NextGen 4, 6, 14.4, 8, 12 Service Manual

Installation and Service Manual

Congratulations! You have purchased the most innovative electric boiler on the market. The NextGen BoilerTM will provide

comfort and efciency for your heating applications for many years to come.

WH Response LLC

USA Distributor/Importer

6800 Electric Drive

Rockford, MN 55373

Phone: [phone]

Fax: [phone]

www.nextgenboiler.com

B O I L E R

TM

TA BLE OF CO NTE NTS

Saf ety In str uct ion s 3
Nex tGe n B oil er Rat ing s a nd Spe cif ica tio ns 4
Pip ing Arr ang eme nt 6
Siz ing of th e N ext Gen Bo ile r 7
Des ign ed Temp era tur e D iff ere nti al 7
Cir cul ati ng Pum p I nfo rma tio n 7
Plu mbi ng Ins tal lat ion Gu ide lin es 8
Ele ctr ica l I nst all ati on 9

Ins t ruc t ion s fo r th e us e r

Con tro l P ane l 11
Hea tin g M ode / Ini tia l S tar t-U p 11
Wi nte r M ode (H eat ing Mode) 12
Sum mer Mo de (St and -by Mo de) 13
Adv anc ed Set tin gs 14
Tr oub les hoo tin g 15
Care and Maintenance 15
General Boiler View 16
Part List 17
Wa rra nty In for mat ion 19
Wa rra nty Re gis tra tio n 21

Ins t ruc t ion s fo r th e in s tall er

This appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities or lack of experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible for their safety. Children should
be supervised to ensure that they do not play with the boiler appliance.

Consider all piping and electrical connections before selecting boiler location.

Failure to follow the instructions in this manual could result in severe personal injury, death or property
damage.

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Saf ety In str uct ion s

!

1. Read and strictly follow the installation and operating instructions to ensure a longevity and reliable boiler
operation.

2. This manual provides general installation guidelines. Your installation must comply with ALL applicable local
codes.

3.

!

Always have a qualied electrician perform electrical wiring. Manufacturer will not be held responsible for

faulty installations which are performed by unqualied electricians. An efcient electrical installation which
has been completed in accordance with the binding norms of electric installation. Electric installation should
be equipped with electric circuit breakers and other solutions which will ensure disconnecting the boiler from
the source of power.

4. All installation work must be performed when the power and water supply is disconnected from the main
electrical panel.

5. This boiler must be installed vertically and on an even wall surface with access to plumbing connections on
bottom.

6. Any associated components (i.e. boiler, water tubing, valves, manifolds etc…) must be ushed before boiler
installation.

7. This boiler is equipped with a safety relief valve. Do not install any barrier tting or valve on the outlet of the
safety valve. Connect and extend ¾” copper piping from relief valve and terminate at least 6” from the oor
or oor drain.

8. This boiler is equipped with a 194°F manual reset safety high limit device. The reset button is clearly located
in the center of this device.

9. This boiler will not operate below a 7 psi water pressure level.

10. This boiler is equipped with a Wilo circulator pump. After thermostat temperature set point has been reached
the pump will continue to circulate water for 3 additional minutes as part of a post purge sequence to push
heated water away from heat exchanger.

11. This boiler is equipped with a differential pressure relief bypass valve. It allows the system to keep minimal
ow of heating water through the boiler and reduce noise in the installation when equipped with thermostatic
zone valves.

12. Do not drain the water from the boiler after the heating season.

13. In summer do not shut off the power supply (120 VAC and 240 VAC) and leave the controller in stand-by
(summer mode) between the heating seasons. The boiler is equipped with an exercise timer control feature
that allows the circulating pump to operate 15 minutes each day and will ensure longer operation the circulating
pump and will help to eliminate the buildup of debris. (See section “Summer mode (stand-by mode)”on
page 11).

