Rheem 551180 Technical Document

This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Owner’s Guide
and
Installation Instructions
Air Sourced 551180
Heat Pump Water Heaters

An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded from
rheem.com.au and rheem.co.nz.
This water heater is manufactured by Rheem (China) Water Heater Co. Ltd.
PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd. or Rheem (China) Water Heater Co. Ltd.
TRADE MARKS
®Registered trademark of Rheem Australia Pty Ltd and / or Rheem New Zealand Limited.
™Trademark of Rheem Australia Pty Ltd and / or Rheem New Zealand Limited.
Note: Every care has been taken to ensure accuracy in preparation of this publication.
No liability can be accepted for any consequences, which may arise as a result of its application.

3
CONTENTS
HOUSEHOLDER
This booklet contains important information about your
new water heater, including terms of the Rheem warranty.
We recommend you read pages 8 to 27,
and the terms of the Rheem warranty on pages 4 to 7.
The other pages are intended for the installer but may be of interest.
Warranty....................................................................................................................................... 4
Safety, Warnings, Installation Notes......................................................................................... 8
About Your Water Heater.......................................................................................................... 11
Display Panel ............................................................................................................................. 15
Maintenance Requirements...................................................................................................... 20
Water Supplies........................................................................................................................... 22
Save A Service Call................................................................................................................... 25
Installation.................................................................................................................................. 28
Connections –Plumbing .......................................................................................................... 36
Connections –Electrical........................................................................................................... 39
Commissioning.......................................................................................................................... 41
Draining The Water Heater ....................................................................................................... 42
Installation Report..................................................................................................................... 45
RHEEM AUSTRALIA PTY LTD, A.B.N. 21 098 823 511
RHEEM NEW ZEALAND LIMITED, NZBC 9429036696031
www.rheem.com.au, www.rheem.co.nz
For Service Telephone 131 031 AUSTRALIA or 0800 657 335 NEW ZEALAND

4
RHEEM HEAT PUMP WATER HEATER WARRANTY
- AUSTRALIA AND NEW ZEALAND ONLY -
HEAT PUMP WATER HEATER MODELS 551180
1. THE RHEEM WARRANTY –GENERAL
1.1 This warranty is given in Australia by Rheem Australia Pty Limited ABN 21 098 823 511 of 1 Alan
Street, Rydalmere New South Wales, and in New Zealand by Rheem New Zealand Limited of 475
Rosebank Road Avondale Auckland 1026.
1.2 Rheem offer a trained and qualified national service network who will repair or replace components at
the address of the water heater subject to the terms of the Rheem warranty. Rheem Service, in
addition can provide preventative maintenance and advice on the operation of your water heater. The
Rheem Service contact number in Australia is 131031, with Contact Centre personnel available
24 hours, 7 days a week to take your call and if necessary to arrange a service call for during normal
working hours Monday to Friday (hours subject to change) or in New Zealand on 0800 657 335.
1.3 For details about this warranty, you can contact us on 131031 or by email at
[e-mail] (not for service bookings), or in New Zealand on 0800 657 335 or by
email at [e-mail] (not for service bookings).
1.4 The terms of this warranty and what is covered by it are set out in sections 2 and 3 and apply to water
heaters manufactured from the 1st December 2022.
1.5 If a subsequent version of this warranty is published, the terms of that warranty and what is covered by
it will apply to water heaters manufactured after the date specified in the subsequent version.
2. TERMS OF THE RHEEM WARRANTY AND EXCLUSIONS TO IT
2.1 Rheem may reject a claim under this warranty in its sole discretion if:
a) You do not arrange for a major service to be conducted on your water heater in the fifth year after
installation, in accordance with Rheem’s recommendation in the Owner’s Guide and Installation
Instructions; and
b) The fault giving rise to the warranty claim would have been detected and rectified during that
major service.
2.2 The decision of whether to repair or replace a faulty component is at Rheem’s sole discretion.
2.3 If you require a call out and we find that the fault is not covered by the Rheem warranty, you are
responsible for our standard call out charge. If you wish to have the relevant component repaired or
replaced by Rheem, that service will be at your cost.
2.4 Where a failed component or cylinder is replaced under this warranty, the balance of the original
warranty period will remain effective. The replacement does not carry a new Rheem warranty.
2.5 Where the water heater is installed outside the boundaries of a metropolitan area as defined by
Rheem or further than 25 km from either a regional Rheem branch office or an Accredited Rheem
Service Agent’s / Centre’s office, the cost of transport, insurance and travelling between the nearest
branch office or Rheem Accredited Service Agent’s / Centre’s office and the installed site shall be the
owner’s responsibility.
2.6 Where the water heater is installed in a position that does not allow safe or ready access, the cost of
that access, including the cost of additional materials handling and/or safety equipment, shall be the
owner’s responsibility. In other words, the cost of dismantling or removing cupboards, doors or walls
and the cost of any special equipment to bring the water heater to floor or ground level or to a
serviceable position is not covered by this warranty.
2.7 This warranty only applies to the original and genuine Rheem water heater in its original installed
location and any genuine Rheem replacement parts. It does not cover any plumbing, gas fitting or
electrical parts supplied by the installer, that are not an integral part of the unit, e.g. pipe-work,
pressure limiting valve, stop valves, non-return valves, electrical switches, pumps and fuses.

