Dux Proflo 25S124 User manual

25L and 50L Electric Storage Water Heater
Owner’s Manual
Models: 25S124, 25S136, 25S124P,
50S124, 50S136, 50S124P
028299 Rev. B
Specications and materials may change without notice.
Effective for the above model numbers of electric storage water heaters manufactured and
sold after 1st August 2020.
For advice, repairs and service, call:
1300 365 115 (Australia)
0800 729 389 (New Zealand)
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 Details
Owner’s Information
Warranty

Important Safety Information
Owner’s Manual – Proflo 25/50 Litre Water Heater
i028299 Rev. B
WARNING – 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.
WARNING – FOR CONTINUED
SAFETY OF THIS APPLIANCE IT
MUST BE INSTALLED, OPERATED
AND MAINTAINED IN ACCORDANCE
WITH THE MANUFACTURER’S
INSTRUCTIONS.
This water heater 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 water
heater by a person responsible for their
safety.
Children should be supervised to ensure
they do not interfere with the water heater.
Ensure animals are supervised so they do
not interfere with the water heater.
DO NOT store chemicals or ammable
materials, or spray aerosols near this water
heater.
DO NOT modify this water heater.
DO NOT operate the water heater with any
panels or covers removed.
If the water heater is not used for two weeks
or more, a quantity of hydrogen (which is
highly ammable) may accumulate inside the
water heater tank.
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 ame or any other electrical
appliance operating nearby. If hydrogen is
discharged through the tap it will probably
make a sound similar to air escaping.
RELIEF VALVE:
The Pressure & Temperature Relief (PTR)
Valve must be installed directly into the RP½”
(DN15) socket marked “RELIEF VALVE”.
The PTR Valve rating is 1,000 kPa and
10 kW on 25L and 50L capacities.
The valve must not be tampered with or
removed. The water heater must not be
operated unless this valve is tted and in
working order.
The drain line from the PTR Valve must
be installed in a continuously downward
direction in a frost free environment.
The PTR Valve is to be operated regularly
to remove lime deposits and to verify it is
not blocked. The drain line tted to the PTR
Valve must be left open to the atmosphere.
DANGER: Failure to operate the PTR Valve
easing lever at least once every
six months may result in the water
heater exploding. Continuous
leakage of water from the valve
may indicate a problem with the
water heater.
The PTR Valve should be checked by
a licensed tradesperson for adequate
performance, or replaced at intervals not
exceeding 5 years, or less in areas where
local regulations apply.

Important Safety Information
Owner’s Manual – Proflo 25/50 Litre Water Heater
ii
028299 Rev. B
It is normal for water to drip from the drain
line tted to the PTR Valve during heating
cycles.
Continuous leakage of water from the PTR
Valve may indicate a problem with the water
heater. This may be caused by excessive
water supply pressure, a faulty PTR Valve or
a faulty thermostat.
Turn off the water heater and contact Dux
After Sales and Service.
OVER-TEMPERATURE ENERGY
CUT-OUT:
The operation of the over-temperature
energy cut-out indicates a possibly
dangerous situation. Do NOT reset the
over-temperature energy cut-out until the
water heater has been serviced by a licensed
tradesperson.
ELECTRICAL SAFETY:
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/NZS 3000
(known as the Wiring Rules). A means for
disconnection must be incorporated in the
xed wiring in accordance with the Wiring
Rules.
If the power supply cord is damaged, it must
be replaced by the manufacturer, a service
agent or a similarly qualied person in order
to avoid a hazard.
Any electrical covers should be removed only
by a licensed tradesperson, and only after
the electrical supply to the water heater has
been isolated.
When the supply wiring has been
connected, ensure the wires are kept
lower than the terminal block.
Excess wire is not to be looped close to the
thermostat or tank.
In addition to the Pressure & Temperature
Relief Valve, electric storage water heaters
are tted with a combination thermostat and
over-temperature energy cut-out.
This device must not be tampered with
or removed. Replacement of this device
must only be carried out by a licensed
tradesperson or the manufacturer.
The water heater must not be operated
unless this device is tted and in working
order.
COLD WATER CONNECTION:
The water heater is intended to be
permanently connected to the water supply
main, and not connected by a hose-set.
This water heater is designed for direct
connection to water supply pressures of up
to 800 kPa on 25L and 50L capacities.
Where the mains pressure can exceed or
uctuate beyond this pressure, a pressure
reducing valve must be tted in the cold
water inlet supply.
Instructions explaining how the water heater
can be drained can be found on page 5.

