Thermann TH26ENG5N User manual

OWNER’S
GUIDE
Gas Continuous Flow Water Heaters
Owner’s information
Warranty
GISI086
FB9M001
Rev. 05/21
Models
TH26ENG5N
TH26ENG5L
TH26ENG6N
TH26ENG6L
TH21ENB5N
TH21ENB5L
TH21ENB6N
TH21ENB6L
TH17ENB5N
TH17ENB5L
TH17ENB6N
TH17ENB6L

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
2
Thank you for purchasing this THERMANN Gas Water Heater.
Before using, please:
Read this manual completely for operating instructions.
Confirm warranty and proof of purchase.
Keep this manual where it can be found whenever necessary.
Installation must conform with Plumbing Code of Australia (PCA) and local codes or in the absence of local
codes, AS/NZS 5601, AS/NZS 3500.4, AS/NZS 3000 wiring regulations and all Local Building, Water and Gas fitting
regulations.
Reece reserves the right to discontinue, or change at any time, the designs and/or specifications of its products
without notice.
* Note: This appliance requires a minimum flow rate to operate of 1.5-2.5 litres/min., water fixtures with a flow
rate of 7.5 litres/min. or higher are recommended.
For optimum performance we recommend installation of THERMANN optional temperature controllers.
FOR CONTINUED SAFETY OF THIS APPLIANCE IT MUST BE INSTALLED, OPERATED AND MAINTAINED IN
ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS.
WARNING

3
• Do not store or use petrol or other flammable vapours and liquids in the vicinity of this or any other
appliance.
• WHAT TO DO IF YOU SMELL GAS
- Do not try to light the appliance.
- Do not touch any electrical switches; Do not use electrical appliances, including the phone in the
vicinity of the gas smell.
• DO NOT SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.
• DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE.
• DO NOT MODIFY THIS APPLIANCE.
• 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.
• To prevent injury or death, do not allow small children to bathe or play in the bathroom unsupervised.
• This appliance is not suitable for use as a pool heater.
• DO NOT USE OR STORE FLAMMABLE MATERIALS IN OR NEAR THIS APPLIANCE.
• Installation and service must be performed by a qualified installer, service agency or the gas supplier.
If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or death.
WARNING
To prevent damage to property and injury to the user, the icons shown below will be used to warn of varying
levels of danger.
Every indication is critical to the safe operation of the Water Heater and must be understood and observed.
Potential dangers from accidents during installation and use are divided into the following four categories.
Closely observe these warnings; they are critical to your safety.
Icons warning of risk level
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to avoid possible injury or death.
DANGER Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING
I ndicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury
NOTICE Indicates a potentially hazardous situation which, if not avoided, may result in
property damage.
Important Safety Information

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
4
Vapours from flammable liquids will explode
and catch fire causing death or severe burns.
Do not use or store flammable products such
as petrol, solvents or adhesives in the same
room or area near the Water Heater.
Keep flammable products:
1. Far away from the Water Heater.
2. In approved containers.
3. Tightly closed.
4. Out of children’s reach.
Vapours:
1. Cannot be seen.
2. Vapours are heavier than air.
3. Go a long way on the floor.
4. Can be carried from other rooms to the
main burner by air currents.
DANGER
Flammable Vapours
When a gas leak is noticed:
1. Stop use immediately.
2. Close the gas valve.
3. Contact your gas supplier immediately.
If you detect abnormal combustion or
abnormal odours, or during an earthquake,
tornado or fire:
1. Turn off the hot water supply.
2. Turn off the power to the Water Heater.
3. Turn off gas and water supply valves.
4. Call Customer Service on 1300 412 612
(in Australia) or contact your local Reece
branch (in New Zealand).
Check the temperature of the running hot
water before entering the shower.
Check the temperature before stepping into
the bath.
WARNING
WARNING
Hot Water Heater temperatures over 50°C
can cause severe burns instantly or death
from scalding.
Children, disabled and elderly are at the
highest risk of being scalded. Feel water
temperature before bathing or showering.
Temperature limiting valves are available, ask
licensed installer.
Do Not Install Indoors.
This will cause carbon monoxide poisoning
and a potential fire hazard.
A. This Water Heater does not have a pilot.
It is equipped with an ignition device that
automatically lights the burner. Do not
try to light the burner by hand.
B. BEFORE OPERATING smell all around the
Water Heater area for evidence of leaking
gas. Be sure to smell next to the floor
because some gas is heavier than air and
will settle on the floor.
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.
Follow the gas supplier’s instructions.
C. Use only your hand to turn the gas valve
knob. Never use tools. If the knob will
not turn by hand, don’t try to repair it.
Call a qualified service technician. Force
or attempted repair may result in a fire or
explosion.
D. Do not use this Water Heater if any part
has been under water. lmmediately call
a qualified service technician to inspect
the Water Heater and to replace any
damaged parts.