RHEEM HEAT PUMP WATER HEATER WARRANTY
- AUSTRALIA AND NEW ZEALAND ONLY -
5
HEAT PUMP WATER HEATER MODELS 551180
2.8 The Rheem warranty does not cover faults that are a result of:
a) Accidental damage to the water heater or any component (for example: (i) Acts of God such as
floods, storms, fires, lightning strikes and the like; and (ii) third party acts or omissions).
b) Misuse or abnormal use of the water heater.
c) Installation not in accordance with the Owner’s Guide and Installation Instructions or with relevant
statutory and local requirements in the State or Territory in which the water heater is installed.
d) Connection at any time to a water supply that does not comply with the water supply guidelines as
outlined in the Owner’s Guide and Installation Instructions.
e) Repairs, attempts to repair or modifications to the water heater by a person other than Rheem
Service or a Rheem Accredited Service Agent / Centre technician.
f) Faulty plumbing or faulty power supply.
g) Failure to maintain the water heater in accordance with the Owner's Guide and Installation
Instructions.
h) Transport damage.
i) Fair wear and tear from adverse conditions (for example, corrosion).
j) Cosmetic defects.
k) Ice formation in the waterways of a water heater system incorporating a freeze protection system
where the electricity supply has been switched off or has failed.
l) Corrosion caused by exposure to a corrosive environment such as coastal sea air, industrial or
geothermal sulphur contamination environments, e.g., on the coast or in geothermal regions such
as Rotorua, where high levels of atmospheric Sulphur Dioxide are present in the atmosphere.
2.9 Rheem may reject a claim under this warranty in its sole discretion if a third party solar diverter is
connected to the water heater.
2.10 Subject to any statutory provisions to the contrary, this warranty excludes any and all claims for
damage to furniture, carpet, walls, foundations or any other consequential loss either directly or
indirectly due to leakage from the water heater, or due to leakage from fittings and/ or pipe work of
metal, plastic or other materials caused by water temperature, workmanship or other modes of failure.
2.11 If the water heater is not sized to supply the hot water demand in accordance with the guidelines in the
Rheem water heater literature, any resultant fault will not be covered by the Rheem warranty.
2.12 In New Zealand this warranty excludes to the extent permissible all implied warranties set out in the
Sale of Goods Act 1908 (New Zealand) and all guarantees set out in the Consumers Guarantees Act
1993 (New Zealand) to the extent that the goods are acquired for the purpose of resupply in trade
consumption in the course of a process of production or manufacture or repairing or treating in trade
other goods or fixtures on land.

RHEEM HEAT PUMP WATER HEATER WARRANTY
- AUSTRALIA AND NEW ZEALAND ONLY -
6
HEAT PUMP WATER HEATER MODELS 551180
3. WHAT IS COVERED BY THE RHEEM WARRANTY
FOR THE WATER HEATERS DETAILED IN THIS DOCUMENT
3.1 Rheem will repair or replace a faulty component of your water heater if it fails to operate in accordance
with its specifications as follows:
What components are
covered
The period from the date of
installation in which the
fault must appear in order to
be covered
What coverage you receive
551180 models
All components
Year 1
Repair and/or replacement of the faulty
component, free of charge, including
labour.
Sealed System*components
(if the water heater is installed
in a single-family
domestic dwelling)
Years 2 & 3
Repair and/or replacement of the faulty
component, free of charge, including
labour.
The cylinder
(if the water heater is installed
in a single-family
domestic dwelling)
Years 2 & 3
Repair and / or replacement of the cylinder,
free of charge, including labour.
Years 4 to 7
Replacement cylinder, free of charge.
Installation and repair labour costs are the
responsibility of the owner.
The cylinder
(if the water heater is not
installed in a single-family
domestic dwelling)
Years 2 & 3
Replacement cylinder, free of charge.
Installation and repair labour costs are the
responsibility of the owner.
* The Sealed System includes components that carry refrigerant only, e.g. Compressor, Condenser,
TX Valve, Receiver / Drier, Evaporator and associated pipe work.
3.2 Without limiting the periods shown in the table in Clause 3.1, a 5-year whole-of-product warranty
applies where a rebate has been received under Solar Victoria’s Solar Homes Program for a water
heater installed from the 1st July 2023. For further details, call 131 031. Proof of receipt of the rebate is
required to be produced at the time of the service call.
4. ENTITLEMENT TO MAKE A CLAIM UNDER THIS WARRANTY
4.1 To be entitled to make a claim under this warranty you need to:
a) Be the owner of the water heater or have consent of the owner to act on their behalf
b) Contact Rheem Service without undue delay after detection of the defect and, in any event, within
the applicable warranty period.
4.2 You are not entitled to make a claim under this warranty if your water heater:
a) Does not have its original serial numbers or rating labels.
b) Is not installed in Australia or New Zealand.