14. Boiler is pre-set by the manufacturer to work with hydronic radiant oor, radiant ceiling, hot water baseboard
and water to air heat applications. Temperature adjustments can be made on control panel to meet these
applications requiring desired water temperatures between 85° - 140°F.

In st ru ct io ns f or t he i ns ta ll er

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Nex tGe n B oil er Rat ing s a nd Spe cif ica tio ns

Boiler Name NextGen-4 NextGen-6 NextGen-8 NextGen-12 NextGen-14.4

Boiler Type EKCO-4 EKCO-6 EKCO-8 EKCO-12 EKCO-14.4

Boiler Rated Power

kW 4 6 8 12 14.4

Btu/h 13,652 20,478 27,304 40,956 49,147

Voltage V 240

Rated Current A 16.66 25.0 33.3 50.0 60.0

Breaker Quantity- Amps A

1 @

30 amp

1 @

40 amp

2 @

40 amp

Heating Elements Quantity 3

Element Resistance / each Ω 43.3 28.8 21.6 14.4 12.0

Circulating Pump - Wilo Star S 21 U 15. 3 speed

Circulating Pump Voltage V 120V, 60Hz

Circulating Pump Amps A .97

Speeds 3

Fuse Rating 1.0 amp

Operating Temperature Range °F 85° - 140°

Inlet / Outlet Pipe Thread G ¾” (Internal Thread)

Expansion Vessel (14 psi.) Gallon 1.6

Safety Relief Valve Rating psi 30

Maximum Pressure psi 30

Minimum Pressure psi 7

Weight Lbs. 68.5

Dimensions L x W x D Inches

28” x 17” x 9 - 7/8”

12

14

16

18

Disposable/Available Pump Head

2

4

6

8

10

0.8

Head [ft]

Flow [gpm]

Setting 1

Setting 2

Setting 3

1.3

1.8 2.3 2.8 3.3 3.8

4.3

4.8

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NextGen Boiler Mounting Clearances

Flow Outlet Return Inlet

13-13/16"

1-6/16"

min.5-14/16"

min.2”

1-5/16"

min.2”

3-11/16"

2-3/16"

17”

28”

9-7/8"

boiler depth

ATTENTION INSTALLER

!

After reading instructions, please keep this manual with the boiler for future reference. Afx the plastic

holder to the outside of the boiler and insert manual in this pocket.

In st ru ct io ns f or t he i ns ta ll er

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Pip ing Arr ang eme nt

2

1

 [1]-boiler
 [2]-additional expansion

tank-ifneeded

Typical radiant oor heating
application

1

2

 [1]-boilers
 [2]-additional expansion

tank-ifneeded

Ne xtGen Boi lers pipe d
in parallel (cascade) to
achieve higher BTU output

2

1

▲

▲

3

NextGen Boiler piped in a
primary/secondary (P/S)
conguration. Consider
P/S w he n hi gh er ow
rates are necessary and
when the boiler meets the
intended heatloss of the
hydronic system.

 [1]-boiler
 [2]-additional expansion

tank-ifneeded

 [3]-lowlossheader

In st ru ct io ns f or t he i ns ta ll er

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Siz ing of th e N ext Gen Bo ile r

It is very important to conduct a heatloss analysis of the intended heated space. Select the boiler size in kW based
on its Btu/hr. rating that best meets the designed heatloss. It is important not to overly exceed the kW sizing as
this will lead to unnecessary costs of boiler, wiring and materials. Consequentially it is extremely imperative NOT
to undersize the boiler.

How to choose the correct boiler size? Convert BTU to kW by dividing the BTU load by 3,413.

(Ex. 33,513 BTU / 3,413 = 9.81kW). Choose a boiler that slightly exceeds this kW requirement by no more than
20%.

For larger BTU loads consider cascading the boilers together and pipe the system in a parallel conguration as
described in the piping arrangement section.

