Water Supplies - Rheem Water Star Owner's Manual And Installation Instructions

WATER SUPPLIES

This water heater must be installed in accordance with this advice to 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 chemistries
which can have detrimental effects on the water heater and its operation
and / or life expectancy. If you are unsure of your water chemistry, 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.
Due to the nature of the water chemistry the copper cylinder is not covered by
the water heater warranty when this water heater is connected to the public
water supply in the Redlands Shire in Queensland.
SATURATION INDEX
The saturation index (SI) 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 and
warranty does not apply to a copper cylinder in a Water Star water heater.
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.
Where the saturation index exceeds +0.80, warranty does not apply a copper
cylinder in a Water Star water heater or its heating unit.
Water which is scaling may be treated with a water softening device to reduce
the saturation index of the water.
Refer to the Saturation Index chart on page 11.
Refer to the cold water connection detail on page 22 for the position of the
expansion control valve.
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