5
To prevent burns or scalding, turn off
the Operation button and wait until
the appliance cools before performing
maintenance.
Do not install this Water Heater in a mobile
home, recreational vehicle or on a boat as
this may be a Carbon Monoxide Poisoning
Hazard.
Leave the proper clearance between the
Water Heater and nearby objects (trees,
timber, boxes with flammable materials,
etc.).
Do not place combustibles such as laundry,
newspapers, oils etc. near the Water Heater.
Do not use combustible chemicals such
as oil, petrol, benzene etc. in the near the
Water Heater or the exhaust vent.
Do not store or use petrol or other
flammable vapours and liquids in the vicinity
of this or any other appliance.
Do not place or use a spray can near the
Water Heater or the exhaust vent.
Do not place the Water Heater in an indoor
environment by means of adding walls and
ceiling (Do not enclose using corrugated
sheets, etc.).
Carbon monoxide poisoning or fire may occur
as a result.
Do not use hair spray or spray detergent in
the vicinity of the Water Heater.
Upper:
Min. 500 mm
Right side:
Min.
500 mm
Left side:
Min.
500 mm
Front:
Sug. 600 mm
Check that the data plate.
Installation and service must be performed
by a qualified installer, service agency or the
gas supplier.
Do not install in locations where excessive
dust or debris will be in the air.
To prevent injury or death, do not allow
small children to bathe or play in the
bathroom unsupervised.
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.
Do not touch the power cord with
wet hands.
Contact a qualified service technician for any
necessary repairs, service or maintenance.
Do not use parts other than those specified
for this appliance.
xx
xxxxxxxx
xx
xx xx
xx
(e.g. For Natural Gas)
WARNING

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
6
Do not use a broken or modified power cord.
Do not bind, bend or stretch power cords.
Do not scratch, modify, or subject them
to impact or force. If the supply cord is
damaged, it must be replaced by the
manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
Do not cover the Water Heater, store trash or
debris near it, or in any way block the flow of
fresh air to the appliance.
Do not touch the exhaust vent during or
immediately after operation of the Water
Heater.
Be sure to electrically earth the appliance.
Keep power cord free of dust.
Do not use the Water Heater for other than
hot water supply, shower and bath.
Do not exchange a remote controller cord
without notice.
Do not turn off the Water Heater while
someone is bathing.
CAUTION
If the appliance delivers water in excess of
50°C, the following warning must be adhered
to:
THIS APPLIANCE MAY DELIVER WATER
AT HIGH TEMPERATURE. REFER TO THE
PLUMBING CODE OF AUSTRALIA (PCA),
LOCAL REQUIREMENTS AND INSTALLATION
INSTRUCTIONS TO DETERMINE IF
ADDITIONAL DELIVERY TEMPERATURE
CONTROL IS REQUIRED.
If the appliance is 50°C locked model, the
following statement & warning must be
adhered to:
THIS APPLIANCE DELIVERS WATER NOT
EXCEEDING 50°C IN ACCODRANCE WITH AS
3498.
WARNING — THIS APPLIANCE MUST ONLY
BE INSTALLED IN ACCORDANCE WITH THE
ACCEPTABLE PLUMBING CONFIGURATIONS
SPECIFIED IN THESE INSTRUCTIONS. FAILURE
TO DO SO MAY RESULT IN CONDITIONS
WHERE DELIVERY TEMPERATURE CONTROL
IS INADEQUATE.
WARNING

