Rheem Solar Hiline 52D Series 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
Solar Hiline®Water Heater
52D Series Open Circuit
WARNING: Plumber –Be Aware
Use copper pipe ONLY. Plastic pipe MUST NOT be used.
It is a requirement of a solar water heater installation that all pipe work be in copper
and not plastic, due to the effects of high water temperatures and pressures.

An electronic copy of these Owner’s Guide and Installation Instructions can be downloaded from rheem.com.au.
PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Rheem Australia Pty Ltd.
TRADE MARKS
®Registered trademark of Rheem Australia Pty Ltd.
™ Trademark of Rheem Australia Pty Ltd.
Colorbond®is a registered trademark of BlueScope Steel 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.
WARNING: Plumber –Be Aware
•The solar hot and solar cold pipe work between the solar Hiline storage tank and the solar collectors
are supplied in the pipe kit. The supplied copper solar hot and solar cold pipes MUST BE used.
•If the solar water heater is installed either on a metal roof or in a trafficable area, such as on an
accessible roof, then the solar hot and solar cold pipes must be insulated. The solar hot and solar cold
pipes may be required to be insulated to comply with local regulations.
If insulation is required, the full length of the solar hot and solar cold pipes MUST BE insulated.
The insulation must:
◼be of a closed cell type or equivalent, suitable for a solar water heating application and capable
of withstanding the temperature of the water generated by the solar collectors under stagnation
conditions
The specification of the chosen insulation material should be checked with the insulation
manufacturer prior to installation as different materials may vary in temperature tolerance
◼be at least 13 mm thick
◼be weatherproof and UV resistant
◼be fitted up to and cover the connections on both the solar storage tank and the solar collectors.
The insulation will offer protection to a metal roof against corrosion due to water running off the copper
pipes, assist in avoiding accidental contact with the solar pipe work as very high temperature water
can flow from the solar collectors to the solar storage tank, and also reduce pipe heat losses.
•Plastic pipe MUST NOT be used, as it will not withstand the temperature and pressure of the water
generated by the solar collectors under stagnation conditions. Extremely high water temperatures and
extremely high water pressures can be generated under these conditions. Plastic pipe cannot
withstand these temperatures and pressures and MUST NOT be used. Failure of plastic pipe can lead
to the release of high temperature water and cause severe water damage and flooding.
•There MUST BE a continuous fall of a minimum 10° in the pipe work from the solar Hiline storage
tank to the solar collectors. The highest point of the solar cold pipe and solar hot pipe must be where
they connect to the solar Hiline storage tank, otherwise thermosiphoning will not occur.
•A non-return valve MUST BE installed on the cold water line to the solar storage tank AFTER the cold
water branch to a temperature limiting device.
•The solar water heater, including the collector circuit, is to be isolated during the testing and
commissioning of the heated water reticulation system in a building in accordance with Clause 9.3 (a)
of AS/NZS 3500.4:2018. The collector circuit includes the solar hot and solar cold pipes and solar
collectors.

3
CONTENTS
HOUSEHOLDER
This booklet contains important information about your
new water heater, including terms of the Rheem warranty.
We recommend you read pages 7 to 21,
and the terms of the Rheem warranty on pages 4 to 6.
The other pages are intended for the installer but may be of interest.
Warranty....................................................................................................................................... 4
Safety, Warnings, Installation Notes......................................................................................... 7
About Your Water Heater.......................................................................................................... 10
Maintenance Requirements...................................................................................................... 14
Water Supplies........................................................................................................................... 16
Save A Service Call................................................................................................................... 19
Installation –Solar Storage Tank............................................................................................. 22
Installation –Solar Collectors.................................................................................................. 32
System Assembly...................................................................................................................... 35
Connections –Plumbing .......................................................................................................... 47
Connections –Electrical........................................................................................................... 50
Multiple Installations................................................................................................................. 52
Commissioning.......................................................................................................................... 54
Draining And Flushing The Water Heater............................................................................... 56
Installation Report..................................................................................................................... 61
RHEEM AUSTRALIA PTY LTD, A.B.N. 21 098 823 511, www.rheem.com.au
For Service Telephone 131 031 AUSTRALIA

