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WATER SUPPLIES
WATER HEATERS NOT INSTALLED IN ACCORDANCE WITH THIS ADVICE
WILL NOT BE COVERED BY THE WARRANTY.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies. However,
there are some known water supplies which can have detrimental effects on the water heater and its operation
and/or life expectancy. If you are unsure of your water quality, you may be able to obtain information from your
local water supply authority. This water heater should only be connected to a water supply which complies with
these guidelines for the water heater warranty to apply.
SATURATION INDEX
The saturation index is used as a measure of the water’s corrosive or scaling properties. In a corrosive water
supply, the water can attack copper parts and cause them to fail. Where the saturation index is less than –1.0, the
water is very corrosive. An expansion control valve* may need to be fitted on the cold water line after the non-
return valve in a corrosive water area where there are sufficient quantities of silica dissolved in the water.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface. Where the
saturation index exceeds +0.40, the water is very scaling. An expansion control valve* must be fitted on the cold
water line after the non-return valve to protect and for warranty to apply to the temperature pressure relief valve
and water heater cylinder.
* Refer to the cold water connection detail on page 19.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and / or life expectation of the water heater, the storage cylinder and the relief valves.
Where there is a changeover from one water supply to another, eg, a rainwater tank supply, desalinated water
supply, public reticulated water supply or water brought in from another supply, then water quality information
should be sought from the supplier or it should be tested to ensure the water supply meets the requirements given
in these guidelines for warranty to apply.