7
Do not drink water that has been inside the
appliance for an extended period of time. Do
not drink the first use of hot water from the
appliance in the morning.
Clean the filter on the water inlet as
frequently as required. The quality of
your local water will affect the frequency
required.
Treat hard, acidic or otherwise impure supply
water with approved methods to ensure full
warranty coverage.
Problems resulting from scale formation are
not covered by the warranty.
Do not run water through the appliance
when appliance is not on.
When discharging hot water, make sure the
appliance is ON. If water is run through the
appliance with the appliance OFF, water may
condense inside the appliance and cause
incomplete combustion or damage to the
internal electrical components.
Contact Reece before using with a solar
heater.
Power must be switched on at all times for
antifrost protection to work.
If it is snowing, check the air inlet, exhaust
gas vent and exhaust vent terminal for
blockage.
NOTICE Keep the area around the appliance clean.
If boxes, weeds, cobwebs, cockroaches etc. are
in the vicinity of the appliance, damage or fire
can result.
Do not install the appliance where the
exhaust will blow on walls or windows.
Do not disassemble the Remote Controller.
Do not use chlorine-based, acidic, alkaline
detergents, organic solvents such as benzine
and thinner, or Melamine Sponge to clean
the Remote Controller.
This may cause discolouration, deformation,
scratches or cracks.
Do not get the Remote Controller wet.
ECB1T and ECB2T are water resistant, too
much water can cause damage. ECM1T is not
water resistant.
Do not splash water on the Remote
Controller.
Do not expose the Remote Controller to
steam.
Although it is water resistant, too much water
can cause damage.
Do not locate the Remote Controller near
stoves or ovens.
This may cause damage or failure.
Preventing damage from freezing (See page
11)
• Damage can occur from frozen water within
the appliance and pipes even in warm
environments. Be sure to read below for
appropriate measures.
• Repairs for damage caused by freezing are
not covered by the warranty.

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
8
Important Safety Information 3
CONTENTS 8
General 9
Initial Operation 10
Frost Protection 11
Regular Maintenance 12
Troubleshooting 15
Follow-up Service 18
Specifications 19
Maintenance 20
Manufacturer’s Warranty 22
CONTENTS

9
1. Flue Exhaust
2. Front Cover
3. Air Inlet
4. Inlet water filter
Inside Water Inlet (See page 14)
5. Hot Water Pipe
6. Water Supply Valve
7. Gas Supply Valve
8. External Weatherproof Power Point
9. (TH26ENG series only) Status Display
Indicate the status of Water Heater or error codes.
When water heater is initially
plugged into power, set
temperature is displayed for
approx. thirty seconds.
On
When water is flowing, the bar
rotates clockwise.
When the gas burner is on, three
dots are displayed.
When the gas burner is on, set
temperature is displayed for a
minute and then “on” is displayed.
If an error has occurred, a blinking
error code is displayed.
If the bar rotates slowly
while blinking, that
means that water flow
rate is insufficient to
turn on the burner.
This illustration shows an example of installation.
The exact installation configuration may be slightly
different.
General
NOTE (For TH26ENG series)
When using without remote
controller, check the set temperature
shown on the Status Display before
use.
(e.g. TH26ENG5N)
1
2
5
4
3
9
6
7
8

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
10
Before start using for the first time, do the
following:
Initial Operation
4. Turn on the power.
1. Open the water supply valve.
3. Open the gas supply valve.
2. Open a hot water fixture to confirm that water
is available, and then close the fixture again.
*When the remote controller is installed,
the temperature can not be adjusted above
“43°C” while hot water is flowing. See
Remote Controller Owner’s Manual- Setting
and Using the Water Heater.
Hot water
fixture