Owner’s Manual – Proflo 25/50 Litre Water Heater
028299 Rev. B
Important Safety Information
INSTALLATION REQUIREMENTS
GENERAL:
This water heater must be installed by a
licensed tradesperson, and in accordance
with:
• In Australia, the Plumbing Code of
Australia (PCA);
• In New Zealand, Clause G12 of the New
Zealand Building Code (NZBC);
• AS/NZS 3000 Electrical Installations
(known as the Australian / New Zealand
Wiring Rules); and
• Local authority regulations.
Outside Australia and New Zealand, please
refer to local plumbing and building codes and
regulations.
Failure to comply with these requirements may
affect the warranty.
AS/NZS 3500.4 Plumbing and Drainage –
Heated Water Services provides a Deemed-to-
Satisfy Solution for the PCA and a Verication
Method for Clause G12 of the NZBC. Other
methods of compliance are available. Dux
recommends that installations conform with
AS/NZS 3500.4.
NOTE FOR VICTORIA:
This water heater must be installed by a
licensed person as required by the Victorian
Building Act (1993).
Only a licensed person will provide a
compliance certicate, showing that
the work complies with all the relevant
Standards. Only a licensed person will have
insurance protecting their workmanship.
LOCATION:
The water heater should be located as close
as possible to the most frequently used hot
water outlet.
Ensure the compliance plate and associated
warnings are clearly visible. The water
heater must be accessible without the use
of a ladder or scaffold. Adequate clearance
must be available for service to the element,
thermostat, relief valve and anode. All
models are equipped with a sacricial anode,
allow half of the height of the water heater to
provide access through the top cover.
Electric storage water heaters may be
installed indoors. A properly drained safe tray
must be installed where property damage
could occur from water spillage. Refer to
AS/NZS 3500.4 for further information.
Note - the warranty will not cover damage
due to leakage of the water heater if a
properly drained safe tray has not been
installed.
Refer to local regulations before installing the
water heater in a roof space.
WATER HEATER SUPPORT:
The water heater must be installed on a at,
solid supporting surface. The pipework must
not be used to support the water heater.
Where the water heater is subjected to wet
conditions, a plinth should be installed under
the water heater.
POOL HEATING:
This water heater must
not be used for pool
heating.
iii

Owner’s Manual – Proflo 25/50 Litre Water Heater
1
028299 Rev. B
Important Safety Information i
Installation Requirements iii
Plumbing Connections 2
Specications 4
Filling and Draining 5
Electrical Connection 6
System Maintenance 7
Considering a Service Call? 8
Warranty 9
© Dux Manufacturing Limited 2020. All rights reserved.
Contents

Owner’s Manual – Proflo 25/50 Litre Water Heater
2028299 Rev. B
Relief Valve:
The Pressure & Temperature Relief (PTR) Valve,
along with a brass reducer, is supplied loose
with the water heater.
The PTR Valve rating is 1,000 kPa.
The PTR Valve rating is also shown on the
compliance plate. The PTR Valve must be
installed with the brass reducer directly into
either of the RP¾”(DN20) sockets marked
“RELIEF VALVE”. Ensure that a sealing material
is applied to the PTR Valve and the brass
reducer to prevent water leaks.
The unused socket marked “RELIEF VALVE”
is to be plugged with one of the brass plugs
supplied loose with the water heater. Ensure
that a sealing material is applied to the brass
plug to prevent water leaks.
The drain line from the PTR Valve must be
made of copper and run in accordance with
the requirements of AS/NZS 3500.4. It must
be installed in a continuously downward
direction in a frost free environment.
The PTR Valve and its drain line must not
be sealed or blocked. Generally a separate
drain line must be run for the valve although
it may be joined with the drain line from
the expansion control valve under certain
circumstances.
Care must be taken when attaching pipe
saddles to the water heater. Self-drilling screws
no longer than 12 mm are recommended.
It is normal for the valve to leak a small amount
of water during heating cycles.
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 to AS/NZS 3500.4 for guidance on these
types of installations.
Hot Water Connection:
The hot water pipe is to be connected to either
of the RP¾”(DN20) sockets with red surrounds
at the top of the water heater.
The unused socket with red surrounds is to be
plugged with one of the brass plugs supplied
loose with the water heater. Ensure that a
sealing material is applied to the brass plug to
prevent water leaks.
It is recommended that all hot water pipes are
insulated. Hot water pipes installed outdoors
should be insulated with UV stabilised insulation.
Plastic pipes or ttings shall not be used within
1 metre of the outlet although they may be used
downstream of a temperature control valve.
Refer to AS/NZS 3500.4 for further details.
Temperature Protection:
Water heaters can produce very hot water. To
reduce the risk of scald injury, it is mandatory
under the requirements of AS/NZS 3500.4 that
an approved temperature control device is tted
to the hot water supply to outlets used primarily
for personal hygiene. This device should be
checked at regular intervals to ensure its
operation and settings remain correct.
Water Supply:
This water heater has been manufactured to
suit the water conditions of most Australian
metropolitan supplies.
Please note certain water supplies can have
a detrimental effect on the water heater and
its life expectancy. If you are unsure about the
water supply you can obtain information from
the local water supply authority.
Plumbing Connections

