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WATER SUPPLIES 
34 
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 
corrosive and a corrosion resistant heating unit should be used. 
 
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 scaling and an expansion control valve* must be fitted on the cold water line 
after the non-return valve. Where the saturation index exceeds +0.80, a low 
watts density heating unit should be used. 
 
Contact your nearest Rheem Service Department or Accredited Service Agent 
if a replacement heating unit is required. 
 
 
* Refer to the 
 
WATER HEATERS NOT INSTALLED IN ACCORDANCE WITH THE ABOVE 
ADVICE WILL NOT BE COVERED BY THE WARRANTY.