11
Frost Protection
* Outside temperature including wind chill factor
less than-15°C.
Freezing cannot be prevented when the power plug
is unplugged. Do not remove the power plug from
the wall outlet.
Freezing will be prevented regardless of whether
the Operation button is ON or OFF.
The freeze prevention heaters will not prevent
the plumbing external to the Water Heater from
freezing. Protect this plumbing with insulation, heat
tape or electric heaters, solenoids, or pipe covers.
• Damage can occur from frozen water within
the appliance and pipes even in warm
environments. Be sure to read below for
appropriate measures.
• Repairs for damage caused by freezing are not
covered by the warranty.
NOTICE
Freezing is prevented within the
device automatically by the freeze
prevention heater.
This method can protect not only the Water Heater,
but also the water supply, water piping and mixing
valves.
1. Turn off the Operation button.
2. Close the gas supply valve.
3. Open a hot water fixture, and keep a small
stream of hot water running. (400 mL/minute or
about 4 mm thick.)
• If there is a mixing
valve, set it to the
highest level.
4. The flow may become unstable from time to
time. Check the flow 30 minutes later.
• In general, it is not advisable to run water
through the Water Heater when it is OFF (See
page 6), but in this case freeze prevention is
more important.
Take the measures below for
extremely cold temperatures*.
If water will not flow due to freeze
1. Close the gas and water valves.
2. Turn off the Operation button.
3. Open the water supply valve occasionally to
check whether water is running.
4. When the water is flowing again, check for
water leaks from the Water Heater and piping
before using.
NOTE If the Water Heater or the piping
is frozen, do not use the Water
Heater or it may get damaged.
4 mm thick
Hot water fixture

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
12
If the water heater will not be used for
a long period of time, drain the water.
• To prevent damage from freezing, the water
heater must be plugged into power at all
times. If power is unplugged, drain the water
completely from the water heater. Then use an
air compressor to remove all water from inside
the unit’s water piping.
It is recommended that Isolation Valves are
installed on the water heater, otherwise the
water connections will need to be removed to
drain the unit completely. Freeze damage due to
not draining properly will not be covered under
warranty.
• Drain water into a bucket to prevent water
damage.
To avoid burns, wait until the equipment cools
down before draining the water. The appliance
will remain hot after it is turned off.
CAUTION
1. Close the gas supply valve.
2. Turn and leave open the hot water fixtures for
more than 2 minutes and close.
* When the remote
controller is installed, set
“Operation Button ON”.
Turn and leave open the
hot water fixtures for
more than 2 minutes and
close.
(An 11 Error Code may
appear on the remote controller. This is not a
malfunction of the unit. Do not turn Operation
Button OFF.)
3. Close the water supply valve and disconnect the
electrical power supplied to the unit.
Hot water fixture
Do not touch with wet hands.
4. Fully open all hot water
fixtures.
Hot water fixture
5. Open all drain plugs and drain the water out of
the unit.
6. When the water is completely drained, replace
all drain plugs and close the hot water fixtures.
Drain Plugs: Each drain plug might not be visible if
insulation is installed around the piping.
Turning the Unit Back On
1. Check that all drain plugs are inserted.
2. Check that all hot water fixtures are closed.
3. Follow the procedure on page 10 “Initial
operation”, steps 1 through 4.
(TH26ENG series)
(TH21ENB series, TH17ENB series)

13
Periodic Inspection
This Water Heater should be serviced by an
authorised person at regular intervals not exceeding
2 years.
To prevent burns or scalding, turn off the
Operation button and wait until the appliance
cools before performing maintenance.
WARNING
Check : A
For dust and soot in the flue exhaust.
Check : B
• For abnormal sounds during operation.
• For abnormalities in external appearance,
discolouration or flaws.
Check : C
For dust or debris in the air inlet.
Check : D
For water leaks from the Water Heater and piping.
Check
For laundry, newspaper, timber, oil, spray cans
and other combustible materials near the Water
Heater.
Periodic Maintenance
Wipe the outside surface with a wet cloth, then dry
the surface. Use a neutral detergent to clean any
stains.
Water Heater
Wipe the surface with a wet cloth.
Remote Controller
NOTE • Do not use chlorine-based,
acidic, alkaline detergents,
organic solvents such as benzine
and thinner, or Melamine
Sponge to clean the Remote
Controller.; discolouration,
deformation, scratches or cracks
may occur.
• ECB1T and ECB2T are water
resistant but not water proof.
Keep it as dry as possible.
ECM1T is not water resistant.
Regular Maintenance
(e.g. TH26ENG5N)
A
C
B
D

