316581D-10
JULY 2010
INSTALLATION INSTRUCTIONS
&
OWNERS GUIDE
RHEEM MAINS PRESSURE ELECTRIC
HOT WATER HEATERS
Congratulations for choosing a
Rheem Water Heater
It is important that you take a few minutes
to read this booklet as it may save you
time and trouble later.
If you require any further information or your
water heater needs to be serviced, please contact the
Rheem Service Department on 0800 657 335,
or the nearest service centre
(look in the Yellow Pages under Plumbers)
Important to the Installer
Do not leave this booklet inside the element cover
after installation
Please leave the booklet with the water heater‟s owner
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IMPORTANT INFORMATION
GENERAL

The information contained in this manual, and all other information or advice given at any time
by Rheem New Zealand Limited in connection with the purchase, installation or use of a Rheem
water heater, is given in good faith. Subject to any rights the owner may have under the
“Consumer Guarantees Act 1993”, Rheem New Zealand Limited will not be liable to any person
for any inaccuracy or omission in the information or advice arising through the fault or negligence
of Rheem New Zealand Limited or any other person or through any other cause whatsoever.

This water heater is not intended to be operated, adjusted or tampered with by young children or
infirm persons. Young children should be supervised to ensure they do not play with the water
heater.
Q.
DOES THE WATER QUALITY AFFECT THE WATER HEATER?
Your water heater is suitable for most public water supplies, however, some water qualities may
have a detrimental effect on it. If you are in a known harsh water area please read page 7.
HOW HOT SHOULD THE WATER BE?
The Optima features a user adjustable thermostat (temperature range of 60 – 75 C), which
allows you to choose the most suitable temperature for your hot water needs.
The Rheemglas models (temperature range 60 - 70 C) require an authorised person to make
any temperature adjustments.
For reasons of safety and economy, we advise the thermostat is adjusted to the lowest setting
that meets your needs.
The New Zealand Building Code requires a temperature setting of not less than 60 C.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Refer to the installation requirements on page 4.
HOW LONG WILL THE WATER HEATER LAST?
There are a number of factors that affect the life of the water heater. These include; the water
quality, water pressure, water temperature and the usage pattern, however, your Rheem water
heater is supported by a comprehensive warranty (refer to page 8).
The life of the water heater may be extended by arranging for an authorised person to inspect
the anode and replace it, if required.
The suggested time after installation when the anode should be inspected is:
Rheemglas
8 years
Optima
10 years
For softened water supplies or in areas of poor water quality, it is recommended the anode be
inspected 3 years earlier than shown (refer to "Water Quality" on page 7).
ABOUT YOUR WATER HEATER
A.
Q.
A.
Q.
A.
Q.
A.
HOW THE WATER HEATER WORKS
SINGLE AND TWIN ELEMENT MODELS
Water stored within the water heater is heated by the electric heating element. The thermostat controls
the electricity supply to the heating element so that a constant water temperature is maintained. As the
cold water is heated it expands approximately 1/50 of its volume and, as a result, a small amount of
water is discharged from the cold water expansion valve.
NON-SIMULTANEOUS ELEMENT MODELS
The two heating elements are wired for non-simultaneous operation, so that only one heating unit can
operate at a time. The bottom heating unit is usually connected to an off-peak (overnight) supply and
the top heating unit to a continuous supply. The red link wire must be removed from the terminal
block during installation if two separate power supplies are to be used. Leaving the link in place
ensures both elements operate correctly with a single power supply.
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The basic operation is as follows: when the water temperature at the top of the water heater has
reached the set temperature, the thermostat switches the top element off. This creates a circuit to the
bottom heating element by switching the neutral.
SAFETY
On all models, a Temperature and Pressure Relief valve is supplied with each water heater. It can be
found inside the front cover and must be mounted on top of the water heater.
Also fitted to the water heater is a thermostat, which incorporates an over-temperature thermal cut-out
device.
WARNING: The operation of the thermal cut-out indicates a possible dangerous situation. Do not reset
the thermal cut-out until the water heater has been serviced by an authorised service person.
These safety devices must not be tampered with, or removed, and under no circumstances operate the
water heater unless both devices are fitted.
REGULAR CARE
MANUALLY OPERATING THE TEMPERATURE AND PRESSURE RELIEF VALVE:
Valve manufacturers recommend that you operate the easing lever (see diagram. 1) on the
Temperature and Pressure Relief valve once every six months. It is very important that you raise
and lower the lever gently.
WARNING: To ensure the relief valve is working correctly, operate the relief valve easing lever at least
every six months. Failure to do this may result in the water heater bursting.
DIAGRAM 1
Lift until
water flows
from the
drain line –
lower gently
If water does not flow freely from the
drain line or the valve fails to
completely close and water continues
to be discharged, contact the Rheem
Service Department, phone 0800 657
335, or the nearest Rheem Service
Centre (look in the Yellow Pages
under “Plumbers).
Drain line
Water Heater
GOING ON HOLIDAYS:
If you plan to be away from home for one or two nights, we suggest that you leave the water heater
switched on. However, if you plan to stay away more than a few nights, conserve energy by switching
the water heater off at the isolating switch, or at the main switchboard. In locations where freezing
could occur, you should leave the water heater turned on.
SAVE A SERVICE CALL
CHECK THE ITEMS BELOW BEFORE MAKING A SERVICE CALL. YOU MAY BE CHARGED FOR
SERVICE IF THE FAULT IS NOT RELATED TO THE WATER HEATER MANUFACTURE OR
PARTS SUPPLIED WITH THE WATER HEATER BY RHEEM.
WATER DISCHARGING FROM EXPANSION CONTROL VALVES
It is normal for the cold water expansion valve and the temperature and pressure relief valve to
discharge a small quantity of water during the heating cycle. If either of these valves discharge more
than a bucket full of water in 24 hours, one of the following may be the cause.


Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds. This may dislodge small
particles of foreign matter and clear the fault.
Heavy flow of hot water until the water is cold – then stops while the water reheats
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Immediately turn off the electricity supply to the water heater. Call the Rheem Service
Department or look in the Yellow Pages under “Plumbers” for your nearest Rheem Service
Centre to arrange an inspection.

A steady flow of water (often at night)
This may indicate that your cold water pressure sometimes rises above the design pressure of
the water heater. A Pressure Limiting valve should be installed, or if one is installed, it may need
replacing.
NOT ENOUGH HOT WATER (or no hot water)

Is the electricity turned on?
Check the switch marked „water heater‟ at the switchboard and the water heater isolating switch.
Check the fuse marked „water heater‟.
WHERE THE WATER HEATER IS CONNECTED TO AN OFF PEAK (NIGHT RATE) ELECTRICAL
TARIFF, THE SUPPLY MAY NOT BE AVAILABLE AT CERTAIN TIMES OF THE DAY.

Do you have the correct size heater for your requirements?
Refer to the sizing guide in the Rheem sales literature or the Rheem website.

Is one outlet (especially the shower) using more hot water than you think?
Carefully review the family‟s hot water usage and if necessary, check the shower flow rate.
For maximum efficiency we recommend the flow rate through the shower is between 8 to 10
litres per minute. This can be achieved by installing a flow control valve if provision is not made
to fit a flow restrictor in the shower rose.

Ensure the thermostat setting is appropriate.
HIGH ELECTRICITY BILLS

Is one outlet (especially the shower) using more hot water than you think?

Is there a leaking hot water pipe, dripping hot water tap, etc?
Even a small leak will waste a surprisingly large quantity of hot water and energy. Replace faulty
tap washers, and have your plumber rectify any leaking pipe-work.

Is either of the expansion valves discharging too much water?

Consider recent changes to your hot water usage pattern and check if there has been an
increase in tariffs since your previous account.
INSTALLATION
Please take careful notice of the advice given as Rheem New Zealand Limited will not be liable for any
loss or damage suffered as a result of the incorrect installation of the water heater, or any failure to
check the capability of the electrical supply, wiring to the water heater.
The water heater must be installed by an authorised service person or registered plumber and the
installation must comply with the New Zealand Building Code, Rheem Installation Instructions,
AS/NZS 3000 electrical installations and all local codes and regulatory authority requirements.

WATER HEATER LOCATION
Water heaters with a galvanised outer casing are only suitable for indoor installations, whereas
water heaters with a painted casing are suitable for both indoor and outdoor installations.
Clearance must be allowed for servicing and removal of the water heater and it must be
accessible without the use of a ladder or scaffold. (Typical clearances are: TPR valve removal
135 mm, Element Cover and Element Removal 400 mm). Also, you must be able to read the
information on the rating plate and if possible, leave headroom of one water heater length so the
anode can be inspected or replaced.

CONNECTION SIZES
Hot water connection: RP ¾/20.
Cold water connection: RP ¾/20.
Relief valve connection: RP ½/15.