RHEEM HEAT PUMP WATER HEATER WARRANTY
- AUSTRALIA AND NEW ZEALAND ONLY -
7
HEAT PUMP WATER HEATER MODELS 551180
5. HOW TO MAKE A CLAIM UNDER THIS WARRANTY
5.1 If you wish to make a claim under this warranty, you need to:
a) Contact Rheem on 131031 in Australia or on 0800 657 335 in New Zealand and provide owner’s
details, address of the water heater, a contact number and date of installation of the water heater
or if that’s unavailable, the date of manufacture and serial number (from the rating label on the
water heater).
b) Rheem will arrange for the water heater to be tested and assessed on-site.
c) If Rheem determines that you have a valid warranty claim, Rheem will repair or replace the water
heater in accordance with this warranty.
5.2 Any expenses incurred in the making of a claim under this warranty will be borne by you.
6. THE AUSTRALIAN CONSUMER LAW
6.1 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.
6.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have
under the Australian Consumer Law.
7. THE CONSUMER GUARANTEES ACT 1993 (NEW ZEALAND)
7.1 Our goods come with guarantees that cannot be excluded under the Consumer Guarantees Act 1993
(New Zealand). If the goods fail to comply with the applicable guarantees set out under the Consumer
Guarantees Act 1993 (New Zealand) being the guarantee as to acceptable quality, the guarantee as
to correspondence with description or the guarantee as to repair and parts, or if the goods fail to
comply with any express guarantee given by Rheem, then you are entitled to a replacement or refund
and for compensation for any other reasonably foreseeable loss or damage.
7.2 The Rheem warranty (set out above) is in addition to any rights and remedies that you may have
under the Consumer Guarantees Act 1993 (New Zealand).

8
SAFETY, WARNINGS, INSTALLATION NOTES
It is important you read the following Safety and Warnings, and Relief Valves information.
SAFETY AND WARNINGS
•The heat pump will operate until a water temperature of 60°C to 70°C is reached, depending upon the
Hot Water Temperature Set Point. If the ambient air temperature is outside of the heat pump’s operating
range and heating of water is required, an electric heating unit will heat the water to this setting.
These temperatures are sufficiently hot to cause severe scalding. Water at this temperature may have
been plumbed to fixtures where water hotter than 50°C is allowed, such as the kitchen and laundry.
Refer to:
◼“How Hot Should the Water Be?” on page 12, and
◼“Hotter Water Increases the Risk of Scald Injury” on page 12, and
◼“Temperature Adjustment” on page 12.
•This water heater is only intended to be operated by persons who have the experience or the knowledge
and the capabilities to do so.
•This water heater is not intended to be operated by persons with reduced physical, sensory or mental
capabilities i.e. the infirm, or by children. Children should be supervised to ensure they do not interfere
with or play with or at the water heater.
•If the electrical supply conduit to the water heater is damaged, it must be replaced by a qualified person
in order to avoid a hazard. Phone Rheem Service or their nearest Accredited Service Agent / Centre to
arrange for an inspection.
•This water heater uses 220 V - 240 V a.c. electrical power for operation of the control systems and the
electrically operated components. The removal of the access covers will expose 220 V - 240 V a.c.
wiring. They must only be removed by a qualified person. Do not operate the water heater with any of
the covers removed.
•This water heater is supplied with an electronic thermostat, an over-temperature energy cut-out and a
combination temperature pressure 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 is in working order.
The Rheem warranty may not cover faults if the relief valve or other safety devices are tampered
with or if the installation is not in accordance with these instructions.
•DANGER: The operation of the over-temperature cut-out on the thermostat indicates a possibly
dangerous situation. If the over-temperature cut-out operates, it must not be reset and the water heater
must be serviced by a qualified person.
•For continued safety of this water heater, it must be installed, operated and maintained in accordance
with the Owner’s Guide and Installation Instructions.
•The lever on the temperature pressure relief valve and expansion control valve (if fitted) requires to be
operated every six (6) months to clear any deposits and to ensure the valve and its drain line are not
blocked.
Refer to;
◼“Relief Valves” on page 9, and
◼“Minor Maintenance Every Six Months” on page 20.
•Servicing of the water heater must only be carried out by qualified personnel. Phone Rheem Service or
their nearest Accredited Service Agent / Centre.
•Only a person qualified to install or service a water heater can drain the water heater if this is required.
•Do not modify this water heater.