Owner’s Manual – Proflo 25/50 Litre Water Heater
3
028299 Rev. B
Plumbing Connections
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.
The Tank Failure Warranty does not apply in
areas where the TDS exceeds 2500 mg/L.
In areas where the TDS exceeds 600mg/L, it is
possible the magnesium alloy anode (supplied
in standard water heaters) may become over-
reactive. To alleviate this, the magnesium alloy
anode should be replaced with an aluminium
alloy anode. Aluminium alloy anodes are
available from your local Dux Supplier.
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 tted. If
the index is greater than 0.80, the electrical
heating element should be replaced with a low
power density Incoloy heating element. Please
consult Dux After Sales and Service for advice
if required.
Cold Water Connection:
The water heater is intended to be permanently
connected to the water supply main, and not
connected by a hose-set.
An approved isolating valve, non-return valve, line
strainer (optional but recommended) and union
must be tted between the water supply main
and either of the RP¾”(DN20) sockets with blue
surrounds at the bottom of the water heater. See
the diagram on page 5 for details.
All ttings must be approved by the relevant
Authority. Plastic pipes or ttings shall not be
used between the isolating valve and the inlet.
The unused socket with blue surrounds is to be
plugged with one of the brass plugs supplied
loose with the water heater. Ensure that a
sealing material is applied to the brass plug to
prevent water leaks.
Water Supply Pressure:
This water heater is designed for direct
connection to water supply pressures of up to
800 kPa .
Where the mains pressure can exceed or
uctuate beyond this pressure, a pressure
reducing valve must be tted in the cold water
inlet supply.
Note for New Zealand, South Australia and
Western Australia:
It is a requirement in these locations that an
expansion control valve be tted on the cold
water supply line between the non-return valve
and the water heater.

Owner’s Manual – Proflo 25/50 Litre Water Heater
4028299 Rev. B
Specifications
Specifications 25L 50L
Storage Capacity (L) 31 50
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) 455 670
Total Width (B) 405 405
Outlet Height (C) 275 490
Inlet Height (D) 145 145
Electrical Entry (E) 70 70

Owner’s Manual – Proflo 25/50 Litre Water Heater
5
028299 Rev. B
Filling and Draining
Filling the Water Heater:
The water heater must be lled with water
before turning on the electrical supply.
1. Open all hot water taps.
2. Open the isolating valve at the cold
water inlet slowly and allow the water
heater to ll until water ows through the
system.
3. Close each hot water tap after the air is
expelled from its line.
4. Open the Pressure & Temperature Relief
Valve for approximately 10 seconds
by lifting the easing lever on the valve.
Conrm water is relieved to waste
through the relief valve drain pipe.
5. Lower the lever gently and check it
closes correctly.
Draining the Water Heater:
1. Turn off the electricity supply to the
water heater.
2. Turn off the cold water supply to the
water heater at the isolating valve.
3. Gently operate the easing lever on the
Pressure & Temperature Relief (PTR)
Valve to release the pressure in the
water heater.
4. Disconnect the cold water inlet union
and attach a drain hose to the water
heater.
5. Gently operate the easing lever on the
PTR Valve to let air into the water heater
and allow water to escape through the
hose.
Note: a combined isolating valve/non-return valve/line strainer may be used.
The expansion control valve is only required where local regulations demand, although it is
recommended in areas where the water saturation index is greater
than 0.40.
Cold Water Connection Diagram:

