Technical data

ABOUT YOUR WATER HEATER
5
WATER OUTLET TEMPERATURE
This water heater has two outlets. One is a hot water outlet and the other is a tempered water outlet. The
purpose of the hot water outlet is to deliver hot water at between 60°C and 75°C, usually for kitchen and
laundry use. The purpose of the tempered water outlet is to deliver water up to 50°C, usually for bathroom or
ensuite use.
The tempered water outlet is from the tempering valve, located under the pipe cover at the front of the water
heater immediately below the gas booster. The tempering valve is the brass valve with a white plastic cap.
The tempering valve mixes hot water from the solar storage tank and gas booster with cold water from the
mains supply and delivers tempered water from its outlet.
The hot water outlet is located above the tempering valve. Depending upon how the water heater was installed,
either both or only one of these outlets may have been plumbed to the hot water pipe work in the premises.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the gas booster has not operated for some time (which is most often first thing in
the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat exchanger
warms up. This is both an energy and water saving feature of this water heater. Once the heat exchanger
has warmed up the hot water flow will increase and remain at normal flow levels. This feature will only occur
at a cold start-up and not when the heat exchanger is already warm from a recent use of hot water.
HOW HOT SHOULD THE WATER BE?
The solar control unit will circulate the closed circuit fluid through the
solar collectors until a temperature of approximately 75°C is reached
in the solar storage tank. During periods of low solar energy gain, the
gas booster will boost the water temperature automatically to its
preset outlet temperature setting when required.
Note: The preset outlet booster temperature setting of the gas
booster cannot be adjusted by the householder. The setting can only
be adjusted by Rheem Service or their nearest Accredited Service
Agent. The factory preset outlet temperature setting of the gas
booster is 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 has an in-series gas booster which can satisfy this AS 3498
requirement provided the gas booster is energised, the booster preset
outlet temperature setting is 70°C or higher and a remote temperature
controller is not used.
Warning: Temperature controllers must not be fitted to an in-series gas booster as part of a solar water
heater system because water at a temperature much higher than the controller setting can be delivered.
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.
The tempered water outlet from this water heater will not deliver temperatures exceeding 50°C, in accordance
with AS 4032.2 There is no statutory requirement to fit a supplementary temperature limiting device after this
outlet 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.
typical maximum
temperature from solar gain
maximum recommended
supply temperature to
bathrooms and ensuites
booster factory preset outlet
temperature setting