SAFETY, WARNINGS, INSTALLATION NOTES
9
•In areas where there is a risk of freezing conditions, power must be available to the water heater at all
times and the electrical supply to the water heater should not be switched off, otherwise damage could
result.
Refer to:
◼“Freeze Protection” on page 11, and
◼“To Turn Off the Water Heater” on page 13.
•Do not use aerosols, stain removers and household chemicals in the vicinity of this water heater
while it is in operation. Gases from some aerosol sprays, stain removers and household chemicals are
corrosive to the materials used in the heat pump system.
•Do not store swimming pool chemicals, household cleaners, etc., near the water heater.
•Ensure the air flow, air inlet louvres and outlet grille are not obstructed in any way at any time.
RELIEF VALVES
Temperature Pressure Relief Valve
This water heater incorporates a temperature pressure relief valve
located near the top of the water heater. This valve is essential for
the water heater’s safe operation.
It is possible for the valve to discharge a quantity of water through
the drain line during each heating period. This quantity should be
equal to approximately 1/50 of the hot water used, as water expands
by this volume when heated.
Expansion Control Valve
In many areas, including South Australia, Western Australia, New
Zealand and scaling water areas, it is mandatory an expansion
control valve is fitted to the cold water line to the water heater.
The expansion control valve will discharge the quantity of water from
its drain line during the heating period instead of the temperature
pressure relief valve as it has a lower pressure rating.
Valve Operation
Continuous leakage of water from either valve and its drain line may
indicate a problem with the water heater. Refer to “Temperature
Pressure Relief Valve or Expansion Control Valve Running” on
page 26.
Warning: Never block the outlet of either valve or their drain
lines for any reason. A relief valve drain must be left open to
atmosphere and be installed in a continuously downward direction.
In locations where water pipes are prone to freezing, the relief valve
drain line must be insulated and not exceed 300 mm in length
before discharging into a tundish through an air gap.
Operate the easing lever on the temperature pressure relief valve and expansion control valve once every
six (6) months to clear any deposits and ensure the valve and its drain line are not blocked. It is very
important the lever is raised and lowered gently. Refer to “Minor Maintenance Every Six Months” on
page 20.
Warning: Water discharged from the temperature pressure relief valve drain line will be hot. Exercise
care to avoid any splashing of water by standing clear of the drain line’s point of discharge when operating
either valve’s easing lever.
DANGER: Failure to operate the easing lever on the relief valve once every six (6) months may result in
the water heater cylinder failing, or under certain circumstances, exploding.
outlet /
drain
line
lift until water
flows from the
drain line –
lower gently

SAFETY, WARNINGS, INSTALLATION NOTES
10
If water does not flow freely from the drain line when the lever is lifted, then the water heater must be
checked. Phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an
inspection.
The temperature pressure relief valve should be replaced at intervals not exceeding five (5) years and the
expansion control valve should be checked for performance or replaced at intervals not exceeding
five (5) years. The checking of the valves performance or replacement should occur more frequently in areas
where there is a high incidence of water deposits. Refer to “Water Supplies” on page 22.
INSTALLATION NOTES
This water heater must be installed:
•by a qualified person,
•in accordance with the installation instructions,
•in compliance with the Plumbing Code of Australia (PCA) and Plumbing Standard AS/NZS 3500.4,
▪This water heater is designed for outdoor installation only.
▪This water heater is intended to be permanently connected to the water mains and not connected
by a hose-set. A braided flexible hose or semi-flexible connector may be used for connection to the
water heater, where permitted by AS/NZS 3500.4.
▪Refer to dimensions diagram on page 33 for clearance requirements to provide adequate ventilation
for the heat pump.
•in compliance with the Australian / New Zealand Wiring Rules AS/NZS 3000,
▪Isolation switches must be installed in the electrical circuit to the water heater in accordance with
the Wiring Rules, so the water heater can be switched off.
▪The water heater must be directly connected to the mains power supply.
•in compliance with all local codes and regulatory authority requirements,
•in New Zealand also conforming to Clauses G12 and H1 of the New Zealand Building Code.
Installation and commissioning requirements and details for the installing plumber and licensed electrical
worker are contained on pages 28 to 42.
Mains pressure water supply
The water heater is designed to operate at mains pressure by connecting directly to the mains water supply.
The water heater is supplied with a temperature pressure relief valve with a pressure rating of 1000 kPa. If
an expansion control valve has been installed on the cold water line to the water heater, this should have a
pressure rating of 850 kPa.
The maximum mains water supply pressure for the water heater is 800 kPa if an expansion control valve is
not installed, or 680 kPa if an expansion control valve is installed. If the mains supply pressure in your area
exceeds these values, a pressure limiting valve must be installed.
The supply pressure should be greater than 350 kPa for true mains pressure operation to be achieved.

