Rheem 090 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
Gas Domestic Outdoor
Water Heater
347 Series 090, 135, 170 Models

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.
TRADEMARKS
®Registered trademark of Rheem Australia Pty Ltd.
TM Trademark of Rheem Australia Pty Ltd.
Note: Every care has been taken to ensure the accuracy in preparation of this
publication. No liability can be accepted for any consequences,
which may arise as a result of its application.
Warning: Upon completion of the installation and commissioning of
the water heater, leave this guide with the householder or responsible
officer. DO NOT leave this guide inside of the cover of the water heater,
as it may interfere with the safe operation of the water heater or ignite
when the water heater is turned on.
RHEEM AUSTRALIA PTY LTD A.B.N. 21 098 823 511
www.rheem.com.au
For Service Telephone 131031 AUSTRALIA

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 24,
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..........................................................12
Maintenance Requirements ......................................................16
Water Supplies...........................................................................18
Save A Service Call ...................................................................22
Installation..................................................................................25
Connections –Plumbing ..........................................................34
Commissioning..........................................................................38
Lighting The Water Heater ........................................................39
Draining The Water Heater .......................................................42

4
RHEEM GAS DOMESTIC MAINS PRESSURE
WATER HEATER WARRANTY - AUSTRALIA ONLY
GAS WATER HEATER 347 SERIES 090, 135, 170 MODELS
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
[email protected] (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 after 23rd April 2018.
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.

RHEEM GAS DOMESTIC MAINS PRESSURE
WATER HEATER WARRANTY - AUSTRALIA ONLY
5
GAS WATER HEATER 347 SERIES 090, 135, 170 MODELS
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 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.
2.6 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.
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.
f) Faulty plumbing or faulty gas 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.

RHEEM GAS DOMESTIC MAINS PRESSURE
WATER HEATER WARRANTY - AUSTRALIA ONLY
6
GAS WATER HEATER 347 SERIES 090, 135, 170 MODELS
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 Rheem’s 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
347 series 090, 135, 170 models
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 to 10
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.

RHEEM GAS DOMESTIC MAINS PRESSURE
WATER HEATER WARRANTY - AUSTRALIA ONLY
7
GAS WATER HEATER 347 SERIES 090, 135, 170 MODELS
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.

8
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.
This water heater is supplied with a thermostat, an 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.
Do not modify this water heater.
Do not use or store flammable
materials in or near this water heater.
Flammable liquids (such as petrol),
combustible materials (such as
newspapers) and similar articles must be
kept well away from the water heater and
the flue terminal.
Do not spray aerosols in the vicinity of
this water heater while it is in operation.
Propellants and gases in many aerosol
sprays contain hydrocarbons which are
flammable. Gases from aerosol sprays
may also become corrosive when drawn
into a flame.
Do not store swimming pool chemicals, household cleaners, etc., near the
water heater.
Do not place articles on or against this water heater, or in contact with the
flue terminal. Ensure the flue terminal is not obstructed in any way at any
time.
Do not use Propane / Butane gas mixtures in a Propane model. A Propane
model is designed to operate on Propane only. The use of Propane / Butane
mixture, such as automotive LP gas fuel, in a Propane model is unsafe and
can cause damage to the water heater.

SAFETY, WARNINGS, INSTALLATION NOTES
9
The water heater will operate until a water temperature of up to 73°C is
reached, depending upon the thermostat setting.
Refer to “How Hot Should The Water Be?” on page 12 and “Temperature
Adjustment” on page 13.
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 16.
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.
Only a person qualified to install or service a water heater can drain the water
heater, if this is required.
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 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.