4
RHEEM SOLAR HILINE WATER HEATER WARRANTY
–AUSTRALIA ONLY –
SOLAR HILINE WATER HEATER MODELS 52D180, 52D300
1. THE RHEEM WARRANTY –GENERAL
1.1 This warranty is given by Rheem Australia Pty Limited ABN 21 098 823 511 of 1 Alan Street, Rydalmere
New South Wales.
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 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).
1.3 For details about this warranty, you can contact us on 131031 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 1st October 2019.
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 The decision of whether to repair or replace a faulty component is at Rheem’s sole discretion.
2.2 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.
2.3 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.
2.4 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 office, the cost of transport, insurance and travelling between the nearest branch office or
Rheem Accredited Service Agent’s office and the installed site shall be the owner’s responsibility.
2.5 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.
2.6 This warranty only applies to the original and genuine Rheem water heater in its original installed location
and any genuine Rheem replacement parts.
2.7 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.

RHEEM SOLAR HILINE WATER HEATER WARRANTY
–AUSTRALIA ONLY –
5
SOLAR HILINE WATER HEATER MODELS 52D180, 52D300
e) Repairs, attempts to repair or modifications to the water heater by a person other than Rheem
Service or a Rheem Accredited Service Agent.
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) Breakage of collector glass for any reason including hail damage (we suggest that the collector
glass be covered by your home insurance policy).
l) Ice formation in the waterways of an open circuit thermosiphon system.
2.8 Rheem may reject a claim under this warranty in its sole discretion if a third party solar diverter is
connected to the water heater.
2.9 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.
2.10 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.
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
All components
Year 1
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 & 5
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 solar collector
(all installations)
Years 2 to 5
Replacement solar collector, free of
charge. Installation and repair labour costs
are the responsibility of the owner.

RHEEM SOLAR HILINE WATER HEATER WARRANTY
–AUSTRALIA ONLY –
6
SOLAR HILINE WATER HEATER MODELS 52D180, 52D300
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.
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 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
SAFETY, WARNINGS, INSTALLATION NOTES
It is important you read the following safety and warnings information.
SAFETY AND WARNINGS
•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 the water heater.
•If the electrical conduit to the solar storage tank 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 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 side cover will expose 220 V - 240 V a.c. wiring. It
must only be removed by a qualified person.
•This water heater is supplied with a thermostat, over-temperature 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 relief valves 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 a 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.
•Do not touch any exposed pipe work or fittings connecting the solar storage tank and the solar collectors,
as this may result in a burn injury. Very high temperature hot water and in some circumstances high
temperature steam can be generated by the solar collectors under certain conditions and this flows
through the pipe work from the solar collectors to the solar storage tank.
Note: Any exposed pipe work or fittings in the collector circuit where the installation is in a trafficable area,
such as on an accessible roof, should be attended to and covered with insulation. Phone Rheem Service
or their nearest Accredited Service Agent to arrange for an inspection.
•The water heater under normal use and summer solar conditions should heat the water in the solar storage
tank to 60°C to 75°C. This water temperature can be exceeded and reach up to 95°C during periods of
high solar radiation conditions and reduced hot usage. During times of low solar energy gain or if boosting
of the water temperature is required, an electric heating unit will heat the water temperature to 60°C or up
to 70°C depending upon the thermostat setting.
Refer to “Solar Operation” on page 10 and to “How Hot Should The Water Be?” on page 11.
•For continued safety of this water heater it must be installed, operated and maintained in accordance with
the Owner’s Guide and Installation Instructions.
•Servicing of a water heater must only be carried out by qualified personnel. Phone Rheem Service or their
nearest Accredited Service Agent.
•The lever on the temperature pressure relief valve and expansion control valve 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 8 and “Minor Maintenance Every Six Months” on page 14.
•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.
•This open circuit system does not have freeze protection. The system is not suitable for installation in
areas subject to frost or freeze conditions.

