Mains Pressure; How Hot Should The Water Be? - Rheem 18 Owner's Manual & Installation Instructions

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
should be greater than 140 kPa for the rated flow and performance to be achieved.

HOW HOT SHOULD THE WATER BE?

The water heater may be installed with one or more user
adjustable temperature controllers, which allow you to
choose the most suitable temperature for your hot water
"Temperature Control"
needs (refer to
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:
874 series 60°C
876 series 48 C
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, your nearest Rheem
Service Department or their Accredited Service Agent.
If this water heater is installed as part of a solar water heater
system, the installer has checked and if required, adjusted
the preset outlet temperature setting of an 874 series water
heater to 60 C.
Warning: Temperature controllers must not be fitted to this water heater (874 series) as part of 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 preheater or a Water Star water heater has been
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 75 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 the bathroom and ensuite when an 874 series 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 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 and laundry.
An 876 series water heater will not deliver temperatures exceeding 50 C, in accordance with AS 3498. There
is no requirement in AS/NZS 3500.4 to fit a temperature limiting device if this water heater is installed in
other than an early childhood centre, school, nursing home or a facility for young, aged, sick or disabled
people.
44, a pressure limiting valve must be fitted. The supply pressure
on page 9).
5
ABOUT YOUR WATER HEATER
maximum Kitchen controller
temperature setting 874 series
maximum recommended supply
temperature to bathrooms and
ensuites.
maximum Bathroom controller
temperature setting 874 series
maximum Kitchen and Bathroom
controller temperature setting
876 series
minimum Kitchen and Bathroom
controller temperature setting