Thermann 25W124 Troubleshooting guide

25L and 50L Electric Storage Water Heater
MODELS 25W124, 25W136, 25W124P,
50W124, 50W136, 50W124P
H3699 Rev. L
Specifications and materials may change without notice.
Eective for all Proflo 25L and 50L electric storage water
heaters manufactured and sold after 1st January 2013.
For advice, repairs and service,
call: 1800 080 055
Owner’s
Manual
Carefully remove all packaging and
transit protection from the heater before
installation. Dispose of the packaging
responsibly using re-cycling facilities
where they exist.
& INSTALLATION GUIDE
Installation Details
Owner’s Information
Warranty

1 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Installation Details 2
Plumbing Connections 4
Electrical Connection 6
Specifications 7
Operating Instructions 8
Safety Information 9
Service Information 10
Troubleshooting 11
Warranty 13
Contents

2H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Installation Details
Installation Requirements
This water heater must be installed
by a licensed tradesperson, and in
accordance with
• AS/NZS3500.4 “Plumbing
and Drainage - Heated Water
Services”.
• AS/NZS3000.
• Local authority regulations.
• Outside Australia, please refer to
local plumbing and building codes
and regulations.
• Notice to Victorian customers
from the Victorian Plumbing
Industry Commission – this water
heater must be installed by a
licensed person as required by the
Victorian Building Act (1993). Only
a licensed person will give you a
compliance certificate, showing
that the work complies with all
the relevant Standards. Only a
licensed person will have insurance
protecting their workmanship
for 6 years. Make sure you use
a licensed person to install this
water heater and ask for your
Compliance Certificate.
Water Supply Pressure
This water heater is designed for direct
connection to water supply pressures
of:
25 & 50 Litre Models – 800kPa
Where the mains pressure can exceed
or fluctuate beyond the pressure
shown above, a pressure limiting
device (complying with AS1357) must
be fitted in the cold water inlet supply.
This device must be installed after
the isolating valve and set below the
pressure shown above. Note during
periods of lower demand water
pressure may increase.
Caution: This water heater delivers
hot water at temperatures exceeding
50°C. Refer to AS/NZS3500 and
local regulations regarding the need
for additional hot water delivery
temperature control.
Pool Heating
This water heater must not be used for
pool heating.

3 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Installation Details
Location
The water heater should be located
as close as possible to the most
frequently used hot water outlet.
Adequate access must be made for
service to the element, thermostat,
relief valve and anode. Ensure that the
data plate is clearly visible.
Note: All models are equipped with a
sacrificial anode, accessible through
the top cover. Allow 50% of the height
of the water heater for clearance
above to replace the anode.
We recommend a plinth be installed
under the water heater where the
water heater is subjected to wet
conditions.
A properly drained overflow tray must
be used where property damage could
occur from water spillage. (See
AS/NZS3500.4 for further details.)
When installing this water heater in
a roof area as a mains pressure unit,
refer to local regulations.
Note: The warranty does not cover
damage due to leakage of the water
heater.

4H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Plumbing Connections
Pressure & Temperature Relief Valve
The Pressure & Temperature Relief
Valve is supplied loose with the water
heater.
Please refer to the specifications
table on page 7 for the valve ratings.
The PTR valve must be installed
directly into either of the top sockets
marked “RELIEF VALVE”. The drain
line from this valve must run in a
continuously downward direction in
a frost-free ambient position with the
discharge end left open to atmosphere
permanently.
The PTR Valve is not intended to
enable connection of the water
heater to supplementary energy
sources such as solar panels or slow
combustion stoves (refer AS/NZS
3500.4 for guidance on these types of
installations).
Open the PTR Valve for approximately
10 seconds by lifting the lever on the
valve to ensure water is relieved to
waste through the relief drain pipe.
Lower lever gently and check that it
closes correctly.
The PTR Valve must not be tampered
with or removed. The water heater
must not be operated unless this valve
is fitted and in working order.
The PTR Valve should be checked for
adequate performance or replaced at
intervals not exceeding 5 years, or less
in areas where local regulations apply.
Important: The PTR Valve and its drain
outlet pipe must not be sealed or
blocked. It is normal for the PTR valve
to leak a small amount of water during
heating cycles.
Danger: Failure to operate the relief
valve easing lever at least once every
six (6) months may result in a problem
with the water heater and in some
cases the tank may explode.
Warning: A separate drain line must
be run for this relief valve. It is not
permitted to couple drain lines from
relief valves into a single common
drain line.
Note: Brass plugs are supplied with
the water heater to plug o the
unused fittings. Ensure that a sealing
material is applied to the plugs to
prevent leaking.
Cold Water Connection
An approved isolating valve, non
return valve, line strainer (optional
but recommended), and union must
be fitted between the supply main
and either of the RP¾/20 sockets
with blue surrounds at the bottom of
the water heater. All fittings must be
approved by the relevant Authority.
See the diagram on page 5 for details.
Note for S.A. and W.A.: It is a state
requirement that an expansion control
valve be fitted on the cold water
supply line between the non return
valve and the water heater. See the
diagram on page 5 for details.