INLET/OUTLET CONNECTIONS
A union must always be provided at the cold water inlet and hot water outlet for disconnection
reasons. Both connections are fitted with plastic liners and it is important that they remain in situ
for the water heater to function properly. These liners will be pushed into the correct position as
the fitting is being screwed in.
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
NON RETURN VALVE
A non return valve must be installed on the cold water line to the water heater.

PIPE SIZES
The cold water line to the water heater should be the same size or bigger than the hot water line
from the water heater. For best results, choose the most suitable pipe size for each individual
application.

COLD WATER EXPANSION VALVE
A cold water expansion valve must be fitted to the cold water line to the water heater.

TEMPERATURE AND PRESSURE RELIEF VALVE
When fitting the temperature and pressure relief valve, ensure the probe has not been bent. Seal
the thread with PTFE tape, or similar, as recommended by the valve manufacturer and screw the
valve into the off-centre socket. Do not use a wrench on the valve body – use the spanner flats
provided. Drain the TPR valve with a pipe the same size as the valve outlet. The drain must run
downwards to a visible point outside the house, preferably over a gully trap.
In locations where the pipe exceeds 3 metres unbroken length, or freezing could occur, an air
break must be provided within 300 mm of the TPR valve.
WARNING: The drain line from the TPR valve must be in copper. A Rheem mains pressure water
heater must not be installed and operated without a suitable (valve that complies with AS 1357.1)
temperature and pressure relief valve. Under no circumstances block the outlet of this valve or its drain
pipe.
DIAGRAM 2:
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
PRESSURE LIMITING/REDUCING VALVE
If the water supply pressure exceeds the rated pressure, a pressure limiting or reducing valve is
to be fitted in the installation.
The water heater must be installed with a properly drained safe tray where there is the possibility of
water damage to furniture, carpets or building. All water heaters must be restrained to protect against
seismic forces. (Refer to the Zealand Building Code for acceptable solutions.)
CONNECTIONS - ELECTRICAL
The electrical installation must be completed in accordance with AS/NZS 3000. All water heaters are
designed for 230 VAC, 50 Hz mains operation and a means of disconnection from the power supply
must be incorporated in the fixed wiring during installation.
A flexible 20 mm conduit is required for the electrical cable to the water heater. The conduit is to be
connected to the unit with a 20 mm plain to screw adaptor. Connect the power supply wires directly to
the terminal block and earth tab connection, ensuring there are no excess wire loops inside the front
cover. For details, refer to the wiring diagram on the inside of the element cover. A separate heating
element earth wire is not required because the element earths by the thread of the element
boss or the flange being in contact with the element socket.
COMMISSIONING
TO FILL AND TURN ON THE WATER HEATER
The power supply to the water heater must not be switched on until the water heater is filled
with water and a satisfactory Megger reading is obtained.

Open all of the hot water taps in the house (don't forget the shower). Open the cold water
isolation valve fully to the water heater to force the air out of the taps. As water flows freely from
each tap, close it. Check the pipe-work for leaks.

Switch on the electrical supply at the isolating switch to the water heater.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater on completion of the installation, such as on a building site
or where the premises is vacant, then;


Switch off the electrical supply at the isolating switch to the water heater.





