ThermoFlow Elex 8.5, Elex 12, Elex 15, Elex 18, Elex 21 Installation Manual, User Manual, And Warranty Information

TM

Electrically Controlled Tankless Water Heater

Installa�on

uide, ser anual, and Warranty nforma�on

Electrically

Controlled

Tankless Water

Heater

Elex 8.5 / Elex 12 /

Elex 15 / Elex 18 /

Elex 21 / Elex 24

TM

Contents

Use of the manual

Mounting instructions

User manual

Maintenance

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...............................................................................

Trouble shooting

Warranty conditions

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3

5

19

21

22

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Use of the manual

Congratulations and thank you for choosing our instant water heater.
The instruction contains important information about commissioning,
switching the device on and maintenance. To ensure your safety and
that of others we recommend you read through this safety manual care­fully. Please refer to the back of the manual for details about thewarran­ty. Keep this manual for future reference.

If you lose the maunal, contact your local distributor or manufacturer.
When you call, please tell us the model number and the serial number of
your unit written on the rating plate of the water heater.

Symbols used in this maunal

The following symbols are used in this maunal and on the appliance:

Fail to observe this instruction may expose you or others to danger.
Fail to observe this instruction may lead to damage to the device.

Indicates live parts.
Fail to observe this insturction may lead to damage to the device or damage
or others.

Please read the manual

Hazardous materials and waste electrical and electronic equipment
should be taken to a designated recycling location.

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Use of the manual

This appliance can be used by children aged from 8 years and above
and persons with reduced physical, sensory or mental capabilities if
they are supervised during use of the appliance and under stand the
hazards involved.

This is not a toy. Children shall not play with this appliance.

Standards and regulations

The installation (plumbing and electrical work), commissioning and
maintenance of this appliance should only be undertaken by person­nel with electrical qualifications and in accordance with the relevant
standards and codes and this manual.

Correct and reliable operation of this unit will only be ensured if the
original accessories and spare parts are used.

The following should also be observed:
the appliance name plate;
the technical specifications.

Connection to the water supply

Compatible cold water pipe material: steel, copper and plastic.
There is no need to install a relife valve.
Compatible hot water pipe material: copper, approved plastic piping
systems.

Electrical installation

This unit may only be connected to a fixed cable.
This appliance must be connected to a dedicated breaker.

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Mounting instructions

Contents

1 device (Elex 8.5 / Elex 12)

1 mounting template
1 bag of installation materials, contects:

 1 filter mat
 4 spacers
 1 gasket
 4 screws
 4 anchors











Contents

1 device (Elex 15 / Elex 18 / Elex 21 / Elex 24)

1 mounting template
1 bag of installation materials, contects:

① 1 inlet connector kit (combined with filter mat)
② 1 outlet connector
③ 2 gaskets

④
⑤
⑥

4 spacers
4 anchors

4 screws













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Mounting instructions

Unpacking

Check if the device has been damaged in any way.

Environment

To prevent damage during transport this unit is shipped in sturdy
packing. Please recycle the packaging where possible.

Disposal of the appliance

Old appliances must not be disposed of in your household waste!
Please bring old appliances to the appropriate recycling center nearest to
you.

Tools

You will require the following tools for installation:

• Phillips-head screwdriver

• Open-ended wrenches

• Teflon tape

• Drill

• Stone or concrete drilling bits

• Pencil

• Adhesive tape

• Wire strippers

All the devices require a single phase 220-240V supply .
If the electrical installation does not meet these requirements then it will
need to be modified. This should be done by a qualitied electrician in
accordance with the relevant regulations (IEC, NEC, etc.)

Preparing for installation

The water and electrical supply need to be available at the place where
the device is to be supplied. If the electricity cable is buried in the wall then
use the supplied spacers. If the electrical cable is fixed to the wall then the
device can also be fixed straight to the wall.

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Mounting instructions

Elex 8.5 / Elex 12

A1. A2.

2

1

Display plug

A3. A4.

Input electric cable

5/16”

Connection to wall

MOUNTING TEMPLATE

4”

Minimum distance to the ceiling

Mindestabstand zur Decke

Mindestabstand zur Wand

Mindestabstand zur Wand

4”

Minimum distance from wall

Minimum distance from wall

Mindestabstand zum Boden

5/16”

Connection to wall

Warm water connection Cold water connection

Minimum distance to the ground

8”

Electric tankless Water heater - Installation Maunal and User Guide

Connection to wallConnection to wall

5/16”

4”

5/16”

07

TM

Mounting instructions

A5. A6.

max. 1”

08

A7.