SAFETY, WARNINGS, INSTALLATION NOTES
10
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 23.
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 16.
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.
Warning: Failure to operate the easing lever on the relief valve once every
six (6) months may result in the water heater cylinder failing.
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 18.
lift until water
flows from the
drain line –
lower gently
drain
line

SAFETY, WARNINGS, INSTALLATION NOTES
11
INSTALLATION NOTES
This water heater must be installed:
by a qualified person,
in accordance with the installation instructions,
in compliance with the Plumbing Standard AS/NZS 3500.4,
This water heater is suitable 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.
in compliance with the Gas Installations Standard AS/NZS 5601.1,
in compliance with all local codes and regulatory authority requirements.
Installation and commissioning requirements and details for the installing
plumber are contained on pages 25 to 41.
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 1400 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
1200 kPa.
The maximum mains water supply pressure for the water heater is 1120 kPa if
an expansion control valve is not installed, or 960 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.
Securing of the water heater
The top of the water heater is to be secured to the wall or screen with the wall
brackets provided using fasteners suitable for the wall or screen type and
application. Refer to “Wall Brackets”on page 28 for additional information.

12
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
The Rheem®water heater model you have
chosen is suitable for outdoor installation only.
The model is a 347 series Rheemglas®4 star
gas water heater.
Water is stored in a vitreous enamel lined steel
cylinder and heated by a gas burner located
under the cylinder. The heat produced by the
burner is transferred to the water through the
base of the cylinder and through the wall of a
flue pipe which passes through the centre of
the cylinder. A flue baffle in this flue ensures
the efficiency of the water heater is correct. The
gas supply to the burner is controlled by the
thermostat so the water is heated to a constant
temperature.
Automatic safety controls are fitted to the water
heater to provide safe and efficient operation.
HOW HOT SHOULD THE WATER BE?
The water heater features a user adjustable
thermostat, which allows you to personally
choose the most suitable temperature for your
hot water needs. Refer to “Temperature
Adjustment” on page 13.
To meet the requirements of the National
Plumbing Standard the temperature of the
stored water must not be below 60°C.
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 it is operating and the thermostat setting is 60°C
or higher, including when it is used as an in-series booster water heater for a
solar water heater.
maximum thermostat
setting
maximum
recommended supply
temperature to
bathrooms and
ensuites
minimum
recommended stored
water temperature

ABOUT YOUR WATER HEATER
13
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can cause scalding.
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 temperature adjusting dial is on the gas
valve, located behind the access cover on the
lower front of the water heater. A setting of ‘5’
will normally maintain the water temperature
at about 60°C. Each number represents a
temperature difference of approximately 6°C.
To increase the water temperature to 66°C or
73°C, turn the gas control knob anticlockwise
to a setting of ‘6’ or ‘7’ respectively. Refer to
“Hotter Water Increases the Risk of Scald
Injury” on page 13.
PIEZO IGNITION
The “Piezo” push button igniter makes lighting
the pilot flame of your water heater very easy.
Simply follow the instructions on the label
attached to the back of the access cover.
There is no need for matches to light the
water heater.
PILOT IGNITER
A permanent pilot flame burns to ignite the
main burner automatically. Heat from the pilot
is absorbed by the water.

ABOUT YOUR WATER HEATER
14
PRECAUTIONS
The water heater must be maintained in accordance with the Owner’s Guide and
Installation Instructions. Refer to “Maintenance Requirements” on page 16 and
to “Anode Inspection and Replacement” on page 19.
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 it is necessary to turn off the water heater:
Shut down the gas control (refer to “Close Down Procedure” on page 41).
Close the gas isolation valve at the inlet to the gas control.
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.
Open the gas isolation valve fully at the inlet to the gas control.
Light the water heater (refer to “Lighting the Water Heater” on page 39).
GOING ON HOLIDAYS
If you are going on holiday for more than a few days the thermostat can be set
to the “” (pilot) position to conserve energy (refer to point 1 of “Close Down
Procedure” on page 41). If it is necessary to turn off the water heater, refer to “To
Turn Off The Water Heater” on page 14.
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Plumbing Industry Commission.
This water heater must be installed by a licensed person as required by the
Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that the
work complies with all the relevant Standards. Only a licensed person will have
insurance protecting their workmanship for 6 years. Make sure you use a
licensed person to install this water heater and ask for your Compliance
Certificate.