Note that utilizing propylene glycol freeze protection will reduce the heat transfer and cause the system
to be less efcient. Under no circumstance should more than a 50/50 ratio of water to propylene glycol
be used. Consult with radiant system designers for required freeze protection guidelines.

Des ign ed Temp era tur e D iff ere nti al

Radiant oor heating systems are typically designed for a 10°- 20°F temperature differential determined by when
the heating uid leaves the boiler and where it enters the radiant heat source. i.e. radiant PEX/tubing.

Cir cul ati ng Pum p I nfo rma tio n

This boiler is equipped with a Wilo Star S 21 U 15, 3 speed
circulating pump. To determine the speed or setting of the pump,
conrm with radiant design completed by others and or complete
a pressure-loss calculation. Refer to calculations of loop lengths
to determine proper speed.

The pump will automatically operate based on a thermostat call for
heat. After the thermostat temperature set point has been reached,
the pump will continue to circulate water for 3 additional minutes
as part of a post purge operation to push heated water away from
the heat exchanger.

In st ru ct io ns f or t he i ns ta ll er

This boiler is also equipped with an additional pump relay. This will aid the installer if there is any need to pipe the
systems with a secondary circulating pump to overcome pressure drop due to piping or hydronic tubing design.
This is commonly referred to as primary/secondary applications described in the piping arrangement section.

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Plu mbi ng Ins tal lat ion Gu ide lin es

1. Remove outer screws at the bottom and at the top of boiler and carefully open the front cover.

2. The boiler is wall hung and must be installed in a vertical position where plumbing connections are located
at the bottom. Utilize key holes slots to hang the boiler. Refer to diagram on clearances (page 5).

3. The boiler is provided with a 3/8” air vent located on top of the heat exchanger. It is designed to collect and
remove air. Ensure plastic drain tubing remains in place and exits the boiler in the lower right corner.

4. The boiler is equipped with a pre-charged at expansion tank located on the back housing of the boiler.

In st ru ct io ns f or t he i ns ta ll er

Expansion tank has a Shrader valve, which location

is shown on the gure. This gure presents the
bottom view of the boiler. Access to the valve is
only from the bottom of the boiler. From there it
can be connected any pressure gauge to check the
pressure or pump to rell the air inside the tank.

5. The boiler is equipped with an ASME approved 30
psi automatic safety pressure relief valve. Install the
necessary length of ¾” copper piping from the relief
valve to within 6” of the oor to prevent personal
injury or water damage to surrounding area.

6. Observe inlet return piping (blue) and outlet supply
feed piping (red) connections. Install full way shut

Shrader valve

off valves below inlet and outlet connections before plumbing the boiler to the hydronic heating system.
DO NOT reverse these connections to the radiant supply and return manifolds. Optional temperature or
pressure gauges can be installed below the boiler if desired.

7. Install a boiler drain valve(s) as necessary to aid in lling, purging and draining of unit and the related system
components.

8. Water supply feed or pressure reducing valve can be installed to comply with local building codes. Local
codes may require a back ow preventer called a check valve when installing a xed domestic water supply
line to the boiler.

9. When possible, ll the boiler and hydronic system with treated water. (i.e. soft or distilled water) This will
substantially extend the life of the heating elements and reduce sediment buildup.

10. Freeze protection additives can be added. Only use propylene glycol type freeze protection products for
hydronic heating systems that are non-toxic and corrosion resistant.

The propylene glycol mix shall not exceed 50%, by volume.

!

Under no circumstance should methanol or

ethylene glycol (automobile antifreeze) be added to the boiler system as this may damage internal components.

11. Insure purging of all air throughout boiler system and related components.

12. This boiler requires a minimum pressure of 7 psi in order to operate. Pressure levels for hydronic systems
typically are above the pre-charged expansion tank pressure level (12 psi).

If additional pressure gauges are installed verify reading as described on item 7.

13. The boiler is equipped with a pressure differential bypass valve. This allows the minimum ow rate to pass
through the boiler when all zone valves are closed. The valve will also help reduce noise issues upon closing
of zone valves or actuators.

