-2 Installation Manual
INSTALLATION, OPERATION, AND
MAINTENANCE MANUAL FOR
THE HUBBELL TANKLESS WATER HEATER
ELECTRIC HEATER COMPANY
Edition 2011
HUBBELL
ELECTRIC HEATER COMPANY
P.O. BOX 288
STRATFORD, CT 06615-0288
PHONE: (877) 649-8589
FAX: (203) 378-3593
INTERNET: http://www.buytankless.com
Important Safety Information
1. You must read and follow all instructions. Serious bodily injury or death could occur
if you ignore this warning.
2. All circuit breakers and/or disconnect switches servicing the heater must be turned off
when installing, uninstalling, or repairing this water heater.
3. The Hubbell Tankless Water Heater must be grounded.
4. The unit must be installed by a licensed electrician and plumber.
5. The unit must be wired in accordance with the current version of the National
Electrical Code (US) or Canadian Electric Code (Canada).
6. This installation must comply with all national, state, and local plumbing and
electrical codes.
7. When the heater is not within sight of the electrical circuit breakers, an additional
local means of disconnection of all ungrounded conductors must be provided that is
within sight of the appliance or a circuit breaker lockout must be used. (Ref. NEC
422.31)
8. If the Hubbell Tankless Water Heater is installed in a location where water damage
could occur in the event of a leak, it is recommended that a drip pan be installed and
connected to a suitable drain. Alternatively, an active water leak detector and shut off
valve can be installed to turn off your water supply in the event a leak is detected.
9. If water supply has a high mineral content, a water softening system is recommended.
Damage to the water heater resulting from scale or hard minerals will not be covered
under warranty.
10. When the heater is installed in a well water system or if the plumbing system is prone
to introducing air into the heater, it is highly recommended that an air separator be
installed in the cold water feed to the heater to avoid possible failure of the heating
element and/or heating chamber.
2
3
TABLE OF CONTENTS
SECTION TITLE PAGE No.
I TANKLESS WATER HEATER OPERATING PRINCIPLE 4
II GENERAL DESCRIPTION AND CONSTRUCTION 5
III INSTALLATION 10
IV OPERATION AND MAINTENANCE 14
V TROUBLESHOOTING 19
VI SERVICING & REPLACEMENT OF PARTS 25
VII PARTS LIST 29
VIII WARRANTY 30
APP. I SUB-PANEL WIRING DETAILS 33
SECTION I – TANKLESS WATER HEATER OPERATING PRINCIPLE
How the Hubbell Tankless Water Heater Works:
For the most part, operating your new tankless water heater is very similar to using any
traditional water heater system. However, it is very important that you carefully read all of
the set-up procedures and operating instructions to ensure maximum performance and
energy savings from your new water heater.
Your Hubbell Tankless Water Heater does not store hot water like a conventional tank-type
water heater. It contains high powered heating elements that are capable of heating water
instantly on-demand as you need it. As soon as you turn on a hot water faucet, a
sophisticated flow sensor within the heater recognizes that you have turned on the water.
This sensor measures the water flow rate while two other sensors measure the incoming and
outgoing water temperature. This information is transmitted continually to the
microprocessor controller which determines the precise amount of power to send to the
heating elements to heat the water to your desired temperature. The Hubbell tankless water
heater only uses as much power as is needed to meet the demand by fully modulating the
heating elements from 0 to 100%. Since your new water heater works on a demand basis, it
will absolutely never run out of hot water no matter how many back to back showers you
run!
It is important to keep in mind that every tankless water heater has a maximum flow rate. If
you exceed this flow rate, the heater will not be capable of fully heating water. How much
hot water your heater can provide will depend on the model you have selected and your
incoming water temperature. If you live in an area of the country where inlet cold water
temperature average 55° F or you have cold winters, you will probably NOT be able to run
multiple large water demand fixtures at the same time. However, you will be able to run all
your hot water fixtures back to back without ever having to wait. You will enjoy
UNLIMITED HOT WATER. See the charts in Section II to determine the maximum flow
rates.
Moreover, since a tankless water heater eliminates the ongoing thermal losses caused by
storing hot water in a tank, you will enjoy significant energy savings over a conventional
tank type water heater.
When you use hot water from a conventional tank type water heater, you need to mix a
considerable volume of cold water to cool the hot water down to a safe, comfortable level.