ABOUT YOUR WATER HEATER
15
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 18.
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 18 to 21.
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 14.

16
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:
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 (if fitted). It is very
important the lever is raised and lowered gently. Refer to “Relief Valves”
on page 9.
SERVICE EVERY TWELVE MONTHS
For safe and efficient operation, it is recommended a service be conducted on
the water heater every twelve (12) months.
Warning: Servicing of a water heater must only be carried out by qualified
personnel. Phone Rheem Service or their nearest Accredited Service Agent.
Note: The service and routine replacement of any components, if required, 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 annual service includes the following actions:
Inspect and flush the temperature pressure relief valve.
Inspect and flush the expansion control valve (if fitted).
Check and if necessary adjust the inlet gas pressure.
Check the piezo igniter, gas control and thermocouple.
Check the operation of and clean the pilot light and main burner.
Visually check the unit for any potential problems.
Inspect all connections.

MAINTENANCE REQUIREMENTS
17
MAJOR SERVICE EVERY FIVE YEARS
It is recommended a major service be conducted on the water heater every
five (5) years.
Warning: Servicing of a water heater must only be carried out by qualified
personnel. Phone Rheem Service or their nearest Accredited Service Agent.
Note: The major service and routine replacement of any components, such as
an anode and relief valve(s), 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 fitted). If required, replace
the valve.
Inspect and if required, replace the anodes.
If an anode is not replaced, it should be replaced within five (5) years of this
service (refer to “Anode Inspection and Replacement” on page 19).
Check and if necessary adjust the inlet gas pressure.
Check the piezo igniter, gas control and thermocouple.
Check the operation of and clean the pilot light and main burner.
Visually check the unit for any potential problems.
Inspect all connections.
Note: The water heater may need to be drained during this service. After the
completion of the service, the water heater will take some time to reheat the
water. Hot water may not be available for a while.

18
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.
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 19 for the Rheem warranty to apply to the water heater cylinder.
Total Dissolved Solids
Anode colour code
0 –40 mg/L
Green
40 –150 mg/L
Green or Black
150 –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 anodes 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
19
ANODE INSPECTION AND REPLACEMENT
The anodes installed in your water heater will slowly dissipate whilst protecting
the cylinder. The life of the cylinder may be extended by replacing the anodes.
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), each anode must be inspected
(and replaced if there is any sign of depletion) within five (5) years of its
installation, and within every three (3) years thereafter.
For all water supplies, if the anodes are not replaced during a major service (refer
to “Major Service Every Five Years” on page 17) then the maximum time after its
installation when the anodes should be replaced for this water heater is
ten (10) years.
CAUTION
If the water supply has a TDS greater than 150 mg/L and a green anode has not
been changed to a black anode, or if the TDS is greater than 600 mg/L and the
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.
(3570)
Green
150
2500
600
400
TOTAL DISSOLVED SOLIDS (TDS) mg/L
(CONDUCTIVITY - μS/cm)
(215)
(570)
(860)
Black
40
(60)
Blue
Blue
ANODE SELECTION
above
2500 mg/L (3570 μS/cm),
no warranty applies to a
vitreous enamel lined
water heater cylinder
warranty applies to a vitreous enamel lined
water heater cylinder if the correct coloured anode
is used for the TDS / conductivity level of the water

WATER SUPPLIES
20
SATURATION INDEX
The saturation index (SI) 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.
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.
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 20.
Refer to the cold water connection detail on page 34 for the position of the
expansion control valve.
corrosive
SATURATION INDEX
(calculated @ 80°C water temperature)
very corrosive very scaling
scaling
-1.0
WITHIN WARRANTY
SPECIFICATION
+0.8
SATURATION INDEX (SI)
GAS STORAGE WATER HEATERS
+0.4
no warranty applies to a:
temperature pressure relief
valve or a water heater
cylinder unless an expansion
control valve is fitted.
0