Specifications

12
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Rheem
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 Rheem 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 the Rheem warranty does not apply to a copper heat
exchanger or a copper cylinder in a Water Star continuous flow 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 prior to the water heater to protect and for the Rheem warranty to apply to the
temperature pressure relief valve and copper cylinder.
Where the saturation index exceeds +0.80, the Rheem warranty does not apply to a copper heat exchanger,
a copper cylinder or a heating unit in a Water Star continuous flow water heater.
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 below.
-1.0
no warranty applies to a:
temperature pressure relief valve or a
water heater cylinder unless an
expansion control valve is fitted.
no warranty applies to a:
-copper cylinder
SATURATION INDEX (SI)
WATER STAR WATER HEATER
WITHIN WARRANTY
SPECIFICATION
SATURATION INDEX
(calculated @ 80°C water temperature)
no warranty applies to a:
-standard watts density heating unit -copper cylinder
+0.4 +0.80
very corrosive very scaling
scaling
corrosive
no warranty applies to a: - Water Star continuous flow copper
heat exchanger or copper cylinder
-.heating unit
no warranty applies to a: - Water Star continuous flow copper
heat exchanger or copper cylinder
-.copper sheathed heating unit