You need to do this because the heater is set at an extremely high temperature to prevent it
from running out of hot water quickly. With a tankless water heater, you typically set the
temperature at a much lower level since it is capable of heating your water on demand. This
level will be much closer to the actual temperature at which you feel comfortable showering
or bathing. As such, you will no longer need to mix much cold water to run a shower or
bath; in fact, you may mix very little or no cold water. This is perfectly normal and means
that you are no longer wasting energy by overheating your water.
4
SECTION II – GENERAL DESCRIPTION AND CONSTRUCTION
Product Overview:
Inlet Temp. Sensor
Heating Element Temperature
Controller
Heating Chamber LED Digital Display
(with buttons)
Hi-Limit Switch
Element Switching
Device (Triac)
Outlet Temp.
Sensor Power Distribution
Block
Ground Lug
Flow Meter
Hot Water Outlet
Drain
Inlet Temp. Sensor
Heating Element Temperature
Controller
Heating Chamber LED Digital Display
(with buttons)
Hi-Limit Switch
Element Switching
Device (Triac)
Outlet Temp.
Sensor Power Distribution
Block
Ground Lug
Flow Meter
Hot Water Outlet
Cold Water Inlet
Drain
Cold Water Inlet
3-Element Design (Models 280-3, 240-3, and 220-3)
2-Element Design (Models 180-2, 165-2, 145-2, and 110-2)
5
Hubbell Tankless Water Heater Selection Overview:
Min. Required
Model
No. kW
280-3
240-3
220-3
180-2
165-2
145-2
110-2 11 45.8 100 1.2 1.3 1.4 1.5 1.7 1.9 2.1 2.5
27 112.5 200 2.8 3.1 3.4 3.7 4.1 4.6 5.3 6.2
24 100.0 200 2.5 2.7 3 3.3 3.6 4.1 4.7 5.5
21 87.5 200 2.2 2.4 2.6 2.9 3.2 3.6 4.1 4.8
18 75.0 150 1.9 2.1 2.2 2.5 2.7 3.1 3.5 4.1
16 66.7 125 1.7 1.8 2 2.2 2.4 2.7 3.1 3.6
14 58.3 100 1.5 1.6 1.7 1.9 2.1 2.4 2.7 3.2
Amps @
240V
Home Service
(Amps)
Max. flow (GPM) of water heated to 105°F with
incoming cold water temperature of
40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F
Note: Recovery rates (GPM) are based upon an actual supply voltage of 240 volts with no
voltage drop. If the actual supply voltage is less than 240 volts, the recovery rating (GPM) will
be reduced. Please see the wattage de-rating and flow rate formulas at the end of Section II to
determine the actual power (kW) and recovery rate (GPM) when voltage is less than 240 volts.
Tankless Pressure Drop Chart:
Technical Specifications Common to All Models:
Materials: Copper Exchanger /
Stainless Steel Casing
Voltage: 208-240 Volts / 1 Ph Operating Range: 5 – 150 psi
Frequency: 50 / 60 Hz Protection: Thermal Auto Reset
Energy Efficiency: 98%
6
Plumbing
Connection:
¾” Copper, CPVC,
or PEX
Model 280-3
Our most powerful residential electric tankless water
heater. This 27 kW water heater is configured for
cold climates where the incoming water temperature
can drop below 45° F. The Model 280-3 is well suited
for homes in the northern U.S. and Canada, and those
in the southern U.S. that have large Roman-style or
Jacuzzi tubs and that have generally more demanding
water usage needs.
Technical Specifications:
Inl et
Temp.
(°F)
Maxi mum Flow Rate (GPM
Outlet Temp. (°F)
100 105 110 115 120
3.1 2.8 2.6 2.5 2.3 2
40
3.4 3.1 2.8 2.6 2.5 2
45
3.7 3.4 3.1 2.8 2.6 2
50
4.1 3.7 3.4 3.1 2.8 2
55
4.6 4.1 3.7 3.4 3.1 2
60
5.3 4.6 4.1 3.7 3.4 3
65
6.2 5.3 4.6 4.1 3.7 3
70
7.4 6.2 5.3 4.6 4.1 3
75
Dimensions: 17” x 16.2” x 3.6”
Weight: 20 lbs.
kW / Elements: 27 kW / 3 elements
Customer Double-Pole
Circuit Breaker / Fused
Disconnect Required:
1 x 125A or
2 x 60A or
3 x 40A
Max. Amps: 112.5 A @ 240 V
Model 240-3
The 24 kW water heater is configured for climates
where incoming water temperatures are in the 50° 70° F range. The Model 240-3 is suitable as a whole
house water heater.