SAFETY, WARNINGS, INSTALLATION NOTES
8
RELIEF VALVES
Temperature Pressure Relief Valve
This water heater incorporates a temperature pressure relief
valve located near the top of the solar storage tank. 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 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 20.
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.
The easing lever on the temperature pressure relief valve and expansion control valve should be operated
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 14.
If the relief valve easing lever is not readily and safely accessible, contact Rheem Service or their nearest
Accredited Service Agent. Do not attempt to climb onto a non-trafficable roof to operate the relief valve lever.
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 solar storage tank cylinder failing, or under certain circumstances, exploding.
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 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 16.
outlet /
drain line
lift until water
flows from the
drain line –
lower gently

SAFETY, WARNINGS, INSTALLATION NOTES
9
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.
▪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.
•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 power supply wires are to be directly connected to the terminal block and earth tab connection,
with no excess wire loops inside the front cover. The temperature rating of the power supply wires
insulation must suit this application, or the wiring protected by insulating sleeving with an appropriate
temperature rating if it can make contact with the internal storage cylinder. The temperature of the
internal storage cylinder can reach 95°C during its operation.
•in compliance with all local codes and regulatory authority requirements.
Installation and commissioning requirements and details for the installing plumber and licensed electrical
worker are contained on pages 22 to 55.
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 and
an expansion control valve with a pressure rating of 850 kPa.
The maximum mains water supply pressure for the water heater is 680 kPa when an expansion control valve
is installed. If the mains supply pressure in your area exceeds this value, a pressure limiting valve must be
installed.
The supply pressure should be greater than 350 kPa for true mains pressure operation to be achieved.

10
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®solar Hiline™water heater is designed for both the solar collectors and the solar storage tank
to be roof mounted. The solar storage tank has a Colorbond®jacket and is suitable for installation with Rheem
NPT 200 solar collectors.
A 52D series system does not have freeze protection. The system is not suitable for installation in areas subject
to frost or freeze conditions. Freeze conditions occur below 6°C. The system has NO WARRANTY for freeze
damage. Refer to “Terms of the Rheem Warranty” on page 4.
This water heater is designed to be installed as an electric boosted solar water heater with its booster heating
unit connected to a power supply, however it may be installed with an in-series continuous flow or storage
booster water heater.
If this water heater is installed with an in-series booster, then the electric booster heating unit will not be
connected to a power supply and the references to the electric booster heating unit, thermostat and boosting
controls in this Guide will not be applicable to the installation. For information relating to the function and
operation of the in-series booster, refer to the Owners Guide and Installation Instructions supplied with the
booster water heater.
SOLAR OPERATION
The solar water heater uses the thermosiphon principle, without
the need for a pump, circulator or sensors. It works on the simple
scientific fact that hot fluid rises. The solar collector’s low-iron
content solar glass allows more solar energy from the sun to pass
through and be used to heat the collector’s absorber plate than
conventional glass. This solar energy heats the water in the
absorber plate which is then transferred to the storage tank.
The Rheem Hiline 52D series system is an open circuit solar water
heater with its vitreous enamel lined solar storage tank installed on
the roof directly coupled to the solar collectors. An open circuit
system has a collector circuit which is directly connected to the
potable water in the solar storage tank by copper pipe work.
As the water in the solar collector gains the solar energy from the absorber, the increase in temperature causes
the water to rise through the collector and the solar hot pipe into the solar storage tank. As the heated water
enters the storage tank, cooler water from the bottom of the solar storage tank flows down the solar cold pipe
into the solar collectors to be heated by the solar energy. This process continues while solar energy is available
and the water in the solar storage tank requires heating.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
ELECTRIC BOOSTING
Water stored in the solar storage tank can be heated by an electric booster heating unit. The booster heating
unit is for heating the water at times of low solar energy gain, such as during very cloudy or rainy weather, or
during the colder months.
The amount of water heated by the raised booster heating unit of the solar Hiline storage tank will be 180 litres
(300 litre model), or 90 litres (180 litre model).
The water heater is more suited for the booster heating unit to be connected to either a continuous, or a time
of use, or an extended Off-Peak (overnight and day) electricity supply. A timer can also be used to control the
boosting periods and help maximise solar savings. Refer to “Booster Control” on page 12.