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
14
Inlet water filter
If the inlet water filter is covered with debris, the
hot water may not run smoothly, or the Water
Heater may put out cold water. Check and clean the
filter as explained below.
To prevent burns or scalding, turn off the
Operation button and wait until the appliance
cools before draining the water.
WARNING
1. Close the water supply valve.
NOTE Do not lose the Sealing.
2. Open all hot water fixtures.
3. With a bucket ready, remove the inlet water
filter. (about 1 L will drain out)
4. Clean the inlet water filter with a brush under
running water.
5. Reattach and close inlet water filter.
6. Close all hot water fixtures.
7. Open the water supply valve and check that
water does not leak from the inlet water filter.
(e.g. TH26ENG5N)
Sealing
Inlet water filter
Water Supply Valve

15
Initial Operation
The Water Heater does not attempt to ignite
when water is running.
• Check for reversed plumbing or crossed pipes.
• Check the inlet water filter. (See page 14)
The Water Heater attempts to ignite but fails.
• Reset the Water Heater and try again. There may
be air in the gas pipe.
• Check the gas supply pressure with a
professional.
Temperature
Hot water is not available when a fixture is
opened.
• Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture sufficiently open?
• Is the gas being cut off by the gas meter? (Can
other gas devices such as stoves be used?)
• (For ULPG) Is there enough gas in the tank? (Can
other gas devices such as stoves be used?)
• Is the inlet water filter clogged? (See page 14)
• Is the Operation button turned ON?
No water is available when a fixture is opened.
• Is the water supply cut off?
• Is the Water Heater frozen?
The hot water is not the correct temperature.
• Is the hot water fixture sufficiently open?
The bath fill water is not the setting temperature.
• If there was water in the bath already when the
bath fill begin, the temperature in the bath may
be different from the temperature setting.
The water is too hot.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See Remote Controller Owner’s Manual- Setting
and Using the Water Heater)
• If the water supply temperature is high, it is
possible for the temperature to be higher than
the temperature set on the Remote Controller.
• If only a small amount of hot water is demanded,
it is possible for the temperature to be higher
than the temperature set on the Remote
Controller.
Water takes time to become hot when turning
the hot water fixture.
• Have you allowed enough time for the cold
water in the pipes to drain out?
The water is not hot enough.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
(See Remote Controller Owner’s Manual- Setting
and Using the Water Heater)
The water is cold when only a single fixture is
open.
• The unit will not heat the water if the flow rate is
less than the following value:
- 26 litre models: 1.5 L/min
- Other than 26 litre models: 2.5 L/min
Open the fixture more or open other fixtures so
that a greater flow passes through the unit, and
the unit should begin heating again.
Fluctuations in hot water temperatures.
• Set water temperature at 48°C to 50°C. This will
allow you to use a higher flow of hot water thus
meeting the minimum flow requirement*.
* 26 litre models: 1.5 L/min
Other than 26 litre models: 2.5 L/min
• Clean the inlet water filter of any debris (See
page 14)
Amount of Hot Water
The amount of hot water at a certain fixture is
not constant.
• When hot water is demanded at other fixtures,
the amount available may be reduced.
The maximum flow available from a 26 litre
model is 26 L/min, from a 21 litre model is 21 L/
min, from a 17 litre model is 17 L/min at a 25˚C
temperature rise.
• Pressure fluctuations and other plumbing
conditions can cause the temperature and
pressure at a fixture to be unstable, but it should
stabilize after a short time.
• There are some types of hot water taps that
discharges large volumes of hot water at first but
stabilize after time.
• To keep the temperature stable, the Water
Heater limits the amount of water that can flow
through it to a small amount initially, but the
amount increases over time.
Troubleshooting

