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4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water. Its use in an application other than this
may shorten its life.
MODEL TYPE
The Rheem
®
Heavy Duty Gas water heater model you have chosen is
either a 265 litre or 275 litre indoor or outdoor quick recovery 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.
MAINS PRESSURE
The water heater is designed to operate at mains pressure by connecting directly to the mains water supply.
If the mains supply pressure in your area exceeds that shown on page 18, a pressure limiting valve must be
fitted. The supply pressure should be greater than 350 kPa for true mains pressure operation to be achieved.
HOW HOT SHOULD THE WATER BE?
The water heater has a maximum temperature setting of 82°C and a
minimum temperature setting of 60°C. Refer to “Temperature
Adjustment” on page 5.
For applications requiring sanitising temperatures, the thermostat
should be set at 82°C. Note: For temperatures above 80°C, a circulator
must be installed.
To meet the requirements of the National Plumbing Standard the
temperature of the stored water must not be below 60°C.
If this water heater is installed as an in-series booster water heater as
part of a commercial solar water heating system, to maximise solar
contribution it is recommended the thermostat is set at 60°C, unless
sanitising temperatures are required.
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.
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 bathing and public areas when this water heater is installed. This will
keep the water temperature below the maximum permitted by AS/NZS 3500.4 to these areas. The risk of scald
injury will be reduced and still allow hotter water to the kitchen, laundry and other areas requiring sanitising
temperatures.
maximum thermostat
setting (82°C)
minimum recommended
stored water temperature
and minimum
thermostat setting
maximum recommended
supply temperature to
bathrooms, ensuites and
public areas
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