To adjust: Turn valve clockwise all the way until it stops. Turn on

all heating zones and let run for a couple of minutes. Once the
return piping is hot slowly turn the bypass valve clockwise. This
opens the valve, feel the piping coming out of bypass valve, once
it starts getting hot stop turning the valve. This is referred to the
tipping point. Turn the valve clockwise for one complete turn. This
will place the valve just above tipping point.

14. Proceed to the Electrical Installation.

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Ele ctr ica l I nst all ati on

1. All electrical work should be completed in accordance to local or
state electrical and building codes.

2. This boiler must be electrically grounded in accordance with National
Electrical Code ASNI/NFPA70, or local codes.

3. This boiler operates with 240 VAC single phase electrical power
source.

4. Connect the boiler to the electrical service using

!

COPPER WIRE

ONLY. Tighten connections by using a 3/16” Hex key tool. Conform to

local electrical codes for correct sizing of electrical breakers and size
of electric conductor wires. Refer to boiler nameplate for current and
kW ratings. Local electric codes may require an electrical disconnect.

Electrical Wiring Diagram

L1 L2

!

For supply connections, use 10 awg or larger wires suitable

for at least 167°F (75°C)

5. The circulating pump requires a separate 120 VAC, 15 amp electrical circuit. Utilize ½”
electrical knockout as marked on the left side of cabinet to access circulating pump wiring
connections inside boiler. Do not combine the high voltage power for circulating pump with
any thermostat or off peak low voltage wires.

An optional secondary pump can be installed in the system for hydronic applications

plumbed with multiple circulators and or primary/secondary applications. Utilize the Pump
2 connections to operate the secondary pump. The secondary pump will automatically turn
on upon closure of thermostat connections on control panel. Spare fuses are taped into
the inside cover. Fuses specied as: Time-delay Glass Fuse 6.3 x 32mm 2A.

In st ru ct io ns f or t he i ns ta ll er

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OP

TT

Optional Utility

Off-Peak

Radio

Receiver

T-stat

T

ext

Outdoor

compensation

6. Thermostat - This boiler can be signaled to turn on from a standard
two wire thermostat, end switches of an actuating valve or a zone
control panel. These connections should all be voltage free (dry
contact). Extend wires from thermostat to TT connections on control
panel using 2 x 18 gauge wires. Utilize ½” electrical knockout to
left side of control panel to gain entrance to this connection. Install
thermostat in a location where it will not be inuenced by other heat
sources.

7. Off peak control (optional) -This boiler is equipped with a
connection (normally closed) to receive a utility signal for off peak
denoted by OP on the control board. Ensure the interconnection
from utility radio receiver is voltage free (dry contact). Consult with
local utility on questions with off-peak installations. Keep blue/white
jumper wire in place if not connected to a utility radio receiver.

8. Outdoor compensation (optional)- If desired, the boiler can utilize
an outdoor sensor (part #01564, purchased separately) for outdoor
compensation capability. Install the outdoor sensor preferably on
the north side of the building. Keep the outdoor sensor away from
any sources of heat. Refer to Advanced Settings on page 14 to set
proper heat curve. If no outdoor sensor is wired to the T

ext

terminals

on the control panel, the boiler will work in normal operation

9. Final check. Verify all electrical connections are tight. Loose
connections can cause premature failures of electrical components.

In st ru ct io ns f or t he i ns ta ll er

Once you have nished the above procedures and before starting the boiler, understand the control buttons
and indicators on the control panel in the following page.

10. Re-fasten the screws on bottom (2) and top (1) to hold front door in place.

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In st ru ct io ns f or t he u se r

Con tro l P ane l

The control panel consists of two working areas: the signaling area and control buttons. The user can select the
following working modes: winter mode (heating mode) or summer mode (stand-by mode). Utilize the push button
arrows to scroll through the different working parameters of the boiler. The control panel will automatically switch to
main view if no buttons are pressed within 1 minute. After learning the indicators proceed to initial startup section.