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
16
Sounds
The fan can be heard after operation is stopped.
A motor can be heard when turning the Water
Heater on or off, when opening or closing a
fixture, or after the Water Heater has been
running for a while.
• These noises indicate the proper operation of
devices which are designed to let the Water
Heater reignite more quickly, and ensure the
water temperature is stable.
Other
The Water Heater stops burning during
operation.
• Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture sufficiently open?
• Is the gas being cut off by the gas meter? (Can
other gas devices such as stoves be used?)
• (For ULPG) Is there enough gas in the tank? (Can
other gas devices such as stoves be used?)
White smoke comes out of the flue exhaust on a
cold day.
• This is normal. The white smoke is actually
steam.
The amount of hot water in the bath is less/more
than the set amount.
• When hot water is used for other fixtures while
filling the bath, the bath will not fill as much.
• If there is water in the bath already, or when
filling is stopped and restarted, the bath will fill
more.
The bath fill alarm does not sound even when
filled to the set amount.
• The bath fill alarm is set to sound when hot
water is continuously discharged for the set
volume of water.
If mixing valves are used, or if cold water is
mixed with hot water at the fixture, the bath will
fill more than the setting of the bath fill function.
Amount of hot water available has decreased
over time.
• Is the inlet water filter clogged? (See page 14)
The hot water is turbid.
• This is harmless. Small bubbles appear as the air
in the water is heated and depressurized rapidly
to atmospheric pressure.
The water appears blue.
The bath/wash-basin has turned blue.
• Colouration to a blue colour may be noticed
from small traces of copper ion contained in the
water and fat (furring). However, there are not
problems concerning health. Colouration of the
bath/wash-basin can be prevented by cleaning
frequently.
A small amount of water is discharged from the
pressure relief valve.
• This is normal. When the Water Heater is under
high pressure, a small amount of water may be
discharged from the pressure relief valve.

17
Check for an Error Code
When a failure occurs, information relating to the
error flashes on the Status Display or optional
Remote Controller. At the same time, a buzzer will
be used. To stop the buzzer sound, the Operation
button must be turned off.
If this occurs, take appropriate measures as the
following list.
Main Controller
flashing
Status Display
Error Code : 99
Cause : Abnormal combustion
Action : Contact the installer or Customer Service
for assistance.
Indication on the Status Display :
Cause : “Lo”means that the water flow is under
minimum operating water flow and is
insufficient to turn on the burner.
Indication on the Status Display :
Cause : “L1”, ”L2” or “L3” means that water flow
rate is more than minimum operating
flow, but is insufficient to turn on the
burner because of high temperature of
inlet water. This continues to be displayed
for an hour after closing the tap.
Indication on the Status Display :
Cause : This isn’t an error message. “FP” is
indicated when freeze prevention is
working.
Error Code : 11
Cause : Ignition failure
Action : Check whether the gas valve is open. Press
the Operation button to turn the Water
Heater off, open a hot water fixture, and
turn the Water Heater back on. In this
error code, you may be able to clear the
error code simply by turning the hot water
fixture OFF, then ON again. If the blinking
number doesn’t return the problem is
solved.
Error Code : (On the Status Display)
901, 903, 908
(On the Remote Controller) 90
Cause : Abnormal combustion
Action : If the display continues, contact the
installer or Customer Service for
assistance.
Error Code : (On the Status Display)
902
(On the Remote Controller) 90
Cause : Abnormal combustion, low gas supply
pressure.
Action : Have a professional check the gas supply
pressure. Contact the installer or Customer
Service for assistance.
Contact Customer Service if:
• Any other error code appears.
• An error code is indicated again after the
above actions were followed.
• There are any other questions.
In some cases, you may be able to clear the error
code by turning the hot water fixtures OFF, then
ON again. If the error code still remains, contact
the installer or Customer Service for assistance.

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
18
We will need to know:
• The Model
Check the data plate (See page 5 for the
location of the label)
• Date of purchase
See the warranty
• Details of problem
Flashing error codes, etc., in much detail as
possible
• Your name, address, and telephone number
• Desired date of visit
First follow the instructions in the troubleshooting
section. (See page 15-17)
If the error is not corrected, contact Customer
Service on 1300 412 612 (in Australia) or contact
your local Reece branch (in New Zealand).
Requesting Service
For repairs after the warranty period, there will be
a charge on any service, and service will only be
performed if the unit is deemed repairable.
See warranty Document on page 22.
The manufacturer will stock repair and maintenance
parts for this unit within ten (10) years of the date
of original manufacture.
If you want to reinstall the appliance at a different
location, confirm that the gas and power supply
indicated on the data plate are available at the new
location. If you are not sure, consult the local utility
company.
If you move to a region that uses a different type
of gas, conversion and adjustment of the appliance
will be necessary.
Warranty
Period of Time for Stocking Repair
Parts
Reinstallation
Follow-up Service