ABOUT YOUR WATER HEATER
11
The booster heating unit may be connected to an Off-Peak (overnight) electricity supply, however this will only
allow the booster to heat the water overnight. If this type of connection is considered, care must be taken to
ensure there is sufficient boost capacity to meet the household’s full day and night hot water supply during
periods of no or low solar gain, particularly in cold weather. Temperature Redistribution (refer to page 20) is
more evident with this type of electricity supply connection.
The booster heating unit is controlled by an electric thermostat. The thermostat and its over temperature energy
cut out are mounted on the solar storage tank behind the side cover. If required, the water is heated
automatically to the thermostat setting by the booster heating unit when power is available.
HOW HOT SHOULD THE WATER BE?
The temperature the system will achieve under solar heating
depends on many factors, including the level of solar radiation
available, orientation and inclination of the solar collectors,
incoming cold water temperature and volume of hot water used.
Under normal household use and average operating conditions,
the system may achieve a water temperature of approximately
twice the maximum daily outside air temperature.
During periods of low solar energy gain, the water temperature can
be boosted by the thermostatically controlled electric booster
heating unit. Refer to “Booster Control” on page 12. Rheem
recommends the thermostat is set at 60°C to maximise solar
contribution.
Note: AS 3498 requires that a water heater provides the means to
inhibit the growth of Legionella bacteria in potable water. This
water heater can satisfy this AS 3498 requirement provided the
electric booster is energised for a sufficient period each day and
the electric booster thermostat setting is 60°C or higher.
If this water heater is installed with an in-series continuous flow gas booster, then this requirement of AS 3498
can be satisfied provided the booster is energised, its preset outlet temperature setting is 70°C or higher and
a remote temperature controller is not used.
If this water heater is installed with an in-series storage booster, then this requirement of AS 3498 can be
satisfied provided the storage booster is energised and its thermostat setting is 60°C or higher.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver hot water at temperatures which on occasion could exceed 75°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 water heater features a tradesperson adjustable thermostat. This requires a licensed electrical worker to
make any temperature adjustments. The thermostat has a maximum temperature setting of 70°C, a minimum
temperature setting of 60°C and is factory set at 60°C.
We advise you to have a licensed electrical worker adjust the thermostat to the lowest setting which meets
your needs, especially if there are young children or elderly people in the home. Refer to “Hotter Water
Increases the Risk of Scald Injury” on page 11.
typical maximum temperature
from solar gain
maximum booster setting
maximum recommended
supply temperature to
bathrooms and ensuites
minimum booster setting

ABOUT YOUR WATER HEATER
12
BOOSTER CONTROL
An isolating switch is installed in the electrical meter box for the solar storage tank. This should be left switched
on to allow the booster heating unit to operate if required. The booster heating unit is for heating the water at
times of low solar energy gain, such as during very cloudy or rainy weather, or during the colder months. The
booster heating unit will only activate if heating is required and power is available from the switchboard. When
the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The booster
heating unit will automatically turn off when the temperature of the water reaches the thermostat setting.
Leaving the isolating switch switched on will also provide a sufficient period of time each day for the booster
heating unit to operate, if required, to satisfy the requirements of AS 3498.
The amount of water heated by the raised booster heating unit of the solar Hiline storage tank will be 180 litres
(300 litre model), or 90 litres (180 litre model).
Timer Control Switch
A suitably rated timer control switch can be installed and will help maximise energy savings with an electrically
boosted solar water heater connected to a continuous, time of use or extended Off-Peak (overnight and
day) electricity supply. Further information for a licenced electrical worker on the recommended methods of
wiring the timer are outlined in “Booster Control” on page 51.
Programming the Timer
Power must be available to the timer control switch before the booster heating unit can be activated. The timer
control switch should be programmed:
•to suit the hot water consumption pattern of the household,
•with the end of the period to coincide with the commencement of the evening hot water usage,
A second period, such as prior to the morning hot water usage, may be necessary.
•to enable a boosting period of not less than the recommended continuous length of time for boosting, and
•for a period when power will be available to the timer.
Note: When daylight saving time applies, you may consider resetting the timer accordingly.
The recommended continuous length of time for boosting is:
Booster heating unit size
Model
Minimum winter
cold water temperature
Temperature
rise
2.4 kW
3.6 kW
4.8 kW
180
Cool / temperate climate
10°C
50°C
2 ¼ hours
1 ½ hours
1 ¼ hour
Temperate / sub tropical climate
15°C
45°C
2 hours
1 ½ hours
1 hour
Tropical climate
20°C
40°C
2 hours
1 ¼ hours
1 hour
300
Cool / temperate climate
10°C
50°C
3 ¾ hours
2 ½ hours
2 hours
Temperate / sub tropical climate
15°C
45°C
3 ½ hours
2 ¼ hours
1 ¾ hours
Tropical climate
20°C
40°C
3 hours
2 hours
1 ½ hours
The recommended boosting periods are sufficient to allow the booster heating unit to heat up the boost volume
of the solar storage tank to 60°C where the winter cold water temperatures do not fall below those shown. This
may be necessary during periods of very low solar energy gain through the solar collectors, such as during
constant rain or extremely cloudy weather, particularly in winter when the incoming cold water temperature is
lower. The period will also provide a sufficient heat up time for the electric booster to operate, if required, to
satisfy the requirements of AS 3498.
The booster heating unit will only activate if heating is required and power is available from the timer. When
the water is below the thermostat setting, the booster heating unit will turn on and heat the water. The booster
heating unit will automatically turn off either when the temperature of the water reaches the thermostat setting
or at the end of the timer period, whichever comes first.

