ABOUT YOUR WATER HEATER
5
MAINS PRESSURE
The water heater is designed for direct connection to the mains water supply. If the mains supply pressure in
your area exceeds that shown on page 17, a pressure limiting valve must be fitted. The supply pressure
should be greater than 140 kPa for the rated flow and performance to be achieved.
HOW HOT SHOULD THE WATER BE?
The water heater has a maximum preset outlet temperature setting
of 82°C. For applications requiring sanitising temperatures, the
outlet temperature should be set at 82°C. The minimum
recommended preset outlet temperature setting is 60°C.
If the water heater is installed as part of a circulated hot water flow
and return system in a building, the preset outlet temperature setting
of the water heater must be set to at least 60°C.
If a controller is not installed, the water heater heats the water to the
preset outlet temperature setting. The factory preset outlet
temperature setting is:
872 series 60°C for a single water heater
60°C as part of a Multipak® system
70°C as part of a Commpak® system
Note: The preset outlet temperature setting of this water heater
cannot be adjusted by the householder. The setting can only be
adjusted by the installer, Rheem Service or their nearest Accredited
Service Agent.
Note: AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. When this water heater is used as an in-series booster for a solar water heater it can satisfy
this AS 3498 requirement provided it is energised, the booster preset outlet temperature setting is 70°C or
higher, and that a remote temperature controller is not used.
Warning: Temperature controllers must not be fitted to this water heater (872 series) if it is installed as
an in-series gas booster with a solar water heater system or if a Water Star water heater is installed,
because water at a temperature much higher than the controller setting can be delivered. If a solar or
Water Star water heater is installed to an existing water heater installation, then all controllers must be
disconnected and removed.
If this water heater is installed as part of a solar water heater system, the system can deliver water at
temperatures from 58°C up to 80°C and possibly higher depending upon the model of solar water heater
installed.
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 be required by regulations that an approved temperature limiting device be fitted
into the hot water piping to ablution, bathing and public areas when an 872 series 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 if no controllers are installed and the preset outlet temperature setting
has not been adjusted below 55°C or if a Kitchen controller is installed, still allow hotter water to the kitchen,
laundry and other areas requiring sanitising temperatures.
maximum preset outlet
temperature setting (82°C)
maximum recommended
supply temperature to
bathrooms, ensuites and
public areas.
minimum recommended preset
outlet temperature setting
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