Switch off the electrical supply at the isolation switch to the water heater.
Close the cold water isolation valve at the inlet to the water heater.
DRAINING THE WATER HEATER
Close the cold water isolation valve.
Operate the relief valve easing lever to release the pressure in the water heater.
Drain the water heater through the drain valve or plug.
Undo the top outlet union or operate the relief valve easing lever again to let air into the water
heater and allow the water to drain.
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WHAT YOU SHOULD KNOW ABOUT WATER QUALITY
Your Rheem water heater is manufactured to suit the water condition of most local authority water
supplies. However, some water supplies can have a detrimental effect on the water heater and its
operation and/or life expectancy. If you are unsure of your water quality, you can obtain information
from your local water supply authority.
HARSH WATER AREAS
Rheem water heaters are designed for use in areas where the Total Dissolved Solids (TDS) content of
the water supply is less than 2500 mg/L.
In areas where the TDS exceeds 600 mg/L it is possible the standard magnesium anode fitted to the
water heater, may be excessively active. To alleviate this, the magnesium anode should be replaced
with an aluminium anode. Where the TDS of the water is less than 40 mg/L, such as when the water
has been deionised or is from an alpine supply, a high potential anode should be used. The changing
of anodes must be carried out by a plumber or qualified service person.
CAUTION
If your water supply has a TDS greater than 600 mg/L and the anode has not been changed, there is a
possibility of hydrogen gas accumulating 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 (e.g. 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 flames near the tap whilst it is turned on. Any
hydrogen gas will be dissipated as indicated by an unusual spurting of the water from the tap. Once
the water runs freely again 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. In a scaling
water supply calcium carbonate is deposited out of the water onto any hot metallic surface. When
scaling water has a saturation index greater than +0.40 an expansion control valve must be fitted on
the cold water line after the non-return valve.
Where the saturation index exceeds +0.80, low watts density elements should be used. Where the
saturation index is less than -1.0, a corrosive resistant heating unit should be used (contact your local
Rheem Service Department or an authorised service person).
WATER HEATERS NOT INSTALLED IN ACCORDANCE WITH THE ABOVE ADVICE WILL NOT
BE COVERED BY THE RHEEM WARRANTY.
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WARRANTY
In addition to your legal rights, Rheem New Zealand Limited makes the following promise to the owner. We will repair or,
if necessary, replace a defective domestic water heater or part, which has failed due to faulty manufacture on the
following terms and conditions:
Component
All
Components
Except Inner
Cylinder
Inner
Cylinder
Installation
All Installations
Water heater installed in a
single-family domestic
dwelling with a thermostat
setting below 76 C
Water heater installed in
any other than a single
family domestic dwelling
with a thermostat setting
below 76 C
Model
Warranty Period
(since installation)
Warranty
All Models
First 12 Months
New component or water heater (at Rheem’s sole discretion)
free of charge, including labour
Optima
First 3 years
New component or water heater (at Rheem’s sole discretion)
free of charge, including labour
Rheemglas
&
Calorifier
First 3 years
New water heater free of charge, including labour
Years 4 & 5
New water heater free of charge, with installation and labour
costs the responsibility of the owner
Optima
First 5 years
New water heater free of charge, including labour
Years 6 – 10
New water heater free of charge, with installation and labour
costs the responsibility of the owner
New water heater free of charge, including labour
Rheemglas
&
Calorifier
First 12 months
Years 2 & 3
New water heater free of charge, with installation and labour
costs the responsibility of the owner
Optima
First 12 months
New water heater free of charge, including labour
New water heater free of charge, with installation and labour
costs the responsibility of the owner
Years 2 – 5
DURABILITY
Your Rheem water heater meets the durability requirements of New Zealand Building Code provided the water heater is:
1. Installed in accordance with the New Zealand Building Code and the Rheem Installation Instructions.
2. Maintained in accordance with these instructions.
3. Not damaged in any way.
4. Stored correctly prior to use, and
5. Your water quality remains within the requirements stated in the Installation Instructions.
WARRANTY CONDITIONS
1. The water heater must be installed and maintained in accordance with the Rheem Installation Guides supplied with the water heater, and comply fully with all the
requirements of the New Zealand Building Code.
2. The warranty applies to the faulty manufacture of the water heater only and does not cover any plumbing, gas fitting or electrical parts supplied by the installer,
that are not an integral part of the water heater, e.g. pipe-work, pressure limiting valve, stop valves, non-return valves, electrical switches, pumps and fuses.
WARRANTY INFORMATION
WARRANTY EXCLUSIONS:
The Rheem Warranty does not cover repair or replacement work to the water heater or its components caused directly or indirectly by:
1. Accidental damage
2. Acts of God
3. Failure due to misuse
4. Incorrect installation
5. Attempts to repair the water heater, other than by a Rheem Authorised Service Centre, or the Rheem Service Department
6. Excessive water pressure, negative pressure or excessive heat input
7. Non compliance with a) the Rheem Installation Instructions, b) relevant statutory regulations, c) New Zealand Building Code requirements.
This warranty does not include any additional costs, for removing a heater where dismantling or removal of other materials is required, that is, walls, doors
or roofs. Rheem New Zealand Limited will not pay claims for damage to furniture, carpets, walls, foundations or any other consequential loss either directly
or indirectly due to leakage or other causes from a water heater.
Repairs to the water heater due to chemical/scale formation in waterways when the heater has been connected to a harmful water supply as outlined on
page 7 of the owners manual.
Service under this warranty can be provided by a RHEEM AUTHORISED SERVICE CENTRE.
Such services will be provided during their normal business hours.
Additional mileage and cartage charges shall be made for any water heater installed in a location exceeding 25km from the nearest Rheem Service
Centre.
Note:
You may have other rights in addition to this warranty under the “Consumer Guarantees Act 1993”.
RHEEM SERVICE DEPARTMENT, 475 Rosebank Road Avondale, Auckland Phone: 0800 657 335, Fax: 09 829 0222
Or consult the Yellow Pages under “Plumbers” for your nearest Rheem Authorised Service Centre
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