5 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Plumbing Connections
Hot Water Connection
The hot water pipe should be
connected to either of the RP¾/20
sockets with red surrounds at the
top of the water heater. For the most
economical operation of the water
heater, it is recommended that all hot
water lines are insulated. Please check
local regulations regarding the use of
hot water supply pipework that are
not made of copper.
Temperature Protection
Water heaters can produce very hot
water. To reduce the risk of scald
injury, it is mandatory under the
requirements of Australian Standard
AS/NZS3500.4 that a suitably
approved temperature control device
be fitted to the hot water supply to
outlets used primarily for personal
hygiene. This valve should be checked
at regular intervals to ensure its
operation and settings remain correct.
Note: a combined isolating valve/non-return valve/line strainer may be used.
Expansion control valve only required where local regulations demand.
Union
Connection
Non-return
Valve
Line
Strainer
Cold Water
Inlet
Drain
Expansion
Control Valve
Isolating Valve
(Spindle Vertical)
Inlet Connections

6H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Electrical Connection
This water heater is designed for
single phase 240V A.C supply only.
The electrical connection must
comply with Local Supply Authority
Regulations and AS/NZS3000.
For models pre-wired with a flexible
lead, if the supply cord is damaged, it
must be replaced by the manufacturer,
its service agent, or similarly qualified
person in order to avoid hazard.
For models not pre-wired with a
flexible lead, connections are made
at the terminal block inside the water
heater, and a means for disconnection
must be incorporated in accordance
with the wiring rules.
Entry to the connection area is
through the hole beneath the element
cover, designed to accept a 20mm
conduit. The element cover may be
removed by undoing the two screws
on the cover and sliding the cover
downwards to disengage the top
edge. Ensure that the conduit entry
is well sealed to achieve correct
weatherproofing.
Note: This water heater is fitted
with a thermostat and over-
temperature energy cut-out. Under
no circumstances should the water
heater be operated without both
these devices being in the circuit.
Replacement must be carried out
only by licensed tradespeople or
the manufacturer.
Danger: The operation of the thermal
cut-out indicates a possibly dangerous
situation. Do NOT reset the thermal
cutout until the water heater has been
serviced by a licensed tradesperson.
Caution: Water heater must be filled
with water before turning on the
electricity supply.
Electrician: Press the reset button
on thermostat to ensure over-
temperature cut-out is set.
When supply wiring has been
connected, supply wires must be
kept lower than the terminal block.

7 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Specifications
Specications 25L 50L
Storage Capacity (L) 31 53
Hot Water Delivery (L) 25 50
Net Weight Empty (kg) 17 23
Element Sizes (kW) 2.4, 3.6 2.4, 3.6
Relief Valve:
Pressure (kPa) 1000
Temperature (°C) 99
Power Rating (kW) 10
Nominal Dimensions 25L 50L
Total Height (A) 455 695
Total Width (B) 405 405
Outlet Height (C) 280 520
Inlet Height (D) 155 155
Electrical Entry (E) 65 65

