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HOW YOUR WATER HEATER WORKS
11
MAINS PRESSURE
The water heater is designed to operate at mains pressure by connecting directly to the mains water
supply. If the mains supply pressure in your area exceeds that shown on page 19, a pressure limiting
valve must be fitted. The supply pressure should be greater than 350 kPa for true mains pressure
operation to be achieved. The supply pressure should be greater than 140 kPa for the rated flow and
performance of the gas booster to be achieved.
GOING ON HOLIDAYS
It is not necessary to switch off the electrical supply at the power outlet to the water heater if you are
going away. However, if it is necessary to switch off the power to the water heater, refer to “To Turn Off
The Water Heater” on page 6. If the power to the water heater is switched off and there is a risk of
freezing, then it is necessary to drain the gas booster (refer to “Draining the Gas Booster Water Heater”
on page 9)