Rheem Optima Owner's Manual And Installation Instructions page 5

ABOUT YOUR WATER HEATER
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 an Optima water heater is installed.
This will keep the water temperature below 55°C at the bathroom and ensuite.
The risk of scald injury will be reduced and still allow hotter water to the kitchen
and laundry.
THERMOSTAT
The thermostat automatically controls the electricity supply to the heating unit
so a constant temperature is maintained. The thermostat and its protective over
temperature cut out is mounted inside the front cover of the water heater. There
is no need to switch the water heater off when it is not in use, except when you
are on an extended holiday. The thermostat is fully automatic and power is only
used when heating is required.
TEMPERATURE ADJUSTMENT
An Optima water heater features a user adjustable
thermostat, which allows you to choose the most
suitable temperature for your hot water needs. To
adjust the temperature, push in the child resistant
knob and turn anticlockwise to decrease or
clockwise to increase the temperature setting. The
Optima has a minimum temperature setting of 60°C
and a maximum temperature setting of 75°C.
5