A8.

6”

1”

Electric Tankless Water heater - Installation Maunal and User Guide

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Mounting instructions

A9. A10

L1 L2

A11.

Push the button

to reset the switch

2

3

1

Display plug

outlet

Electric tankless Water heater - Installation Maunal and User Guide

gasket

filter mat

inlet

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Mounting instructions

Elex 15 / Elex 18 / Elex 21 / Elex 24

B1. B2.

2

1

B3. B4.

1

Gasket

Inlet Connector

2

Gasket

Outlet Connector

2

Display plug

5/16” mm

Connection to wall Connection to wall

MOUNTING TEMPLATE

Minimum distance from wall Minimum distance from wall

5/16” mm 5/16” mm

Warm water connection Cold water connection

5/16” mm

4”

Minimum distance to the ceiling

4” mm

Input electric cable

4” mm

Screws, washers and anchors

8”

Minimum distance to the ground

1

4” mm

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Mounting instructions

B5. B6.

4”

2”

pipe wall

pipe wall

Max 18 Nm

Don’t over-tighten the connections!
Use a spanner!

Arrow on the inlet connector
must be installed outward
from the wall!

B7. B8.

max. 1”

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Mounting instructions

B9.

B11.

B10.

6”

1”

L1 L2L1L2

Push the button

to reset the switch

B12.

2

12

Display plug

3

1

outlet

Electric Tankless Water heater - Installation Maunal and User Guide

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inlet

Mounting instructions

The appliance must be earthed properly!
The filter mat contained in accessory bag must be installed
when connecting with inlet(cold) water pipe or hose!
Circuit breaker must be installed with the appliance, please
take page.15 to 17 for the selection of circuit breaker.

See image A1, A2

Remove the screw with a philips-head screwdriver and open the top
cover. Remove the display plug and remove the top cover and put
aside.

See image A3, A4

1. Use two pieces of tape to fix the template on the wall where the device
is to be installed.

2. Drill four 5/16” holes through the template, as indicated in A4.

See image A5, A6, A7, A8, A9

1. Insert the anchors into the holes drilled at last step.

2. Install the appliance with the supplied screws and spacers.

3. Install the hot water pipe to the left, and install the cold water supply
to the right. Make sure the connections are watertight! To prepare the
connection to the water supply, Teflon tape must be used for sealing the
threads.

4. Cut the cable to the required length and connect it to the terminal
block, press the button to reset the switch, as A8 and A9 shown.

The electrical connection should be made by a qualitied electrician, in
accordance with the relevant regulations (IEC, NEC, etc.)

This appliance must be earthed properly!
Circuit breaker must be installed!

See image A10, A11

1. Insert the display plug.

2. Install the top of the housing.

3. Insert the screw at the bottom.

4. Switch on the circuit breaker, turn on the appliance and open the
hot water tap, wait for about 20 secs before the appliance start work­ing.

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Mounting instructions

See image B1, B2

Remove the screw with a philips-head screwdriver and open the top
cover. Remove the display plug and remove the top cover and put
beside.

See image B3

Install the supplied plumbing components as illustrated. The filter mat

must be installed on the inlet of the appliance.

See image B4, B5

1. Use two pieces of tape to fix the template on the wall where the device
is to be installed.

2. Drill four 5/16” holes through the template, as indicated in B4.

3. Install cold water inlet connecter and filter mat to cold water supply (in
the wall) on the right, and hot water outlet connecter to hot water supply
(in the wall) on the left, as shown in B5. Teflon tape must be used for
sealing the threads. Make sure the arrow on the inlet connector outward

from the wall.

See image B6, B7, B8, B9, B10

1. Insert the anchors into the holes drilled at last step.

2. Install the appliance with the supplied screws and spacers.

3. Install the hot water pipe to the left, and install the cold water supply
to the right. Make sure the connections are watertight! To prepare the
connection to the water supply, Teflon tape must be used for sealing the
threads.

4. Cut the cable to the required length and connect it to the terminal
block, press the button to reset the switch, as B9 and B10 shown.