ABOUT YOUR WATER HEATER
13
PRECAUTIONS
The water heater must be maintained in accordance with the Owner’s Guide and Installation Instructions. Refer
to “Maintenance Requirements” on page 14 and to “Anode Inspection and Replacement” on page 17.
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 a plumber or specifier about your needs and building back-up
redundancy into your hot water supply system.
TO TURN OFF THE WATER HEATER
If you plan to be away from home for a few nights, we suggest you leave the water heater switched on.
If it is necessary to turn off the water heater:
•Switch off the electrical supply at the water heater isolating switch(s) on the switchboard.
•Close the cold water isolation valve at the inlet to the water heater.
TO TURN ON THE WATER HEATER
•Open the cold water isolation valve fully at the inlet to the water heater.
•Switch on the electrical supply at the water heater isolating switch(s) on the switchboard.
•Check and if required reset the timer, if one is installed.
GOING ON HOLIDAYS
If you plan to be away from home, conserve energy by switching the booster switch “OFF”. Refer to “To Turn
Off The Water Heater” on page 13. Also if the system is not used for a period in excess of four (4) weeks it is
recommended the solar collectors be covered.
Care should be taken when returning from holidays and the collectors have not been covered. The water in
the solar storage tank can be very hot.
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 16.
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 16 to 18.
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 13.

14
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.
The minor maintenance includes:
•If readily and safely accessible, 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 8.
If the relief valve lever is not readily and safely accessible, contact Rheem Service or their nearest
Accredited Service Agent. Do not attempt to climb onto a non-trafficable roof to operate the relief valve
lever.
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.
•If readily and safely accessible, 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 8.
If the relief valve lever is not readily and safely accessible, contact Rheem Service or their nearest
Accredited Service Agent. Do not attempt to climb onto a non trafficable roof to operate the relief valve
lever.
MAJOR SERVICE EVERY FIVE YEARS
It is recommended a major service be conducted on the water heater every five (5) years. If an anode
replacement is conducted sooner than a major service, then the major service should coincide with the
replacement.
Warning: Servicing of a water heater must only be carried out by a qualified person. Phone Rheem Service
or their nearest Accredited Service Agent.
Note: The major service and routine replacement of any components, such as the anode and relief valves,
are not included in the Rheem warranty. A charge will be made for this work. Only genuine replacement parts
should be used on this water heater.
The major service includes the following actions:
•Replace the temperature pressure relief valve.
•Inspect and flush the expansion control valve. If required, replace the valve.
•Inspect and if required, replace the anode.
If the anode is not replaced, it should be replaced within three (3) years of this service. Refer to “Anode
Inspection and Replacement” on page 17.
•Drain and flush the solar storage tank of sediment build-up if required.
•Flush the solar collectors.
•Check the booster heating unit for excessive calcium build-up or corrosion and replace if necessary.
•Visually check the unit for any potential problems, e.g. broken glass, excessive dust and dirt build-up,
shading.
•Clean the collector glass.
•Check the condition of the pipe insulation, if fitted, on the solar hot and solar cold pipes. Replace or make
good if required.
•Inspect all connections.