The control panel allows the user to identify ow rate (GPM),the inlet and outlet operating temperatures and the
Btu/h of the boiler at any given time. It will also aid in identifying any faults, which may occur, by displaying the
fault codes.

Indicators

X100Btu/h=Britishthermalunitsperhour

psi =Pounds/SquareInch,pressurelevel

gpm=Gallons/minuteorFlowrate

F° =Temperature(Fahrenheit)

Buttons

= Boiler power

= Up and down selection

= Scroll option

Hea tin g M ode / Ini tia l S tar t-u p

1. To set in the heating mode press the power button. The indicators will show the current working mode of
the boiler.

2. Set the supply water temperature (SWT) set point. Utilize the right arrow

push button to scroll through

working parameters of the boiler. Highlight the

SWT symbol and utilize the up and down arrows to
select the temperature that meets hydronic radiant heating application. The supply water temperature can be
set between 85° - 140°F. Notice the °F symbol will light up at the same time when changing temperature.

3. If 120 VAC power is connected to the circulating pump, turn control panel on

and utilize push buttons to
scroll to psi indicator. Disconnect thermostat wiring connection below control panel. This will insure boiler will
not operate. If pressure is below the 7 psi level the circulating pump indicator will blink. Verify pressure (psi)
reading on control panel to achieve desired pressure levels. Typical pressure readings should be slightly above
the 12 psi expansion tank reading or higher depending on application (15-20 psi recommended).

4. For testing, turn the thermostat above the room temperature reading. This will turn the boiler on. After testing
return the thermostat to a comfort setting.

5. To automatically return to main viewing mode momentarily press the power

button. The controller will switch

over to the main view if you don’t push any of the buttons for 1 minute.

FAILURES INDICATION

INDICATOR STATUS DETAILS

EEE Message
on electronic
display

Data record error

Parameter out of range or a failed temperature sensor

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Wi nte r M ode (H eat ing Mode)

To set in the heating mode press the power button. The indicators will show the current parameters of the
boiler (see control panel).

MAIN VIEW

INDICATOR STATUS DETAILS

Heating Status

on

Thermostat is calling for heat

off

Room set temperature has been reached/ no call for heating

blinks

Off Peak load control or master appliance mode.
Outdoor temperature reached a thermal cut - off valve (see parameter 5 in advanced settings).

Circulating Pump Indicator

on

Pump is active, proper ow rate of water has been reached

blinks

Lack of water ow or insufcient ow of water heating elements off

Supply Water Temperature

red light

Boiler is in heating mode

green light

Supply water temperature has been reached in the boiler

off

Heating is off

Outlet Temperature

°F

Temperature on the outlet of the boiler

In st ru ct io ns f or t he u se r

SUPPLY WATER TEMPERATURE VIEW

INDICATOR DETAILS

°F

The LED in the rst location on the display indicates automatic setting, according to the heating
curve and offset (see parameters 4 and 5 in advanced settings). This is active only when the outdoor
sensor is wired to Text terminals on control panel .

Manual setting (see parameter 4 in advanced settings), outlet temperature can be set manually in
range 85 - 140°F. Use buttons

and to change the parameter

INLET TEMPERATURE VIEW

°F

Inlet temperature

OUTLET TEMPERATURE VIEW

°F

Outlet temperature

FLOW VIEW

gpm

Flow rate [gallons/min.]

PRESSURE VIEW

psi

Pressure level [pounds/square inch]

ENERGY CONSUMPTION VIEW

X100 BTU/h

Current energy consumption [BTU/h]

OUTDOOR TEMPERATURE VIEW

°F

Outdoor temperature. In case of lack of outdoor temperature sensor, preview is not available

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In st ru ct io ns f or t he u se r

MODE VIEW

INDICATOR DETAILS

The control panel is off and the stand-by mode indicator (dot) blinks only .