11
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single-family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
Your Rheem®air sourced heat pump water heater is designed for outdoor installation only. The Rheem air
sourced heat pump water heater has a vitreous enamel lined steel cylinder.
The model you have chosen is a 551180 water heater and is recommended for connection to an
uninterrupted 24 hour continuous tariff power supply. Depending upon the size of the household and its hot
water requirements and if the Electricity Retailer permits, an extended off-peak (overnight and day) or
Extended time-controlled power supply connection of a minimum 16 hours per day may also be suitable.
A Rheem heat pump water heater consumes less energy than an electric water heater. The impact on an
electricity account will depend on the tariff arrangement of the water heater replaced and where you live.
Contact your energy provider for more information on tariff arrangements and cost comparisons.
The water heater’s evaporator absorbs heat from the surrounding air and transfers this heat into the water.
When hot water is drawn off and cold water enters the tank, a sensor activates a fan, a compressor and the
heat pump control system. The fan draws outside air in through the air inlet louvres at the top of the water
heater. Heat is absorbed from the air by an evaporator and transferred into the water through a heat
exchanger wrapped around the water heater cylinder. The resulting cold air is then discharged through the
air outlet louvres back to atmosphere. This process continues while ever heating is required until the water in
the storage tank reaches a temperature of 60°C to 70°C is reached, depending upon the Hot Water
Temperature Set Point.
Even on cloudy or cold days, heat is drawn from the surrounding air. The heat
pump will operate when the ambient air temperature is from -7°C to 43°C.
The electric heating unit will operate when the ambient air temperature falls
below -7°C or rises above 43°C if heating is required. The efficiency of the
heat pump increases as the surrounding ambient air temperature increases.
Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.
ELECTRIC BOOSTING
Ice may begin to form on the evaporator reducing the heat pump efficiency,
when the ambient air temperature falls below 7°C and the heat pump has
been operating for an extended period. If the heat pump operates between -
7°C and 7°C for longer than 3 hours 20 minutes, the electric heating unit will
turn on to assist in the heating of the water. At ambient air temperatures
below -7°C, the water heater deactivates the heat pump operation and
switches to the electric heating unit. During these periods the evaporator will
defrost if necessary.
When operating at a temperature outside of the heat pump’s operating range, the electric heating unit will
heat the water in the water heater. The water will be heated to the Hot Water Temperature Set Point.
FREEZE PROTECTION
The water heater has an active de-frost function so the heat pump operates automatically to remove ice
which may form on its evaporator coil.
The water heater also has a freeze protection function built in for extremely cold conditions. When a power
supply is available to the water heater and the Display Panel is turned off at the water heater, the electric
heating unit will automatically turn on if the water temperature in the water heater falls to 5°C. It will heat the
water until the water temperature reaches 10°C and then turn off.
The water heater has NO WARRANTY for freeze damage if power is unavailable at the water heater.

ABOUT YOUR WATER HEATER
12
Warning: In areas where the ambient air temperature may fall below 4°C, power must be available to the
water heater at all times.
HOW HOT SHOULD THE WATER BE?
The system controls (compressor, evaporator and fan) will operate
until a water temperature of 60°C to 70°C is reached, depending
upon the Hot Water Temperature Set Point. If the ambient air
temperature is outside of the heat pump’s operating range, the
water temperature is boosted automatically to the Hot Water
Temperature Set Point by the electric heating unit, if heating is
required.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
Warning: This water heater can deliver hot water at
temperatures up to 70°C, sufficiently hot to cause severe scalding.
Water at this temperature may have been plumbed to fixtures where
water hotter than 50°C is allowed, such as the kitchen and laundry.
Check the water temperature before use, such as when entering a
shower or filling a bath or basin, to ensure it is suitable for the
application and will not cause scald injury.
We recommend and it may also be required by regulations that an approved temperature limiting device be
fitted into the hot water pipe work to the bathroom and ensuite when this water heater is installed. This will
keep the water temperature below 50°C at the bathroom and ensuite. The risk of scald injury will be reduced
and still allow hotter water to the kitchen and laundry.
TEMPERATURE ADJUSTMENT
The Hot Water Temperature Set Point for the heat pump and electric heating unit is adjustable from 60°C to
70°C. This is the temperature to which the Heat Pump and electric heating unit will heat the water and then
cut out. Refer to “Hot Water Temperature Set Point” on page 15.
DISPLAY PANEL
The water heater has a Display Panel to indicate the status of the water heater. The Display Panel also
allows the user to select the Hot Water Temperature Set Point. Refer to “Display Panel” on page 15.
TIMER CONTROL
It may be desirable for the water heater not to operate between certain hours, such as during the peak
period when connected to a Time of Use electricity supply due to a more expensive tariff rate applying.
An external timer will affect the operating times of both the heat pump circuit and the electric heating unit.
Consideration must be given to the time allowed to heat up the water in the water heater in cold conditions.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off, otherwise damage could result. Refer to “Freeze Protection” on page 11.
PRECAUTIONS
The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions.
Refer to “Maintenance Requirements” on page 20 and to “Anode Inspection and Replacement” on page 23.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back-up redundancy within the hot water system design. This
should ensure the continuity of hot water supply in the event that this water heater were to become
inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs
and building back-up redundancy into your hot water supply system.
minimum temperature set
point for heat pump and
electric heating unit
operation and minimum
recommended stored water
temperature
maximum recommended
supply temperature to
bathrooms and ensuites
maximum temperature set
point for heat pump and
electric heating unit
operation