MAINTENANCE REQUIREMENTS
15
Note: The solar storage tank may need to be drained during this service. After the completion of the service,
the solar storage tank will take some time to reheat the water by solar gain. Depending upon the power supply
connection to the booster heating unit, hot water may not be available until the next day.
If a temperature limiting device, water filter or a water softener are installed, their operation should be checked
at this time. These checks are not covered within the major service. Components, devices and valves which
are not part of the water heater, such as a temperature limiting device, water filter and water softener are not
covered by the Rheem warranty.
COLLECTOR GLASS
Ensure the glass on your solar collectors is free of dust, salt spray or any other matter which may reduce the
effectiveness of the solar collectors. Rainfall should keep the collector adequately clean. It is recommended
the collector glass be washed clean at least every three months should adequate rain not have fallen in this
period.
Collector glass can be hosed down or if the solar collectors are accessible such as on a trafficable roof, wash
the collector glass with water and a soft brush when the solar collectors are cool, such as early in the morning.
In extremely dusty areas extra attention may need to be given to keeping the collector glass clean.
Have any trees trimmed which may shade the solar collectors.
Rheem solar collectors have passed the AS/NZS 2712 requirements for resistance to hailstone damage, so it
is not normally necessary to fit a guard to a collector. Stone Guards are available to provide a level of protection
to the collectors against vandalism or accidental damage. Contact Rheem or your local Rheem Solar Water
Heater Distributor for details.
FLUSHING THE SOLAR COLLECTORS
It may be necessary to flush the solar collectors if there is sediment in the water supply. This should be
conducted by a person qualified to do so and in the morning within three (3) hours of sunrise, when the water
temperature inside the solar collectors should be lower.
Warning: Care must be exercised to avoid splashing of water, as water discharged from the solar collectors
and solar storage tank may be of a very high temperature.
It is recommended to have the solar collectors flushed every five (5) years. This will assist in keeping the solar
collectors, solar cold pipe and solar hot pipe clear of sediment.

16
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Rheem
warranty.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies.
However, there are some known water chemistries which can have detrimental effects on the water heater
and its operation and / or life expectancy. If you are unsure of your water chemistry, you may be able to obtain
information from your local water supply authority. This water heater should only be connected to a water
supply which complies with these guidelines for the Rheem warranty to apply.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and / or life expectation of a water heater cylinder, a temperature pressure relief valve, a heating unit, and a
solar collector in an open circuit solar water heater system.
Where there is a changeover from one water supply to another, e.g., a rainwater tank supply, bore water
supply, desalinated water supply, public reticulated water supply or water brought in from another supply, then
water chemistry information should be sought from the supplier or it should be tested to ensure the water
supply meets the requirements given in these guidelines for the Rheem warranty to apply.
ANODE
The vitreous enamel lined cylinder of the water heater is only covered by the Rheem warranty when the total
dissolved solids (TDS) content in the water is less than 2500 mg/L and when the correct colour coded anode
is used. If an incorrect colour coded anode is used in the water heater, any resultant faults will not be covered
by the Rheem warranty. In addition, the use of an incorrect colour coded anode may shorten the life of the
water heater cylinder.
The correct colour coded anode must be selected and fitted to the water heater in accordance with the following
advice and the Anode Selection chart on page 16 for the Rheem warranty to apply to the water heater cylinder.
Total Dissolved Solids
Anode colour code
0 –400 mg/L
Black
400 –600 mg/L
Black or Blue
600 –2500 mg/L
Blue
2500 mg/L +
Blue (no cylinder warranty)
The changing of an anode must be carried out by a qualified person.
Note: Some water analysis reports may state the conductivity of the water rather than the level of total
dissolved solids. Conductivity, measured in microsiemens per centimetre (µS / cm), is directly proportional to
the TDS content of the water. TDS, in mg / L, is approximately 70% of the conductivity in µS / cm.