PRESSURE VIEW

psi

Pressure level [pounds/square inch].

To check out the installation pressure press

or

STATUS PUMP VIEW

Circulation pump is active. In summer mode (heating elements turned off). The circulating pump will
operate for 15 minutes, once every 24 hours each day.

Sum mer Mo de (St and -by Mo de)

Important: Do not shut off the power supply between heating seasons. To set the boiler to summer or stand-by
mode press and hold power button for 3 seconds. When the control panel is switched to summer mode the
control panel is off and the stand-by mode indicator (F) remains blinking. In this mode the boiler is off but the pump
is activated every day for 15 minutes. This summer mode protects the boiler and the hydronic heating installation
from being blocked and silted up. The pump will run every day at the same time when the boiler is switched to
summer mode. For example, if you turn the boiler to “stand-by” mode at 6 p.m. the timer will activate the pump
every day for 15 minutes starting at 6 p.m.

To set the boiler back to winter heating mode press and hold power button

for 3 seconds.

Note- In summer mode, based on U.S. national electric rates of $.10/kWh the cost of operating the circulating
pump for 15 minutes/day will equate to approximate usage of $.08 / month on the highest speed.

To use the outdoor compensation option refer to outdoor compensation graphs on page 14. The outlet temperature
is adjusted depending on the outdoor temperature. For example, if it's cold, the outlet temperature should increase,
but if outdoor temperature is warmer, the outlet temperature should be adjusted lower. Outdoor compensation
option is based on heating curves (see "Advanced Settings").

User can choose from one of the 9 curves available, declaring the desired thermal efciency of the boiler. One
method of selecting the correct curve is as follows. The rst step is to determine the temperature on the horizontal
axis (outside temperature from 0°F to 70°F), which at the present time most frequently occurs, for example 30°F.
Then run in a straight line up to the height on the value of the temperature on the vertical axis which we want to
obtain in the hydronic system. In our example, at 30°F outside the building we want to have 115°F for the heating
(see the diagram on page 14), so we get exactly the heating curve dened as 4. If the intersection point of selected
temperatures is not placed on the curve, we choose the closest. For example, 30°F outdoor temperature, and
the desired 110°F for hydronic system can lead to a selection of curve 3 or 4. It should be checked periodically,
whether the choice was correct, if not - another curve should be used.

The heating curve offset

If in wide range of outdoor temperatures the boiler is not able to maintain the desired indoor temperature (it's too
cold or too warm), the heating curve chosen before should be shifted (offset in range -9°F to +9°F available in
options on control panel). If the indoor temperature is too warm - the heating curve should be shifted down and
vice versa (refer to the diagram on page 14).

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Parameters

Indicator/

display

Status/

value

DETAILS

1

A/n

Working mode of pump – PA = (automatic), Pn (manual – continuous duty of
pump)

2

psi

off/on Installation pressure control

3

°F

30 - 70

Outside temperature above which boiler will not heat, in case of boiler’s
failure or lack of outside temperature sensor, function is not active

off Function not active

4

1 - 9

Selection of heating curves (see diagram “Outdoor compensation”

)

0 Manual setting of outlet temperature

5

-9 ÷ 9

Offset of heating curve characteristic [°F] (see diagram “Offset for outdoor
compensation”)

6

Boiler working time counter in hours

Adv anc ed Set tin gs

For advanced settings switch the control panel to stand-by mode. First press and hold power button for 3

seconds and release. Then press and hold the button, and immediately press the power button

To select parameter press: , , or buttons to enable you to change the values.

Press and hold the power button

to exit and save the settings.

