Rheem Solar Hiline 52D180 Owner's Manual And Installation Instructions page 5

ELECTRIC BOOSTING
Water stored in the solar storage tank can be heated by an electric booster heating unit. The booster heating
unit is for heating the water at times of low solar energy gain, such as during very cloudy or rainy weather, or
during the colder months.
The amount of water heated by the raised booster heating unit of the solar Hiline storage tank will be 180 litres
(300 litre model), or 90 litres (180 litre model).
The water heater is more suited for the booster heating unit to be connected to either a continuous, or a time
of use, or an extended Off-Peak (overnight and day) electricity supply. A timer can also be used to control the
boosting periods and help maximise solar savings. Refer to
The booster heating unit may be connected to an Off-Peak (overnight) electricity supply, however this will only
allow the booster to heat the water overnight. If this type of connection is considered, care must be taken to
ensure there is sufficient boost capacity to meet the household's full day and night hot water supply during
periods of no or low solar gain, particularly in cold weather.
more evident with this type of electricity supply connection.
The booster heating unit is controlled by an electric thermostat. The thermostat and its over temperature energy
cut out are mounted on the solar storage tank behind the side cover. If heating is required, the water is heated
automatically to the thermostat setting by the booster heating unit when power is available.
HOW HOT SHOULD THE WATER BE?
The temperature the system will operate at under solar heating will
depend upon the level of solar radiation available, orientation and
inclination of the solar collectors, incoming cold water temperature
and volume of hot water used.
Under normal household use and average operating conditions,
the system may achieve a water temperature of approximately
twice the maximum daily outside air temperature.
During periods of low solar energy gain, the water temperature can
be boosted by the thermostatically controlled electric booster
heating unit. Refer to
recommends the thermostat is set at 60°C to maximise solar
contribution.
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 the
electric booster is energised for a sufficient period each day and
the electric booster thermostat setting is 60°C or higher.
If this water heater is installed with an in-series continuous flow gas booster, then this requirement of AS 3498
can be satisfied provided the booster is energised, its preset outlet temperature setting is 70°C or higher and
a remote temperature controller is not used.
If this water heater is installed with an in-series storage booster, then this requirement of AS 3498 can be
satisfied provided the storage booster is energised and its thermostat setting is 60°C or higher.
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.
"Booster Control"
on page 7. Rheem
ABOUT YOUR WATER HEATER
"Booster Control"
on page 7.
Temperature Redistribution
5
(refer to page 16) is
typical maximum temperature
from solar gain
maximum booster setting
minimum booster setting
maximum recommended
supply temperature to
bathrooms and ensuites