8H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Safety
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 and animals should be
supervised to ensure that they do not
interfere with the appliance.
Filling The Water Heater
Open all hot water taps. Open isolating
valve at the cold water inlet slowly and
allow water heater to fill until water
flows through the system. Close each
hot water tap after the air is expelled
from its line. As noted previously
power is not to be turned on until the
water heater is filled with water.
Water Quality
Your Thermann water heater has been
manufactured to suit water conditions
of most Australian metropolitan
supplies. Please note that harsh water
supplies can have a detrimental
eect on the water heater and its life
expectancy. If you are unsure about
your water quality you can obtain
information from your local water
supply authority.
The water heater is designed for use
in areas where the Total Dissolved
Solids (TDS) content of the water
supply is less than 2500 mg/L. In areas
where the TDS exceeds 600mg/L it
is possible that the magnesium alloy
anode (supplied in the heater) may
become over reactive. To alleviate
this, the magnesium alloy anode
should be replaced with an aluminium
alloy anode, available from your local
Reece branch.
Water can also be very corrosive, the
measure of this is the saturation index.
If the water saturation index is greater
than 0.40, an expansion control valve
should be fitted. If the index is greater
than 0.80, the water heater installed
should be a Hard Water Model. Please
consult our Service Department for
advice if required.
Caution
If the water heater is left in an
operating condition and unused for
two weeks or more, a quantity of
hydrogen (which is highly flammable)
may accumulate in the top of the
water cylinder. To dissipate this gas
safely it is recommended that a hot
tap be turned on for several minutes
at a sink, basin or bath, but not a
dishwasher, clothes washer or other
appliance. During this procedure
there must be no smoking, open
flame or any other electrical appliance
operating nearby. If hydrogen is
discharged through the tap it will
probably make an unusual sound
as with air escaping.
Where the water heater is not installed
in accordance with the listed advice,
the water heater will not be covered
by the Terms of Warranty.
Operating Instructions

9 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Safety Information
Warning
For safe performance, this water
heater is fitted with:
1. Combination Thermostat and
over-temperature Energy Cut-Out.
2. Combination Pressure &
Temperature Relief Valve.
These devices must not be tampered
with or removed.
The water heater must not be operated
unless each of these devices is fitted
and in working order.
The element cover should be removed
only by licensed tradespeople.
The electrical power supply switch
must be turned o and the fuse
removed or the circuit breaker
isolated at the main electrical supply
switchboard before the water heater
electrical cover is removed.
Open the PTR Valve for approximately
10 seconds by lifting the lever on the
valve to ensure water is relieved to
waste through the relief drain pipe.
Lower lever gently and check that it
closes correctly.
The PTR Valve must not be tampered
with or removed. The water heater
must not be operated unless this valve
is fitted and in working order.
The PTR Valve should be checked for
adequate performance or replaced at
intervals not exceeding 5 years, or less
in areas where local regulations apply.
Important
The PTR Valve and its drain outlet
pipe must not be sealed or blocked.
It is normal for the PTR valve to leak a
small amount of water during heating
cycles.
Danger
Failure to operate the relief valve
easing lever at least once every six (6)
months may result in a problem with
the water heater and in some cases
the tank may explode.

10H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Service Information
Six Monthly Service (By Owner)
Operate the Pressure & Temperature
Relief Valve for approximately 10
seconds by operating the easing lever
on the valve to ensure water is relieved
to waste through the relief drain pipe.
Check to ensure the valve closes
correctly.
Five Year Service
(By licensed tradespeople Only)
The five yearly service should be
carried out by a licensed tradesperson.
It is recommended that this service
be carried out by your local Thermann
agent.
The service should include the
following:
• Replace the Pressure &
Temperature Relief Valve.
• Replace the anode. (in areas of
harsh or adverse water conditions
it is recommended that you carry
out a more frequent check of your
anode’s condition, refer Operating
Instructions “Water Quality”)
• Flush the water heater by doing
the following:
i. Turn o the power.
ii. Turn o the cold water supply
to the water heater at the
isolating valve.
iii. Gently operate the easing
lever on the Pressure &
Temperature Relief Valve to
release the pressure in the
water heater.
iv. Disconnect the cold water
inlet union to the heater and
attach a drain hose.
v. Gently operate the Pressure
& Temperature Relief Valve
to let air into the heater and
allow water to escape through
the hose.
vi. To flush the heater, carry
out steps (i) to (iv) above.
Disconnect the hot water
inlet union and attach a water
supply hose to the heater.
Turn on the water supply.
vii. Flush the heater until clear
water appears. Reconnect
all fittings, fill the heater and
restore the electricity supply.