Owner’s Manual – Proflo 25/50 Litre Water Heater
6028299 Rev. B
Electrical Connection
General:
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/NZS 3000.
Pre-Wired Models:
Water heaters with the letter “P” at the end
of their model number are factory tted with
a power supply cord. These water heaters
may be plugged into a standard general
purpose power outlet.
If the power supply cord is damaged, it must
be replaced by the manufacturer, a service
agent or a similarly qualied person in order
to avoid a hazard.
“Hard Wired” Models:
Water heaters without the letter “P” at the
end of their model number are not factory
tted with a power cord.
Connection of the electrical wiring must only
be carried out by a licensed tradesperson.
Before removing the electrical cover, ensure
the electrical power supply is safely isolated.
Connections are made at the terminal
block under the water heater electrical
cover, and a means for disconnection
must be incorporated in the xed wiring in
accordance with the Wiring Rules.
The electrical cover may be removed by
undoing the two screws at the bottom of the
cover and sliding the cover downwards to
disengage the top edge.
Cable entry to the connection area is through
the hole in the case beneath the electrical
cover, designed to accept a 20mm conduit.
Ensure the conduit entry is well sealed to
achieve the correct weatherproong.
When the supply wiring has been connected,
ensure the wires are kept lower than the
terminal block.
Before replacing the electrical cover, press
the reset button on the thermostat to ensure
the over-temperature energy cut-out is set.
Ensure the water heater is lled with
water before turning on the electricity
supply.

Owner’s Manual – Proflo 25/50 Litre Water Heater
7
028299 Rev. B
System Maintenance
Regular servicing will help to extend the life
of the water heater, and keep it operating
safely and efciently.
Your water heater warranty is not conditional
on completing the regular servicing
recommended in this manual. The
conditions applying to your water heater
warranty are set out on page 9 of this
manual.
Six Month Service:
This service may be carried out by the
owner.
1. Stand clear of the Pressure &
Temperature Relief (PTR) Valve drain
pipe outlet.
2. Open the PTR Valve for approximately
10 seconds by lifting the easing lever on
the valve. Conrm water discharges to
waste through the drain pipe.
3. Lower the easing lever gently and check
it closes correctly.
4. Repeat the above process for the
expansion control valve (if installed).
Other than this, personally inspecting or
servicing any part of the water heater is not
recommended.
Five Year Service:
This service should only be carried out by a
licensed tradesperson.
In locations where the water has Total
Dissolved Solids (TDS) exceeding 600 mg/L,
this service is recommended every 3 years.
This service should include the following:
• Replace the PTR Valve.
• Replace the anode.
• Inspect and ush the expansion control
valve (if installed).
• Drain and ush the water heater.
• Inspect the condition of the electrical
conduit and the water heater electrical
cover. Replace any damaged
components.
Replacement parts are available.

Owner’s Manual – Proflo 25/50 Litre Water Heater
8028299 Rev. B
It is recommended that the following points
be reviewed before making a service call:
No Hot Water:
Ensure the power supply circuit breaker
has not “tripped”. If the water heater is on a
timed tariff such as off-peak, ensure this is
operating correctly.
High Energy Bills or Insufcient Hot
Water:
• Often the hot water usage of showers,
washing machines and dishwashers
can be under estimated. Review these
appliances to determine if the daily
usage is greater than the capability of
the water heater.
• If necessary check the shower ow
rates with a bucket, measuring the
amount of water used over a period of
time. If it is not possible to adjust water
usage patterns, an inexpensive ow
control valve can easily be tted to the
shower outlet.
• Is the water heater the correct size for
the requirements? Sizing details are
available from your Dux supplier.
• 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 arrange
for your plumber to rectify any leaking
pipe work.
• Is the Pressure & Temperature Relief
Valve discharging too much water? See
below.
Continuous Trickle of Water from Pres-
sure & Temperature Relief (PTR) Valve:
This is most likely due to a build up of foreign
matter. In this case, try gently raising the
easing lever on the PTR Valve for a few
seconds, then release gently.
This may dislodge a small particle of foreign
matter and rectify the fault.
Water Discharge from PTR Valve:
It is not unusual for a small quantity of water
to discharge during the heating of water in
the storage tank. The amount of discharge
will depend on hot water usage and the size
of the storage tank.
As a guide, it will discharge about 2% of the
volume of the water heated.
Continuous leakage of water from the PTR
Valve may indicate a problem with the water
heater. Turn off the water heater and contact
Dux After Sales and Service.
If after checking the above points, the
problem has not been identied, please
contact Dux After Sales and Service.
Considering a Service Call?