The electrical connection should be made by a qualitied electrician, in
accordance with the relevant regulations (IEC, NEC, etc.)

This appliance must be earthed properly!
Circuit breaker must be installed!

See image B11, B12

1. Insert the display plug.

2. Install the top of the housing.

3. Insert the screw at the bottom.

4. Switch on the circuit breaker, turn on the appliance and open the
hot water tap, wait for about 20 secs before the appliance start work­ing.

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Mounting instructions

Commissioning

• Fill the device and vent it by opening a hot water tap connected to it.

• Only switch on the electrical supply once the device is clear of any
air.

• Check the operation of the device.

Frost

This device should be installed in a climate-controlled location,
protected from freezing temperatures.

Technical specifications

Instant water heater model

Electric supply

Nominal power rating
Nominal current

Circuit Breaker

Flow rate (∆t=45°F)

Flow rate (∆t=65°F)

Cable size
Temperature range

Switch on flow rate

Non-usage consumption

Protection class
Type of protection

Unit Dimensions

Unit weight

Water connections
Max. pressure water mains

Switch on flow pressure

Elex 8.5

220-240V 50/60Hz

8.5 kW
35-39 A

2-POLE 40A 2-POLE 60A

1.3 GPM

0.9 GPM

10 AWG
104-140 °F

0.58 GPM

<1 Wh/h

I

IP 24

13¾ x 7⅞ x 4¾''

5.4 lb

1/2’’ NPT
115 PSI

15 PSI

Elex 12

220-240V 50/60Hz

12 kW
50-55 A

1.8 GPM

1.3 GPM

8 AWG
104-140 °F

0.58 GPM

<1 Wh/h

I

IP 24

13¾ x 7⅞ x 4¾''

5.4 lb

1/2’’ NPT
115 PSI

15 PSI

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Mounting instructions

Technical specifications

ThermoflowTM model

Electric supply

Nominal power rating

Nominal current

Circuit Breaker
Flow rate (∆t=45°F)

Flow rate (∆t=65°F)

Cable size
Temperature range

Switch on flow rate

Non-usage consumption

Protection class

Type of protection

Unit Dimensions

Unit weight

Water connections
Max. pressure water mains

Switch on flow pressure

Elex 15

220-240V 50/60Hz

15 kW

2 x 32 A

2 x 2-POLE 40A

2.3 GPM

1.6 GPM

2 x 10 AWG
104 - 140 °F

0.66 GPM

<1 Wh/h

I

IP 24

18¾ x 10⅛ x 4⅞''

8.4 lb

1/2’’ NPT
115 PSI

15 PSI

Elex 18

220-240V 50/60Hz

18 kW

2 x 38 A

2 x 2-POLE 50A

2.7 GPM

1.9 GPM

2 x 10 AWG
104 - 140 °F

0.66 GPM

<1 Wh/h

I

IP 24

18¾ x 10⅛ x 4⅞''

8.4 lb

1/2’’ NPT
115 PSI

15 PSI

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Electric tankless water heater - Installation Maunal and User Guide

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05

Mounting instructions

Technical specifications

ThermoflowTM model

Electric supply

Nominal power rating

Nominal current
Circuit Breaker

Flow rate (∆t=45°F)

Flow rate (∆t=65°F)

Cable size
Temperature range

Switch on flow rate

Non-usage consumption

Protection class
Type of protection

Unit Dimensions

Unit weight

Water connections
Max. pressure water mains

Switch on flow pressure

Elex 21

220-240V 50/60Hz

21 kW

2 x 44 A
2 x 2-POLE 50A

3.1 GPM

2.2 GPM

2 x 10 AWG
104 - 140 °F

0.66 GPM

<1 Wh/h

I

IP 24

18¾ x 10⅛ x 4⅞''

8.4 lb

1/2’’ NPT
115 PSI

15 PSI

Elex 24

220-240V 50/60Hz

24 kW

2 x 50 A
2 x 2-POLE 60A

3.6 GPM

2.6 GPM

2 x 8 AWG
104 - 140 °F

0.66 GPM

<1 Wh/h

I

IP 24

18¾ x 10⅛ x 4⅞''

8.4 lb

1/2’’ NPT
115 PSI

15 PSI

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Mounting instructions

Temperature Rise vs. Flow Rate at 240V

Note: Temperature rise = Hot Water Temp. - Cold Water Temp.