11 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Troubleshooting
What Should I Check Before
Making A Service Call?
If there is not enough hot water, it
is recommended that the following
points be considered before making
a service call. If after checking the
following points the problem has not
been identified, please contact Reece
on 1800 080 055
No Hot Water
• Is the Pressure & Temperature
Relief Valve discharging too much
water?
• Do you have the correct size water
heater for your requirements?
Sizing details are available from
your Thermann supplier.
• Is one outlet (such as the shower)
using more hot water than you
think?
• Carefully review the family's hot
water usage and if necessary
check the shower flow rates with
a bucket, measuring the amount
of water used over that period
of time. If it is not possible to
adjust water usage patterns, an
inexpensive flow control valve
can easily be fitted to the shower
outlet.
• Consider that often the hot water
usage of showers, washing
machines and dishwashers can
be under estimated. Review these
appliances to determine if your
daily usage is greater than the
storage volume of your water
heater. For example, if you have
a 50 litre storage tank and you
are using 80 litres of water it is
possible that there will be certain
times of the day where there is
insucient hot water. It is also
advisable to inspect tap washers
etc. for leakage and replace if
necessary.
• Is there a leaking hot water pipe
or dripping hot water tap? A small
leak can waste a large quantity of
hot water.
• Replace faulty tap washers and
have your plumber rectify any
leaking pipe work.
Water Discharge from the PTR Valve
It is normal for the PTR to allow a small
quantity of water to escape during
the heating cycle. The amount of
discharge will depend on hot water
usage.
Continuous Trickle (PTR)
This is most likely due to a build up of
foreign matter. In this case try gently
raising the easing lever on the Pressure
& Temperature Relief Valve for a few
seconds then release gently. This may
dislodge a small particle of foreign
matter and rectify the fault.
Steady flow (PTR) – more than 20L
per day
This may be caused by excessive water
supply pressure, a faulty Pressure &
Temperature Relief Valve or a faulty
thermostat. Turn o the electricity
supply and contact Thermann repairs
and service hotline.

12H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Troubleshooting
High Electricity Bills
• Is the Pressure & Temperature
Relief Valve discharging too much
water?
• Is one outlet (such as the shower)
using more hot water than you
think? See “No Hot Water”.
• Is there a leaking hot water pipe
or dripping hot water tap? A small
leak can waste a large quantity of
hot water.
• Replace faulty tap washers and
have your plumber rectify any
leaking pipework.

13 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Warranty
Thermann Hot Water Unit
Manufactured by GWA Group Limited
("GWA")
Terms of Warranty and Replacement
Guarantee
All Thermann water heaters are
backed by a comprehensive one (1)
year full parts and labour warranty
(conditions apply – see below).
Furthermore, the Thermann tank
includes a guarantee to replace your
hot water unit if the inner cylinder
fails within seven (7) years (conditions
apply – see below).
The terms of the Warranty and
replacement guarantee are set out
below.
1 Year Comprehensive Warranty
Your hot water system and its
components (“Unit”) are covered by
1 year (parts and labour) warranty
against defective factory materials
or workmanship.
This warranty period commences
from the date of installation of the
Unit providing you have proof of this
installation date. Where the date
of completion of installation is not
known or cannot be proven, then this
warranty will commence one (1) month
after the date of manufacture (refer to
the data label on the unit).
Replacement Guarantee
If an inner cylinder fails on a GWA hot
water Unit within a further six (6) years
after the end of the initial one (1) year
warranty period, GWA will provide
a free replacement hot water Unit
at the nearest approved GWA agent
or GWA oce to the owner’s home.
Under this replacement guarantee, the
transport, installation and labour costs
of delivering the replacement hot
water Unit and removing and replacing
the existing hot water unit with the
replacement hot water Unit will be
the responsibility of the owner of the
existing hot water Unit.
Conditions of Warranty and
Replacement Guarantee
The benefits provided to you by the
warranty and replacement guarantee
(collectively “Warranty”) are in
addition to the guarantees and other
rights and remedies available to you
under the Australian Consumer Law
(“ACL”).
If the Unit fails to conform to this
Warranty during the applicable
period, GWA will replace any failed
component or where necessary, in the
absolute discretion of GWA, replace
the Unit free of charge including
reasonable labour costs incurred in
normal business working hours.
This Warranty only applies to defects
which have arisen solely from faulty
materials or workmanship in the Unit
and does not apply to other defects
which may have arisen as a result
of, without limitation, the following:
accidental damage, abuse, misuse,
maltreatment, abnormal stress
or strain, harsh or adverse water