In st ru ct io ns f or t he u se r

1

2

3

4

5

6

7

8

9

Outdoor Temperature [°F]

Boiler Outlet Temperature [°F]

60

80

100

120

140

010203040506070

Outdoor Temperature [°F]

Boiler Outlet Temperature [°F]

60

80

100

120

140

010203040506070

+9°F

-9°F

4

Outdoor compensation Offset for outdoor compensation

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Tr oub les hoo tin g

Symptom Reason Action

All indicators on control panel are
OFF

No power to boiler

Check for 240 VAC on boiler main connection terminals

Reset manual safety high limit

Contact authorized service person

“PSI” indicator blinks

Insufcient pressure below 7 psi

Switch the controller to pressure view and increase system
pressure above the minimum required 7 psi level.

Pressure sensor failure

Switch the controller to pressure view, if display shows - ­Contact authorized service person

“GPM” indicator blinks

Pump is blocked

Unblock the pump-unscrew the screw on pump housing and
move the pump rotor manually

Heat does not circulate through the boiler
– boiler is blocked

Air bubble is caught in system, purge the installation, pump
and boiler

Check 1 amp fuse on control panel

Failure of pump or ow sensor

Check power supply for circulating pump

a failure of pump or ow sensor

Contact an authorized service or the seller

Circulator indicator blinks

Lack of water ow - 2.1 GPM min

Adjust ow characteristics as needed

“Heating status” is off

No thermostat connection

Insure thermostat is calling for heat and is above ambient
temperature set point

Verify connections on thermostat

Failure of control board Check fuse on control panel glass fuse 6,3 x 32mm 2A

“Heating status” blinks

Off Peak signal = no heat

Electric utility off peak control

and “Inlet temp.” blinks

A failure of inlet temperature sensor,
boiler in failure condition

Check connection or replace thermistor sensor

and “Outlet temp.” blinks

A failure of outlet temperature sensor
or loose connection

Check connections

Replace HC-DN 15 sensor

Boiler does not heat

Failure of cylinder temperature sensor

Contact authorized service person for replacement of
cylinder temperature sensor or thermostat

A failure of control panel Contact authorized service person

EEE message on display Data record error Contact authorized service person

Insufcient heat output

Heating elements Check for resistance on elements

Control panel set up failure

Insure control panel is set up for correct kW and number of
heating elements through advanced settings

!

Do not attempt to service this boiler unless you have been trained in all aspects of its functionality

and methods to repair. Failure to service properly may lead to further damage to components.

1. In order to protect ow sensor located within the boiler, it is imperative that the pre-installed magnetic lter is
removed and cleaned at least annually. Failure to clean out this lter could increase contamination of the boiler
by system residue.