Elex 18

Elex 24

Elex 21

Elex 15

Elex 12

Flow Rate GMP

18

Elex 8.5

Temperature Rise vs. Flow Rate at 240V

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

Electric tankless water heater - Installation Maunal and User Guide

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Temperature Rise F

User manual

Operation

The integrated flow control valve accommodates changes in water
pressure and thus maintains a fairly constant temperature.

Commissioning

If the selected outflow temperature is not reached when the tap is fully
opened, then the water flow through the device exceeds the capacity
of the device (ThermoflowTM Elex 8.5/12/15/18/21/24). In this case, the
flow should be reduced with the hot water valve. There is a danger of
scalding at outflow temperatures exceeding 108°F.

This unit is intended for use with shower heads with a low pressure loss.
Mixer taps and thermostatic mixer taps should be of a design compati­ble with devices with flow control.
Fittings for vented systems should not be used!

Suggestion: To ensure that the minimum flow (switch-on flow) of a water­pressure operated device is reached, the pressure loss (head loss) of the
device, fittings, shower head, shower hose and piping should all be
considered when installing the device.

Typical pressure losses at a water flow of approx. 2.6 GPM:

• Mixer tap: 5.8 - 11.6 PSI

• Thermostatic mixer tap: 4.4 - 7.3 PSI

• Shower head: 4.4 - 21.8 PSI

The electronically regulated continuous-flow water heater with automat­ic tempera
This takes place regardless of the feed temperature, up to the
temperature limit.

The device has push-buttons to switch it on and off, and arrow keys to
adjust the heat ing. Blue: decrease heating performance, red: increase
heating performance.

ture adjustment keeps the outflow temperature constant.

Adjust the temperature settings as desired.

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User manual

Without a temperature limiter, high temperatures may be reached at usage
points. Keep children away from the usage points.
Danger of scalding!

The device should be isolated from the electric supply before any work is
done on live components.

Disconnect this appliance from the power source in a safe way.

The main water valve should be closed before any work is done on the
water pipe.
If the water supply is interrupted, e.g. due to maintenance on the main
water supply, then the following steps should be undertaken before return­ing the device to operation:

1. Turn off power to device.

2. Open a hot water valve connected to the device until the air is vented
from both the device and the cold water supply pipe.

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Maintenance

Maintenance

This device does not require any maintenance by the user. Professional
maintenance may only be carried out by authorized technical staff.
Maintenance, e.g. verifying electrical safety, should only be undertaken
by a qualified electrician, observing the relevant regulations (IEC, UL,
etc.).

If faulty, please take follow the trouble shooting in page.22 to make
the diagnosis. If still have problem, never try to repair the hot water
device yourself, please contact the nearest service specialist for
help.

Care

The enclosure can simply be cleaned with a damp cloth. Do not use
harsh chemicals or abrasives!

Descaling

A service inspection should be performed by authorized and qualified
technical staff every year. Descaling of the device during this inspection
is highly recommended, especially when you live in an area with hard
water exceeding 12 dH. Higher water temperature will intensify calcifica­tion. It is therefore recommended to set the device at maximum
131°F(55°C).

Legionella prevention

Do not use heater water as drinking water.
After prolonged shutdown of the device, for example while on vaca­tion, the device should be fully heated up to the maximum tempera­ture (tap at minimum flow) before resuing. It is recommended to flush
the pipes for one minute.

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Trouble shooting

First aid

• Check the fuses / breakers.

• Check if any fittings or shower head are affected by the build-up of
limescale or dirt.

• See also “Troubleshooting”.

Troubleshooting

Problem Cause Solution

Water heater is not heating at
all (water is flowing but the
unit is not heating - the

outgoing water temperature
is the same as the cold water

supply) - the digital display
does NOT light up.

Water heater is not heating at
all (water is flowing but the

unit is not heating - the
outgoing water temperature

is the same as the cold water
supply) The digital display

DOES light up.

No power or
incorrect wiring.

Flow rate is too
low / water

pressure is too
low.

The air bubbles in
the water heater

have not been
purged out.

Make sure the breakers at main
electrical panel are ON. You may

have a faulty breaker or unit may
be wired in correctly.