Owner’s Manual – Proflo 25/50 Litre Water Heater
9
028299 Rev. B
Warranty
Dux Electric Storage Water Heater -
Warranty Summary:
All components of the water heater are covered
by a 1 year parts and labour warranty. The
storage tank is covered for a further 6 years
against failure. See below for details and
conditions.
The benets provided to you by this warranty
are in addition to any other rights and remedies
available to you under the Australian Consumer
Law.
One Year Parts and Labour Warranty:
Dux Manufacturing Limited (“Dux”) warrants
against defects in the water heater arising from
faulty materials or workmanship for a period of
one year. Conditions apply (see below).
During this period Dux will repair or replace any
failed component or where necessary, in the
absolute discretion of Dux, replace the water
heater, free of charge including reasonable
labour costs incurred during normal business
working hours.
Seven Year Tank Failure Warranty:
Dux also warrants against failure of the storage
tank for a further period of six years. Conditions
apply (see below).
During this period Dux will provide a
replacement water heater free of charge.
Installation and other labour costs are the
responsibility of the owner.
Warranty Conditions:
The warranty only applies to the water heater
itself and the components supplied with the
water heater by Dux. The warranty does not
cover components supplied by others, including
the installer.
The tank failure warranty does not apply if the
water heater has been connected to a water
supply where the Total Dissolved Solids content
is greater than 2500 mg/L.
These warranties do not apply to defects that
are a result of, without limitation, the following:
• failure to install the water heater in
accordance with the installation instructions
or statutory requirements;
• faulty plumbing or water supply including
excessive pressure;
• faulty power supply;
• use of the water heater in a manner
contrary to this manual or other instructions
provided by Dux;
• alterations or repair of the water heater
other than by an accredited and licensed
service agent or technician;
• accidental damage or abuse.
If the water heater is installed in a position that
does not comply with the installation instructions
or 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 Dux, to make the water heater accessible for
repair or replacement.
Where the Dux water heater is located
outside the metropolitan area of a capital city
and is more than 100km from a Dux ofce
or Dux agent, the Owner will be responsible
under the warranty for paying the costs
of transporting the water heater and or
any component in the water heater to and
from an approved Dux agent or Dux ofce
(including any insurance associated with that
transport), or paying the travelling time of an
approved Dux agent to and from the owners
premises.

Owner’s Manual – Proflo 25/50 Litre Water Heater
10 028299 Rev. B
Warranty
Commencement of Warranty:
The warranty period commences from the date
of installation of the water heater. Where proof
of the date of installation is not available, the
warranty period commences on the date of
manufacture of the water heater. This is shown
on the compliance plate on the outside of the
water heater.
The replacement of the water heater, or a
component of it, under this warranty does not
change the warranty commencement date.
The original commencement date continues to
apply.
Consequential Losses:
Claims for damage to furniture, carpets, walls,
foundations or any other consequential loss
either directly or indirectly due to defects of
any kind in the water heater will only be met by
Dux where the damage could be considered
reasonably foreseeable and the water
heater was installed in accordance with the
installation instructions and all relevant statutory
requirements.
The Australian Consumer Law (“ACL”):
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 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.
If Dux 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 water heater;
• repair of the water heater;
• refunding the cost of the water heater;
• payment of the reasonable costs of having
the water heater repaired;
• payment in respect of the reduced value of
the water heater.

How to Make a Warranty Claim:
Warranty claims can be placed by completing
the following steps:
• Contact Dux on one of the numbers listed
below.
• Select the “Service” option followed by the
“Hot Water” option.
• Provide the serial number and model
number of the water heater. This can be
found on the compliance plate on the
outside of the water heater.
• Provide your full name, address and
contact number.
• Provide proof of date of installation for
warranty to commence from that date,
rather than from the date of manufacture.
See Commencement of Warranty on page
10.
Please note, if the defect or fault is not covered
by the warranty or guarantee, you will be
responsible for the costs incurred by the service
agent or technician.
Contact Details:
Dux Manufacturing Limited
Lackey Road
Moss Vale, NSW, 2577
Australia
1300 365 115 (Australia)
0800 729 389 (New Zealand)
Email: [email protected]
Warranty
Owner’s Manual – Proflo 25/50 Litre Water Heater
11
028299 Rev. B

Electric Storage Water Heaters
Serial Number
For advice, repairs and service, call:
1300 365 115 (Australia)
0800 729 389 (New Zealand)
Date of Installation: �����������������������������������������������������������������������������������������������������������������������������������������������
Installer’s Name: �����������������������������������������������������������������������������������������������������������������������������������������������
Installer’s Company: �����������������������������������������������������������������������������������������������������������������������������������������������
Installer’s Licence No: ������������������������������������������������������������������������������������������������������������������������������������ ��������
Installer’s Signature: �����������������������������������������������������������������������������������������������������������������������������������������������
www.dux.com.au/warranty
Please Register Your Water Heater
Please take a moment to fill
out your details for warranty
registration at:
This will ensure all your current details are
registered with us for prompt warranty
service if required.
To view our privacy policy please visit
http://www.dux.com.au/p/privacy
or use your smartphone to scan this code:
028299 Rev. B