ABOUT YOUR WATER HEATER
13
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
•Switch off the electrical supply at the water heater isolating switch on the switchboard or at the isolating
switch at the water heater.
•Close the cold water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off at the isolating switch, otherwise damage could result. Refer to “Freeze Protection” on page 11.
TO TURN ON THE WATER HEATER
•Open the cold water isolation valve fully on the cold water line to the water heater.
•Switch on the electrical supply at the water heater isolating switch on the switchboard and at the
isolating switch at the water heater.
•Check and if required turn the water heater on at the Display Panel.
Note: When the electrical supply is switched on, there will be a knocking sound coming from the heat pump
for a short period of time. This is the electronic expansion valve operating. This is normal and not a fault with
the heat pump.
HEAT PUMP OPERATION
The heat pump may take up to 5 minutes to commence operating when the power supply is switched on.
The heat pump will only operate when:
•power is available at the water heater, and
•the water in the storage tank requires heating, and
•the water temperature in the lower part of the water heater is greater than 11°C below the Hot Water
Temperature Set Point.
If the ambient air temperature is below -7°C or above 43°C and the system calls for heating, the heat pump
will not operate, and the electric heating unit will operate instead.
When the heat pump is operating, the system may switch to the electric heating unit if it detects that the
ambient air temperature is below the minimum operating temperature of -7°C or above the maximum
operating temperature of 43°C. It may also switch back to heat pump operation from the electric heating unit
if it detects the ambient air temperature has moved back to within the heat pump’s operating temperature
range.
Note: The heat pump may not turn on after having just completed a heating cycle and more hot water is
drawn from the water heater, or whilst the heat pump was operating and either power was switched off or it
was turned “Off” at the Display Panel. The heat pump will wait a few minutes before operating and the
conditions for start-up are favourable.
GOING ON HOLIDAYS
If you plan to be away from home for a few nights, we suggest you leave the water heater switched on.
If you plan to be away for a longer period, you can conserve energy by turning the water heater off at the
Display Panel. The electrical supply remains available to the water heater. The heat pump and electric
heating unit are prevented from operating under normal operation. The electric heating unit will operate as
part of the freeze protection function if the water in the water heater falls to 5°C. Refer to “Turn the water
heater “Off” at the Display Panel” on page 16 and “Freeze Protection Function”on page 19.
It is not advised to switch off the water heater at the isolating switch if there is the risk of freeze conditions.
Refer to “To Turn Off The Water Heater” on page 13.

ABOUT YOUR WATER HEATER
14
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Building Authority. 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.
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER?
The water heater is suitable for most public water supplies, however some water chemistries may have
detrimental effects on the water heater, its components and fittings. Refer to “Water Supplies” on page 22.
If you are in a known harsh water area or you are not sure of your water chemistry, have your water checked
against the conditions described on pages 22 to 24.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer’s warranty (refer to page 4). There are a number of factors
that will affect the length of service the water heater will provide. These include but are not limited to the
water chemistry, the water pressure, the water temperature (inlet and outlet) and the water usage pattern.
Refer to “Precautions” on page 12.
ENVIRONMENT
At the end of the service life of the heat pump water heater and prior to the water heater being disposed of, a
person qualified to work with refrigerants must recover the refrigerant from within the sealed system. The
refrigerant must not be vented to atmosphere. Phone Rheem Service or their nearest Accredited Service
Agent / Centre to arrange for an inspection.

15
DISPLAY PANEL
DISPLAY PANEL AND ICONS
The water heater has a Display Panel to allow the user to view the current operational status of the water
heater and to enable user input functionality.
LEDs on the Display Panel illuminate to display icons when there is power to the water heater and the water
heater is turned on at the Display Panel. The display icons provide information on the water heater’s current
operational status and mode setting, water temperature setting of the heat pump and electric heating unit,
usable hot water quantity available and fault codes. The Display Panel also has printed Selection Keys to
enable the user to change the Hot Water Temperature Set Point or turn the water heater on or off at the
Display Panel.
•Refer to “Display Panel – Display Icons and Selection Keys” on page 16 to view the Display icons and
Selection Keys which display on the Display Panel.
•Refer to “Display Icons and Selection Keys Explained” on page 17 for an explanation of each of the
icons and keys.
Memory –The water heater has a memory function. When the electricity supply is switched on to the water
heater after having been switched off, or if electricity is reinstated to the water heater after a time controlled
electricity supply period, previous settings remain stored. The water heater and heat pump will return to the
programmed state at the time the electricity supply being interrupted.
It is necessary to turn the water heater “On” at the Display Panel after the electricity supply is switched on to
the water heater at the water heater isolating switch for the first time. The water heater must be “On” at the
Display Panel for the heat pump and electric booster unit to operate and heat the water and for the Display
icons to illuminate.
FUNCTIONS AND OPERATIONAL MODES OF THE WATER HEATER
Hot Water Temperature Set Point
The Hot Water Temperature Set Point is the water temperature to which the Heat Pump and electric heating
unit will heat the water. It is user adjustable from 60°C to 70°C. Refer to “Hot Water Temperature Set Point”
on page 17.
ECO Mode
This is the standard heating mode. The ECO (Energy Conservation Only) Mode allows the Heat Pump to
operate when heating is required, and the ambient temperature is within the heat pump’s operating range of
-7°C to 43°C. Refer to “ECO Mode” on page 18.
Useable Hot Water Quantity Display
The Display Panel features a Useable Water Quantity display icon. This icon indicates the quantity of usable
hot water in the water heater. Refer to “Useable Water Quantity Display” on page 18.
Fault Codes
In the event the water heater develops a fault, a code will display in the Main Display Area This function of
the water heater indicates to the user a service call is required. Refer to “Fault Codes” on page 18.
Freeze Protection Function
The water heater has a freeze protection function built in for extremely cold conditions to protect the water
heater when the Display Panel is turned off at the water heater. Refer to “Freeze Protection Function”on
page 19.