WATER SUPPLIES
17
ANODE INSPECTION AND REPLACEMENT
The anode installed in this water heater will slowly dissipate whilst protecting the cylinder. The life of the
cylinder may be extended by replacing the anode.
For water supplies which are either softened or desalinated, or where the water supply may alternate between
a water tank and a reticulated public supply or another supply, or where there is a variable supply (e.g. from a
bore or public reticulated supply from various water sources), the anode must be inspected (and replaced if
there is any sign of depletion) within five (5) years of its installation. For known very aggressive water supplies,
the anode should be inspected within three (3) years of its installation.
For all water supplies, if the anode is not replaced during a major service (refer to “Major Service Every Five
Years” on page 14) then the maximum time after installation when the anode should be replaced for this water
heater is eight (8) years.
CAUTION
If the water supply has a TDS greater than 600 mg/L and the black anode has not been changed to a blue
anode, there is the possibility the anode may become overactive and hydrogen gas could accumulate in the
top of the water heater during long periods of no use.
If, under these conditions, the water heater has not been used for two or more weeks the following procedure
should be carried out before using any electrical appliances (automatic washing machines and dishwashers)
which are connected to the hot water supply.
The hydrogen, which is highly flammable, should be vented safely by opening a hot tap and allowing the water
to flow. There should be no smoking or naked flame near the tap whilst it is turned on. Any hydrogen gas will
be dissipated. This is indicated by an unusual spurting of the water from the tap. Once the water runs freely,
any hydrogen in the system will have been released.
SATURATION INDEX
The saturation index is used as a measure of the water’s corrosive or scaling properties. The saturation index
figures stated are calculated using a water temperature of 80°C.
In a corrosive water supply, the water can attack copper parts and cause them to fail.
Where the saturation index is less than –1.0, the water is very corrosive and the Rheem warranty does not
apply to a copper sheathed heating unit or a solar collector in an open circuit solar water heater system. A
corrosion resistant heating unit must be used for the Rheem warranty to apply to the heating unit.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.
Where the saturation index exceeds +0.40, the water is very scaling. An expansion control valve must be fitted
on the cold water line after the non-return valve to protect and for the Rheem warranty to apply to the
temperature pressure relief valve and water heater cylinder. Solar collectors in an open circuit solar water
heater system should be covered when the water heater is not intended to be used for more than four (4)
weeks.
Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a standard watts density
heating unit or a solar collector in an open circuit solar water heater system. A low watts density heating unit
must be used for the Rheem warranty to apply to the heating unit.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the water.
Refer to the Saturation Index chart on page 18.
Contact Rheem Service or their nearest Accredited Service Agent if a replacement heating unit is required.
Refer to the cold water connection detail on page 47 for the position of the expansion control valve.

WATER SUPPLIES
18
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING WARRANTY
The water heater, solar collectors and their components are not suitable for certain water chemistries. Those
chemistries are listed below. If the water heater is connected at any time to a water supply with the following
water chemistry, the Rheem warranty will not cover any resultant faults on the components listed below:
Water Chemistry
Component
Total Dissolved Solids (TDS) > 2500 mg/L
water heater cylinder
Total Dissolved Solids (TDS) not suitable for anode type
water heater cylinder
Saturation Index (SI) < -1.0
solar collector
copper sheathed heating unit
Saturation Index (SI) > +0.4
(if an expansion control valve is not fitted)
water heater cylinder
temperature pressure relief valve
Saturation Index (SI) > +0.8
solar collector
standard watts density heating unit