14H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Warranty
conditions including excessive water
pressure or temperature, neglect of
any kind or otherwise as a result of any
use of the Unit contrary to the product
manual or other instructions provided
by GWA. Alterations or repair of the
Unit other than by an accredited and
licensed service agent or technician
are not covered. Attachment of
accessories or use of non genuine
replacement parts other than those
manufactured or approved by GWA
are not covered by this Warranty.
This Warranty applies only to the
Unit and does not cover any ancillary
plumbing or electrical parts supplied
by the installer such as pressure
limiting valve, tempering valve, line
strainer, stop cocks, non-return valve,
electrical switches, pumps or fuses, or
faulty installation.
The Unit must be installed by a
licensed plumber in accordance with
information set out in the Owner’s
Manual and/or Installer’s Guide
supplied with the Unit and/or any
relevant statutory requirements.
In addition to this Warranty, certain
legislation (including the ACL) may
give you rights which cannot be
excluded, restricted or modified. This
Warranty must be read subject to
such legislation and nothing in this
Warranty has the eect of excluding,
restricting or modifying those rights.
If GWA fails to meet a guarantee under
the ACL, your remedy for such failure
may be limited to any one or more of
the following:
• replacement of the Unit;
• repair of the Unit;
• refunding the cost of the Unit;
• payment of reasonable costs of
having the Unit repaired;
• payment in respect of the reduced
value of the Unit.
Any defective part of the Unit must
be returned to the point of sale before
replacement can be considered under
the terms of this Warranty. If the costs
of returning any defective parts are
unreasonable, please contact GWA on
1300 412 612 (Australia) so that we can
arrange a collection if appropriate.
Warranty claims can be made at the
point of sale or by posting or faxing
a warranty claim to GWA (contact
details listed below) within one (1)
month of the appearance of a defect.
Warranty claims under this extended
warranty must include the following
details:
• Date of Purchase;
• Location of Purchase;
• Proof of Purchase;
• Date of Installation;
• Contact Details
• Product Serial Number

15 H3699 Rev. L
Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
Warranty
Contact Details:
Business Address:
GWA Group Limited
Level 1, 7-9 Irvine Place
Bella Vista, NSW 2151, Australia
Telephone:
1300 412 612 (Australia)
Note: If the Unit is located in a
position that does not comply
with the installation instructions or
relevant statutory requirements,
then this Warranty does not cover
major dismantling or removal of
cupboards, doors, walls or special
equipment and/or excessive labour,
at the determination of GWA, to
make the Unit accessible for repair or
replacement.
As required by legislation, including
under the ACL, any claims for damage
to furniture, carpets, walls, foundations
or any other consequential loss either
directly or indirectly due to defects
of any kind in a Unit will only be met
by GWA where the damage could be
considered reasonably foreseeable.
Our goods come with guarantees
that cannot be excluded under the
Australian Consumer Law. You are
entitled to a replacement or refund for
a major failure and for compensation
for any other reasonably foreseeable
loss or damage. You are also entitled
to have the goods repaired or replaced
if the goods fail to be of acceptable
quality and the failure does not
amount to a major failure.

Thermann Owner’s Manual
Thermann 25/50 Litre Water Heater
For advice, repairs and service,
call: 1800 080 055
Serial Number