DISPLAY PANEL
16
DISPLAY PANEL –DISPLAY ICONS AND SELECTION KEYS
TURNING THE WATER HEATER “ON” OR “OFF” AT THE DISPLAY PANEL
Turn the water heater “On” at the Display Panel
•Press the “On / Off” key.
The average water temperature in the water heater illuminates in the Main Display Area.
The Useable Water Quantity icon bars illuminate (if the water is hot).
The ECO Operational Mode icon illuminates.
The Display Panel will remain fully illuminated for three (3) minutes after a key is pressed. It will then
dim.
Note: When the water heater is turned on at the Display Panel after the electrical supply is switched on at
the isolating switch, there may be a knocking sound coming from the heat pump for a short period of time.
This is the electronic expansion valve operating. This is normal and not a fault with the heat pump. This
knocking sound may also occur when the water heater is reconnected to power from a time controlled
electrical supply after having been off.
Reilluminating the Display Panel
•To reilluminate the Display Panel fully after it has dimmed, press the “On / Off” key.
Turn the water heater “Off” at the Display Panel
•Press the “On / Off” key.
The average water temperature display in the Main Display Area goes out.
The Useable Water Quantity icon bars goes out.
The ECO Operational Mode icon goes out.
Note: If the Display Panel is in the ‘dimmed’ state, it will be necessary to press the “On / Off” key twice.
The first press reilluminates the Display Panel fully, the second press turns off the heat pump at the
Display Panel.

DISPLAY PANEL
17
DISPLAY ICONS AND SELECTION KEYS EXPLAINED
Icon Keys
Description
On / Off Key: ** used to switch the water heater “On” or “Off” at the Display
Panel and to reilluminate the Display Panel fully after it has dimmed.
Main Display Area: illuminates either the Average Water Temperature in the
water heater or the Hot Water Temperature Set Point in degrees Celsius,
depending upon the status of the water heater.
Celsius Icon: illuminates when the Main Display Area displays the Average
Water Temperature or Hot Water Temperature Set Point.
Heating Indicator Icon: illuminates solid when heating of the water is taking
place by the heat pump in ECO Mode or flashing when the electric heating unit
is operating without the heat pump.
ECO (Energy Conservation Only) Mode Icon: This is the standard heat
pump heating mode.
Useable Hot Water Quantity Display Icon: illuminates to display the quantity
of usable hot water in the water heater. The number of bars illustrates the
average water temperature in the water heater calculated from the water
temperature in both the upper part and lower part of the water heater.
Operational Mode Selector Key: This key is not used.
Up Arrow Key: used to increase the Hot Water Temperature Set Point.
Down Arrow Key: used to decrease the Hot Water Temperature Set Point.
** Note –On / Off Key: The On / Off key only turns the Heat Pump and electric heating unit “Off” at the
Display Panel. It does not switch off or isolate the electricity supply to the water heater or Display Panel. If it
is necessary to switch off the electricity supply to the water heater, then this must be done at the water
heater isolating switch on the switchboard or at the isolating switch adjacent to the water heater.
HOT WATER TEMPERATURE SET POINT
The Hot Water Temperature Set Point is the temperature to which the Heat Pump and / or the electric
heating unit will heat the water and then cut out.
•The default Hot Water Temperature Set Point is 60°C.
•The maximum Hot Water Temperature Set Point is 70°C.
•The minimum Hot Water Temperature Set Point is 60°C.
To change the Hot Water Temperature Set Point:
•Ensure the water heater is turned On at the Display Panel.
The current average water temperature in the water heater is displayed.
•Press the “Up Arrow” or “Down Arrow” Key to display the Temperature Set Point.
•Each press of the “Up Arrow” or the “Down Arrow” Key to increase or decrease the
Temperature Set Point in 1°C increments.
The selected temperature will flash five times before turning solid.