Technical Specifications:
Inl et
Temp.
(°F)
Maxi mum Flow Rate (GPM
Outlet Temp. (°F)
100 105 110 115 120
2.7 2.5 2.3 2.2 2.1 1
40
3 2.7 2.5 2.3 2.2 2
45
3.3 3 2.7 2.5 2.3
50
3.6 3.3 3 2.7 2.5 2
55
4.1 3.6 3.3 3 2.7
60
4.7 4.1 3.6 3.3 3 2
65
5.5 4.7 4.1 3.6 3.3
70
6.6 5.5 4.7 4.1 3.6 3
75
Dimensions: 17” x 16.2” x 3.6”
Weight: 20 lbs.
kW / Elements: 24 kW / 3 elements
Customer Double-Pole
Circuit Breaker / Fused
Disconnect Required:
1 x 110A or
2 x 60A or
3 x 40A
Max. Amps: 100 A @ 240 V
Model 220-3
The 21 kW, water heater is configured for cold
climates where the incoming water temperature can
drop below 55° F. The Model 220-3 is well suited
for homes in the northern U.S. and Canada, and
those in the southern U.S. that have large Romanstyle or Jacuzzi tubs and that have generally more
demanding water usage needs.
Technical Specifications:
Inlet
Temp.
(°F)
Maximum Flow Rate (GP
Outlet Temp. (°F)
100 105 110 115 120 1
2.5 2.3 2.1 2 1.9 1
40
2.7 2.5 2.3 2.1 2 1
45
3 2.7 2.5 2.3 2.1
50
3.3 3 2.7 2.5 2.3
55
3.8 3.3 3 2.7 2.5 2
60
4.3 3.8 3.3 3 2.7 2
65
54.33.83.332
70
654.33.83.3
75
Dimensions: 17” x 16.2” x 3.6” Max. Amps: 87.5 A @ 240 V
Weight: 20 lbs. Customer Double-Pole
kW / Elements: 21 kW / 3 elements
Circuit Breaker Required:
1 x 100A or
2 x 50A
)
125
.2
.3
.5
.6
.8
.1
.4
.7
)
125
.9
.1
2.2
.3
2.5
.7
3
.3
M)
25
.8
.9
2
2.1
.3
.5
.7
3
7
Maximum Flow Rate (GPM)
Model 180-2
The 18 kW water heater is configured for climates
where incoming water temperatures are in the
60° -70° F range. The Model 180-2 is suitable as a
whole house water heater.
Technical Specifications:
Inl et
Temp.
(°F)
40
45
50
55
60
65
70
75
Outlet Temp. (°F)
100 105 110 115 120 125
2.1 1.9 1.8 1.6 1.5 1.4
2.2 2.1 1.9 1.8 1.6 1.5
2.5 2.2 2.1 1.9 1.8 1.6
2.7 2.5 2.2 2.1 1.9 1.8
3.1 2.7 2.5 2.2 2.1 1.9
3.5 3.1 2.7 2.5 2.2 2.1
4.1 3.5 3.1 2.7 2.5 2.2
4.9 4.1 3.5 3.1 2.7 2.5
Dimensions: 13.5” x 16.2” x 3.6” Max. Amps: 75 A @ 240 V
Weight: 16 lbs. Customer Double-Pole
kW / Elements: 18 kW / 2 elements
Circuit Breaker Required:
1 x 80A or
2 x 40A
Model 165-2
The 16 kW Model 165-2 is designed for moderate
climates where the coldest incoming water
temperature is 60° F or greater. As a whole house
model, the Model 165-2 is best suited to homes in the
southernmost regions of the U.S. (i.e. Southern
California, Texas, Florida, etc.), as well as Mexico
and the Caribbean.
Technical Specifications:
Inlet
Temp.