2. Periodically check system pressure. Contact authorized service person to make adjustments only.

Care and Maintenance

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General Boiler View

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L1 L2

1. Wiring Entrance 7. Manual Reset High Limit Device

2. Control Panel 8. Heating Element

3. Pump 9. Flow and Outlet Temperature Sensor

4. Pressure Relief Valve 10. By-Pass Valve

5. Pressure Sensor 11. Water Inlet

6. Magnetic Filter 12 Water Outlet

Part List

In st ru ct io ns f or t he u se r

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Part # Description

01563 Side Cover

01564 Outdoor Temperature Sensor

01591 Heat Exchanger - 4 kW/240V

01565 Heat Exchanger - 6 kW/240V

01566 Heat Exchanger - 8 kW/240V

01567 Heat Exchanger -12 kW/240V

01568 Heat Exchanger -14.4kW/240V

01569 Inlet Connection Pipe

01570 Pump Pipe EKCO.LN2UL

01571 Power Board ZM-60 (w/o pipe)

01572 Inner Pipe of Power Board

01573 Outlet Connection Pipe 1

01574 Outlet Connection Pipe 2

01575 Safety Valve Pipe

01576 Control Panel -Main Circuit Board

01577 Case

01578 Nipple 3/4”

01579 Nut

01580 Nut G 3/4”

01581 Connection

01582 Sleeve

01583 Panel ZIO.50

01584 Pump Wilo Star S21 U15 130 PR3

01585 Apollo Safety Relief Valve 30 psi, 3/4”

01586 Thermal Safety Cut Out 60T-X25, 90.05 Thermodisc

01587 Contactor HVVY2XQ04GG Hartland

01588 Transformer 4000-09AW18AE999

01589 Glass Fuse Connection 16A

01590 Time-delay Glass Fuse 6.3 x 32mm 2A

01592 Connector VC05-0046

01593 Holder KU-2 color Grey

01594 Thermal Cut Out (auto reset) 36T

01601 Return Temperature Sensor NTC

01294 Magentic Filter F-Mag 3/4

01195 Differential Pressure Relief Valve

00853 Expansion Vessel

01339 Flow Sensor Huba Control

NextGen Boiler Parts

B O I L E R

TM

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Limited Product Warranty

Kospel, S.A. warrants, and WH Response LLC carries out, the NextGen Boiler to the original purchaser to be free
from manufacturing defects in materials and workmanship at the location of the original installation, except as noted
below, for a period of 26 months from the date of manufacture. The NextGen Boiler must have been purchased
from an authorized NextGen Boiler distributor. A Return Materials Authorization (RMA) form must be completed
in full and returned along with the defective component(s), freight pre-paid.

Special labor allowance

If any component or parts fail due to manufacturing defects within the rst ninety days (90) of installation and the
repair is diagnosed by a licensed contractor, reimbursement of reasonable labor cost can be requested through
WH Response LLC. Request for labor allowance must be completed on an RMA form. A copy of the original
installation invoice and a written record showing the date of service from a licensed contractor must be provided.

This warranty does not cover normal maintenance, transportation, installation or labor charges for the replacement
part or components (except for special allowances, as noted above) or any other service calls or labor repairs.

Exclusions or conditions that void warranty

1. Applications and installations that are in violation of state and/or federal codes or statutes.

2. Products that have been altered, replaced or repaired from original factory condition.

3. Damages from improper voltages or power supply wiring or voltage transients or spikes.

4. Damages due to natural disaster.

5. Component damage due to freezing or water quality conditions.

6. Incorrect application use other than intended as noted above.

7. Incorrect product sizing for the application.

8. Boilers not installed according to manufacturer’s specications and installation instructions as noted in the
product installation manual.

9. Products that have internal wiring or parts altered or removed, bypassing of safety circuits, modications of
parts or circuit boards or mechanical water ow changes not authorized in writing by the manufacturer.

10. Unusual wear and tear of the product.

11. The name plate decal and the UL certication label (including serial number) are (either) defaced or destroyed.

12. Damages resulting in shipment or handling by the freight carrier. It is the receiver’s responsibility to claim and
process freight damage caused by others.

Replacement parts under this limited warranty do not extend the warranty term or period.

Kospel, S.A. and WH Response LLC are not bound by representatives, installers, warranties or promises made by
others beyond the terms of this limited warranty. In no way shall Kospel, S.A. or WH Response LLC be responsible
for any installation, incidental or consequential damage.

Kospel, S.A. and WH Response LLC (or an authorized representative from either) has the right to inspect any
reported defective products and/or parts. Materials are to be returned at owner’s expense.

This warranty gives you specic legal rights, and you may also have other rights which vary from states to state.

B O I L E R

TM

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NextGen Boiler Warranty Registration

Name____________________________________________________________________________________

Address___________________________________________________________________________________

City_______________________State___________________Zip code_________________________________

Telephone_________________________________________________________________________________

Model #___________________________Serial #__________________________________________________

Installer Name__________________________________Telephone___________________________________

Date Installed______________________________________________________________________________

Warranty registration must be lled out completely and mailed or emailed within Sixty (60) days of installation in
order to gain warranty coverage.

Warranty Registration

WH Response LLC

NextGen Boiler Warranty Registration

6800 Electric Drive

Rockford, MN 55373

Fax: [phone] or by Email: [e-mail]

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