DISPLAY PANEL
18
ECO MODE
The ECO (Energy Conservation Only) Mode is the standard day to day operational and heating mode by the
heat pump. This mode allows for the Heat Pump to operate during normal operation when heating is
required. The ECO icon illuminates on the Display Panel.
The heat pump will operate when there is:
•electricity supply to the water heater, and
•the water heater is turned “On” at the Display Panel, and
•the water temperature in the lower part of the water heater is greater than 11°C below the Hot Water
Temperature Set Point, and
•the ambient temperature is between the heat pump’s operating range of -7°C to 43°C.
If the heat pump operates between -7°C and 7°C for an extended period of time, the electric heating unit
may turn on to assist in the heating of the water.
The electric heating unit will operate if the ambient air temperature is outside of the heat pump’s operating
range of -7°C to 43°C and heating of the water is required.
USEABLE HOT WATER QUANTITY DISPLAY
The Display Panel features a Useable Hot Water Quantity display icon. This icon indicates the quantity of
usable hot water in the water heater. The more bars illuminated, the more hot water there is available.
The display ranges from no illumination of bars, which indicates the
average temperature of the water in the water heater is below 36°C,
to the illumination of twenty five bars, which indicates the water
heater is full of hot water. The number of bars illustrate the average
water temperature in the water heater calculated from the water
temperature in both the upper part and lower part of the water
heater. It is an approximation only.
The first solid vertical bar represents an average tank temperature of 36°C. Each subsequent solid bar
represents an increase of average water temperature in the water heater by 1°C. When all 25 bars are
illuminated solid, the average tank temperature is 60°C or above. It may be above 60°C if the Hot Water
Temperature Set Point is greater than 60°C.
Whilst the water heater is heating water, the illuminated bars will fluctuate back and forth from left to right.
FAULT CODES
The Main Display Area will display a fault code in the event the water heater develops a fault. In addition, a
one off six (6) second beeping alarm will sound from the Display Panel if a fault code is displayed.
The fault code will display alternately with the average water temperature in the water heater. If there is more
than one fault code, each code will display alternately with the other fault code(s) and the average water
temperature.
The fault codes which may appear are:
•E0, E2, E3, E4, E5, E6, E7, E8, EF –The heat pump will not operate. The electric heating unit will
operate to heat the water when heating is required, to provide hot water until a service call is made to
repair the fault.
•EA –The heat pump and electric heating unit will not operate and there will be no heating of the water.
•EC –The heat pump and electric heating unit will not operate. This is an over-temperature fault which
will reset when the water in the bottom two thirds of tank is replaced with cold water as hot water is
drawn off. If the fault reoccurs, a service call must be made.
If one or more of the above codes is displayed on the Display Panel, make a note of the fault code(s) and
phone Rheem Service or their nearest Accredited Service Agent / Centre to arrange for an inspection.
Useable Hot Water Quantity Display

DISPLAY PANEL
19
FREEZE PROTECTION FUNCTION
The water heater has a freeze protection function built in to protect the water heater in extremely cold
conditions and the water temperature in the water heater falls to 5°C. This condition will only occur if the
Display Panel is turned off at the water heater. The power supply to the water heater must be turned on at
the isolating switch and power must be available to the water heater.
The electric heating unit will automatically turn on if the water temperature in the
water heater falls to 5°C. It will heat the water until the water temperature
reaches 10°C and then turn off.
The code Fd and the Heating Indicator Icon will illuminate solid in the Display
area of the Display Panel.

20
MAINTENANCE REQUIREMENTS
MINOR MAINTENANCE EVERY SIX MONTHS
It is recommended minor maintenance be performed every six (6) months. Minor maintenance can be
performed by the dwelling occupant.
Switch off the electrical supply at the power outlet to the water heater prior to performing general
maintenance. This will prevent the water heater from operating while you clean or spray around the water
heater. Switch on the electrical supply at the power outlet to the water heater when finished performing the
general maintenance.
The minor maintenance includes:
•Operate the easing lever on the temperature pressure relief valve. It is very important the lever is
raised and lowered gently. Refer to “Relief Valves” on page 9.
Warning: Water discharged from the temperature pressure relief valve drain line will be hot.
Exercise care to avoid any splashing of water by standing clear of the drain line’s point of discharge
when operating the valve’s easing lever.
•Operate the easing lever on the expansion control valve. It is very important the lever is raised and
lowered gently. Refer to “Relief Valves” on page 9.
If water does not flow freely from the drain line of either the temperature relief valve or expansion control
valve when the easing lever is operated, phone Rheem Service or their nearest Accredited Service
Agent / Centre to arrange for an inspection.
•The jacket of the water heater can be cleaned with a soft cloth and warm mild soapy water if required.
Under no circumstances should abrasive materials or powders be used.
•Inspect around the air inlet and outlet louvres and the water heater in general for plant growth.
▪Trim back any shrubs, bushes or other plants which have encroached around the water heater.
Plant growth across the air inlet and outlet louvres can interfere with the performance of the water
heater.
•Inspect around the water heater for infestations of insects, such as ants. Insects encroaching into or
nesting in the water heater can interfere with the operation of the water heater and also damage
components. The area around the water heater can be sprayed with insecticide to rid the area of
insects.
Warning: Do not spray insecticide near the water heater while the heat pump is operating.
▪If necessary to rid the area of insects:
➢Ensure the electrical supply at the power outlet to the water heater has been switched off.
➢Spray the affected are, taking care not to spray into the air inlet or outlet louvres or onto the
surface of the water heater.
➢Wait a few minutes to allow any aerosol gases to dissipate before switching on the electrical
supply at the power outlet to the water heater.
•Inspect and check the condensate drain hose.
◼Remove the drain hose from the drain spigot towards the rear of the heat pump. Use a garden hose
to run water through the drain hose and dislodge any foreign bodies. Reconnect the drain hose to
the drain spigot. Ensure the garden hose and drain hose are well clear of the heat pump and its
components.