(°F)
Maximum Flow Rate (GPM)
Outlet Temp. (°F)
100 105 110 115 120 125
1.81.71.61.51.41.3
40
2 1.8 1.7 1.6 1.5 1.4
45
2.2 2 1.8 1.7 1.6 1.5
50
2.4 2.2 2 1.8 1.7 1.6
55
2.7 2.4 2.2 2 1.8 1.7
60
3.1 2.7 2.4 2.2 2 1.8
65
3.63.12.72.42.2 2
70
4.43.63.12.72.42.2
75
Dimensions: 13.5” x 16.2” x 3.6” Max. Amps: 67 A @ 240 V
Weight: 16 lbs. Customer Double-Pole
kW / Elements: 16 kW / 2 elements
Circuit Breaker Required:
1 x 80A or
2 x 40A
Model 145-2
The 14 kW Model 145-2 tankless water heater is
configured for climates where the lowest incoming
water temperature is above 70° F. The Model 145-2
is used primarily in warm climates as a whole house
unit in tropical climates.
Technical Specifications:
Inl et
Temp.
(°F)
Maximum Flow Rate (GPM)
Outlet Temp. (°F)
100 105 110 115 120 125
1.6 1.5 1.4 1.3 1.2 1.1
40
1.7 1.6 1.5 1.4 1.3 1.2
45
1.9 1.7 1.6 1.5 1.4 1.3
50
2.1 1.9 1.7 1.6 1.5 1.4
55
2.4 2.1 1.9 1.7 1.6 1.5
60
2.7 2.4 2.1 1.9 1.7 1.6
65
3.2 2.7 2.4 2.1 1.9 1.7
70
3.8 3.2 2.7 2.4 2.1 1.9
75
Dimensions: 13.5” x 16.2” x 3.6” Max. Amps: 59 A @ 240 V
Weight: 16 lbs. Customer Double-Pole
kW / Elements: 14 kW / 2 elements
Circuit Breaker Required:
1 x 70A or
2 x 35A
8
Model 110-2
The 11 kW Model 110-2 tankless water heater is
designed for moderate climates where the lowest
incoming water temperature is above 70° F. The
Model 110-2 is a point of use or booster model in
warm climates as opposed to a whole house water
heater.
Technical Specifications:
Inlet
Temp.
(°F)
Maximum Flow Rate (GPM)
Outlet Temp. (°F)
100 105 110 115 120 125
1.3 1.2 1.1 1 0.9 0.9
40
1.4 1.3 1.2 1.1 1 0.9
45
1.5 1.4 1.3 1.2 1.1 1
50
1.71.51.41.31.21.1
55
1.91.71.51.41.31.2
60
2.11.91.71.51.41.3
65
2.52.11.91.71.51.4
70
3 2.5 2.1 1.9 1.7 1.5
75
Dimensions: 13.5” x 16.2” x 3.6” Max. Amps: 46 A @ 240 V
Weight: 16 lbs. Customer Double-Pole
kW / Elements: 11 kW / 2 elements
Circuit Breaker Required:
1 x 50A or
2 x 25A
Alternate Voltage Table
The tables below lists the power in kW and the amperages for each model when connected
to voltages other than 240 volts.
Model
No.
280-3
240-3
220-3
180-2
165-2
145-2
110-2
Wattage De-rating Formula:
2
Applied Voltage
Rated Voltage
2
Power (kW)
Connected Volta
208 220
20.28 22.69
18.03 20.17
15.77 17.65
13.52 15.13
12.02 13.44
10.52 11.76
8.26 9.24
ge
230
24.80
22.04
19.29
16.53
14.69
12.86
10.10
Model
No.
× Rated Wattage = Actual Wattage
280-3
240-3
220-3
180-2
165-2
145-2
110-2
Amp erage
Connected Voltage
208 220 230
97.50 103.13 107.81
86.67 91.67 95.83
75.83 80.21 83.85
65.00 68.75 71.88
57.78 61.11 63.89
50.56 53.47 55.90
39.72 42.01 43.92
For example: If installing a 27 kW unit, Model 280-3, when actual voltage is 212 V,
2
212
2
57,600
240
=
44,944
= 0.78 × 27,000 W = 21,060 W @ 212 V
Amperage Formula:
Watts
=Amps (Single Phase)
Volts
Flow Rate Formulas:
To determine power (kW) requirement
____GPM × ____ °F ΔT × 0.1465 = ____ kW
To determine temperature rise
____ kW × 6.824 ÷ ____ GPM = ____°F ΔT
To determine flow rate
____ kW × 6.824 ÷ ____ °FΔT = ____ GPM
9
SECTION III – INSTALLATION
WARNING: Serious bodily injury or death may occur if the following warnings are
ignored.