19
Specifications
• Specifications may be changed without prior notice.
• The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water
temperature.
Model Name TH26ENG5(6)N TH26ENG5(6)L TH21ENB5(6)N TH21ENB5(6)L TH17ENB5(6)N TH17ENB5(6)L
Type Installation Outdoor, Wall mounted
Air Supply / Exhaust Power Flue
Operating Pressure 200-1,000 kPa
Minimum Flow Rate 1.5 L/min 2.5 L/min
Dimensions (Height) × (Width) × (Depth) 520 mm × 350 mm × 170 mm
Weight 16 kg 15 kg 14 kg
Water Holding Capacity 0.7 L 0.5 L
Connection
Sizes
Water Inlet R 3/4 (20 mm)
Hot Water Outlet R 3/4 (20 mm)
Gas Inlet R 3/4 (20 mm)
Power
Supply
Supply 230- 240 VAC (50 Hz)
Consumption
NG/ULPG 55.0 W / 60.0 W 36.0 W / 49.0 W 31.0 W / 41.0 W
Freeze
Prevention
106 W 129 W
Burner Injector Size NG 1.45 mm / 2.1 mm 1.2 mm / 2.0 mm 1.2 mm / 1.8 mm
ULPG 1.0 mm / 1.4 mm 0.9 mm / 1.4 mm
Accessories Anchoring Screws
Item Maximum Performance
Model Name TH26ENG5(6)N TH26ENG5(6)L TH21ENB5(6)N TH21ENB5(6)L TH17ENB5(6)N TH17ENB5(6)L
Gas Consumption NG 195 MJ/hr 159 MJ/hr 125.5 MJ/hr
ULPG 195 MJ/hr 159 MJ/hr 127 MJ/hr
Maximum Hot Water Capacity (25°C Rise) 26 L/min 21 L/min 17 L/min
Performances

Thermann Owner’s Guide
Gas Continuous Flow Water Heaters
20
Maintenance
Water Heater
H3
V1 V2
V3 V4
H2
Circulating Pump
In-line
Filter
H1
Gas
Supply
Cold Water
Line
Hot Water
Line
3/4” Ball Valve Pressure Regulator
3/4” Union Circulating Pump
Check Valve Boiler Drain Valve
Solenoid Valve
Pressure
Relief Valve
When water hardness is high, following
maintenance (flushing the heat exchanger) is
recommended.
1. Disconnect the electrical power to the Water
Heater and close the gas supply valve.
2. Close the shutoff valves on both the hot water
and cold water lines (V3 and V4).
3. Connect pump outlet hose (H1) to the cold
water line at service valve (V2).
4. Connect drain hose (H3) to service valve (V1).
5. Pour chemical product used to flush heat
exchanger into water (acid 8-10% of water
content like vinegar).
6. Place the drain hose (H3) and the hose (H2) to
the pump inlet into the cleaning solution.
7. Open both service valves (V1 and V2) on the
hot water and cold water lines.
8. Operate the pump and allow chemical product
like vinegar to circulate through the water
heater for at least 1 hour at a rate of 15 L/min.
9. Turn off the pump.
10. Rinse the chemical/water from the Water
Heater as follows:
a. Remove the free end of the drain hose (H3)
from the pail. Place in sink or outside to
drain.
b. Close service valve (V2), and open shutoff
valve (V4). Do not open shutoff valve (V3).
c. Allow water to flow through the Water
Heater for 5 minutes.
d. Close shutoff valve (V4). When unit has
finished draining remove the inline filter
at the cold water inlet and clean out any
residue. Place filter back into unit and open
valve (V4).
e. Close service valve (V1), and open shutoff
valve (V3).
11. Disconnect all hose.
12. Reconnect the electrical power to the Water
Heater and open the gas supply valve.