Rheem Water Heater - Manual (Page 11)

HOW YOUR WATER HEATER WORKS
11
It is important to ensure the booster switch is turned OFF after you have
satisfied your hot water needs. Do not leave the booster switch ON in daylight
hours because your solar savings will be reduced.
b) Extended Off-Peak (overnight and day) Tariff Connection
Operation is very similar to that suggested for continuous tariff, but it is
important to be aware of the hours during which electricity is available so
boosting, if required, can be adapted to suit (check with your local Electricity
Supply Authority for hours of operation).
Do not leave the booster switch on during daylight hours unless boosting is
required, as solar savings will be reduced.
“ONE SHOT CONTROL” SWITCH
The “One Shot Control” switch will help provide maximum savings with an
electrically boosted solar water heater connected to a continuous electricity
supply. Power must be available to the “One Shot Control” switch before the
booster heating unit can be activated.
The switch has a push button
operation and incorporates an indicator
light. Refer to the manufacturer’s
instructions supplied with the “One
Shot Control” switch for information on
how the indicator light arrangement
works.
When you decide the hot water is
below a usable temperature and
additional hot water is required, press
the control button. The booster heating
unit will be turned “ON” if the water
temperature is below the thermostat
setting, then automatically turn “OFF”
when the water temperature reaches
the thermostat setting.
It is not necessary to activate the booster heating unit every time the light
indicates that boosting may be required. The water may still be at a usable
temperature for some purposes (e.g. showering) and you may not need to use
hot water for some hours during which time the water may be heated by the
sun.