19
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or fault
that is not related to manufacture or failure of a part.
NOT ENOUGH HOT WATER (OR NO HOT WATER)
This can occur with new installations and is normally related to some misunderstandings as to the use of the
booster heating unit.
•Insufficient sunlight
Insufficient sunlight due to cloudy weather during hotter months or
low solar energy contribution in colder months may mean the
booster heating unit is required to boost more often.
Ensure the booster heating unit is being used as advised.
Refer to “Booster Control” on page 12.
•Booster heating unit not operating
Inspect the isolating switch marked “HOT WATER” or “WATER
HEATER” at the switchboard and ensure it is turned on.
Check the timer (if one is installed) and it’s settings to ensure
power is available to the booster heating unit.
Note: Check the electricity supply to which the unit is connected. If on an Off-Peak or time controlled
electricity supply remember heating hours are restricted.
Check the fuse or circuit breaker marked “HOT WATER” or “WATER HEATER” at the switchboard.
•Collectors shaded
If trees or other objects shade the solar collectors or if the glass is dirty, the effectiveness of the solar
collectors will be greatly reduced. Have the trees trimmed or the solar collectors relocated if the obstruction
is permanent or clean the collector glass.
Refer to “Collector Glass” on page 15.
•Are you using more hot water than you think?
Is one outlet (especially the shower) using more hot water than you think?
Very often it is not realised the amount of hot water used, particularly when showering. Carefully review
the family’s hot water usage. As you have installed an energy saving appliance, energy saving should
also be practised in the home. Adjust your water usage pattern to take advantage of maximum solar gains.
Have a plumber install a flow control valve to each shower outlet to reduce water usage.
•Relief valve running
Is the relief valve discharging too much water?
Refer to “Temperature Pressure Relief Valve or Expansion Control Valve Running” on page 20.
•Thermostat setting
Ensure the thermostat setting is appropriate. You may choose to have a licensed electrical worker check
and adjust the thermostat upwards to gain additional hot water capacity when boosting.
Refer to “Temperature Adjustment” on page 11.
Warning: Hotter water increases the risk of scald injury.
•Water heater size
Do you have the correct size water heater for your requirements?

SAVE A SERVICE CALL
20
WATER NOT HOT ENOUGH
You may find that due to heavy hot water usage or low solar energy gain the water temperature may be lower
than normally expected. Ensure the booster is being used as advised. If a timer is installed, you will need to
carefully plan your use of the booster heating unit to boost the water temperature on such occasions.
Temperature Redistribution: A lower water temperature may be noticed in the morning when the booster
heating unit has not been energised overnight. This temperature reduction is caused by the transfer of heat
energy overnight from the hot water in the upper part of the solar storage tank to the cold water in the lower
part of the solar storage tank. This effect is often perceived as heat loss, but is actually the redistribution of
stored heat more evenly over the entire contents of the solar storage tank. This heat is not lost to the system.
Temperature redistribution is more prevalent the more hot water is used the night before or if the booster switch
or time clock is left off over-night and in particular may be experienced during periods of low solar energy gain,
such as during the cooler months. Temperature redistribution can also occur during days of lower solar
radiation particularly during the cooler months if power to the booster heating element is not available, or the
booster switch or time clock is left off.
If higher temperature water is required, particularly in the morning, then use of the booster heating unit is
necessary to raise the temperature of the water in the top section of the cylinder.
If the water heater is connected to an Off-Peak (overnight) electricity supply, then switching to an Extended
Off-Peak (overnight and day) supply should be considered. If a timer is being utilised, then a timed boost period
in the afternoon prior to the evening usage should be considered.
Refer also to “Booster Control” on page 12.
TEMPERATURE PRESSURE RELIEF VALVE OR EXPANSION CONTROL VALVE RUNNING
•Normal Operation
Itis normal and desirable the temperature pressure relief valve
or expansion control valve allows a small quantity of water to
escape during the heating cycle. This quantity should be equal
to approximately 1/50 of the hot water used, as water expands
by this volume when heated. However, if it discharges more
than a bucket full of water in 24 hours, there may be another
problem.
The expansion control valve will discharge water instead of
the temperature pressure relief valve as it has a lower
pressure rating. A benefit is that energy is conserved as the
discharged water is cooler. This valve is installed in the cold
water line to the water heater (refer to the cold water
connection diagram on page 47).
•Continuous dribble
If readily and safely accessible, try gently raising the easing lever on the relief valve for a few seconds
(refer to “Relief Valves” on page 8). This may dislodge a small particle of foreign matter and clear the fault.
Release the lever gently.
If the relief valve lever is not readily and safely accessible, contact Rheem Service or their nearest
Accredited Service Agent. Do not attempt to climb onto a non-trafficable roof to operate the relief valve
lever.
•Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises above the designed pressure of the water
heater. Ask your installing plumber to fit a pressure limiting valve.
Warning: Never replace the relief valve with one of a higher pressure rating.
•Heavy flows of hot water from the temperature pressure relief valve until water heater is cold -
then stops until water reheats
If this occurs when the water heater is being boosted by the electric booster heating unit, then the water
heater must be switched off at the isolating switch or switchboard. Phone Rheem Service or their nearest
Accredited Service Agent to arrange for an inspection.