Locating and Mounting Instructions:
Your tankless water heater can be installed just about anywhere! Due to the small size of
your water heater, it can be mounted in many small spaces, including closets, under sinks, in
pantries, or under stair storage areas. However, there are some important guidelines to
follow that will ensure that your installation is both safe and convenient in the event that
future servicing is required.
This product is designed to be installed indoors only. You may be able to install your unit in
an outdoor location as long as it is mounted in a suitable enclosure that protects it from rain,
splashed water, direct sunlight, debris and insects. This product should NOT be installed in a
location where it may be subjected to freezing temperatures. If the water inside your tankless
water heater freezes, it can cause severe and permanent damage that is not covered under
your warranty. If you suspect that your tankless water heater may have frozen, do not turn
on the heater until it has thawed and you have inspected the system for leaks.
When selecting an installation location, give consideration to your existing plumbing
configuration, location of your main electrical panel, and location of your bathroom, kitchen
and laundry area. Try to choose a location that does not require you to make major
plumbing alterations, that is close to your main electrical panel (this will reduce the amount
of wire that you need to install), and that is physically close to the hot water fixtures that
you use most often. By locating the heater close to the points-of-use, you will reduce the
amount of time it takes for the hot water to travel from the water heater to your faucet. You
should also give consideration to future servicing. Do NOT locate the water heater in a
location that is difficult to access. In most cases, installing your tankless water heater in the
same location as your old conventional tank-type water heater will make the most sense.
You should avoid installing your tankless water heater in a location prone to excessive
humidity, moisture, or dust, or in an area where it may be splashed with water or other
liquids. Do NOT install under water pipes or air conditioning lines that might leak or
condense moisture that could then drip onto the heater. Do NOT install above electrical
boxes or junctions.
If you plan to install your water heater on a second floor or in a heated attic space, make sure
that you follow all code requirements for such installations as required for your area. We
recommend that you install a drip pan (connected to a drain) below the water heater to avoid
property damage in the unlikely event of a leak. Alternatively, you can install an active
water leak detector and shut-off valve designed to turn off your water supply in the event
that a leak is ever detected.
Mounting the unit:
•
All circuit breakers and/or disconnect switches servicing this heater must be turned
off before installing, repairing or uninstalling this water heater.
•
Installation of this product is restricted to indoor locations.
•
Installation
MUST
be done by a licensed electrician and licensed plumber.
• Leave a minimum of 4” to both sides and 12” on the top and bottom of the unit.
• Mount the water heater securely to the wall by putting four (4) screws through the
mounting holes.
10
• Install a ¼” diameter bead of sealing caulk around the entire perimeter of the heater
between the heater back panel and the wall. This prevents any moisture or debris
from accumulating.
Plumbing Installation Instructions:
IMPORTANT INFORMATION:
• Ensure all fitting installations comply with local plumbing and building codes.
This water heater does not require a temperature and pressure (T&P) relief valve.
•
You may install a T&P relief valve if the county, city or state plumbing code requires
it.
• Installations in the Commonwealth of MASSACHUSETTS and KENTUCKY require
a
T&P
relief valve.
T&P
• When connecting to a plumbing system that utilizes Flex or PVC, a
relief valve
should be used as added safety.
•
Do not connect the unit directly to CPVC pipe. You must use at least three feet of
copper pipe prior to connecting to any CPVC connection.
• WARNING:
will damage the flow meter and void your warranty.
•
Before energizing the heater, run water for a minimum of three (3) minutes and
verify that all air has been removed.
Do not solder any pipes with the unit connected to the pipes. Doing so
•
Installation of an air separator device is recommended for installations where air can
be easily introduced into the water system (i.e. Well water systems, lake pumps, and
other municipal systems).
•
A shut off valve MUST be installed on inlet side of unit. A shut off valve on the
outlet is recommended.
Pipe Preparation:
• Cut the tube so that the ends are square. WARNING: Ensure that there are no burrs or
damage to the
cut end. This will prevent any damage to the internal o-ring.
• Once the tubing end is cut square and clean, mark the pipe to be installed at a distance
of 1 ¾” from the end of the pipe. This is the insertion depth.
• Check that fittings and tubing are
clean, in good condition and are free from damage
and foreign objects.
11
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