Your water heater has an
activation flow rate of

approximately 0.6 GPM (2.5
LPM). If your water flow rate is

less than this level, your unit will
not activate. Increase th e flow

rate or check the filter m

the inlet connector.

Make sure the breakers at main
electrical panel are ON, turn on

the unit and open the hot water
tap for about 20 s.

at inside

Water heater is not heating at
all. The LCD display shows

“E2”

Flow rate is too low

22

Internal part
failure

Something was
blocked in the

filter mat / Pipe
was blocked

Electric tankless water heater - Installation Maunal and User Guide

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Please call for your local service.

Check and clean the filter mat
inside the inlet connector.

Trouble shooting

Troubleshooting

Problem Cause Solution

User temperature
setting too low.

Flow rate is too
high.

Crossed wires.

Water heater is heating, but
the water temperature is
not hot enough.

Voltage less than
240 volts.

Mixing too much
cold water.

Increase the temperature setting on
the unit.

Depending on your incoming water
temperature and the kW of your
heater, your water flow rate may
exceed the physical heating
capacity of your water heater.
Reduce the flow rate by installing a
Flow Regulator.

If it’s a new installation, have your
electrician double check the wiring.
Is possible that the wiring is
incorrect.

The heating elements on your water
heater are design for 240 volts.
When used with a lower voltage,
they produce less heating power.
You may need to upgrade to a
larger input heater.

You do not need to mix as much
cold water with your tankless water
heater compared to when you use a
conventional water heater. You may
also have an anti-scald feature on
your faucet that is mixing cold
water. These types of faucets can
usually be adjusted to reduce the
amount of cold water mixed.

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Trouble shooting

Troubleshooting

Problem Cause Solution

Your faucet may have an anti-scald
feature or a tempering valve that
automatically mixes cold water

Anti-Scald
pressure/balancing
valve or tempering
valve.

The water temperature at
the faucet is less or greater
than the temperature
setting of my water heater.

Thermal loss due
to long pipe run

Water temperature
at the faucet is too
hot

even when you turn your control
lever or handle to full hot. These
devices are usually adjustable so
you can turn off the cold mix
completely.
for this by increasing the setting on
your water heater if you need/want
hotter water.
As the hot water from the heater
runs through the hot water delivery
system to your faucet, some heat
will be lost especially if it has long
distance to travel or the pipes are
cold. This is normal. You can
compensate for this by increasing
the setting on your water heater if
you need/want hotter water.

Check your flow for too little flow,
set point temperature is too high.

You ca

n compensate

If the appliance still fails to operate after you have exectued this procedure,
please inform customer service.

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Warranty conditions

Warranty

Entitlement

Content

Claims

The rights under this manufacturer’s warranty shall apply in
addition to the buyer’s statutory rights. This warranty shall
in no way restrict the buyer’s statutory rights in particularly
towards the seller.

The claiming of rights under this warranty shall be subject
to the submission of the respective proof of purchase.

We shall guarantee as the manufacturer that this product is
free of material and manufacturing errors. Material and
manufacturing errors arising during the warranty period
shall justify the rights under the warranty. This warranty
shall not cover errors due to improper installation or incor­rect usage, incorrect operating conditions or defective main­tenance or repair work.

Normal wear and tear such as lime scaling shall also be
excluded under this warranty. The warranty will not be valid
if the problem is caused by extreme values of drinking water
(pH value not between 7 and 9.5 and/or Cl above 150 mg/l
and/or Fe above 0.2mg/l).

The warranty shall be valid for 24 months. The warranty
period shall commence on the day on which the product is
purchased. Warranty services provided shall neither prolong
the warranty period nor initiate a new warranty period.

Invalidity of
warranty

Restriction

Electric tankless water heater - Installation Maunal and User Guide

Attempted repairs carried out by a customer or third party
that are not authorized by us shall invalidate the warranty.
The same shall apply if parts are installed in the product or
connected to the product that are not original parts from us.

This warranty shall be restricted to rectification and subse­quent delivery. This warranty shall not include compensa­tion, withdrawal from the agreement, reduction in price or
any reimbursement for consequential loss due to defects.

The statutory provisions and delivery conditions of the
national company or importers must be observed.

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Elex 8.5 / 12 / 15 / 18 / 21 / 24

REV2.1 NA 201901

TM