Rheem 953060DP Owner's Manual And Installation Instructions page 23

CHLORIDE AND PH
In a high chloride water supply, the water can corrode stainless steel parts and
cause them to fail. Where the chloride level exceeds 250 mg/L the Rheem
warranty does not apply to the water heater if fitted with a brazed plate stainless
steel heat exchanger.
Where the pH is less than 6.0 the Rheem warranty does not apply to the pump
of the Tankpak water heater. pH is a measure of whether the water is alkaline or
acid. In an acidic water supply, the water can attack stainless steel parts and
cause them to fail.
Water with a pH less than 6.0 may be treated to raise the pH. The water supply
from a rainwater tank in a metropolitan area is likely to be corrosive due to the
dissolution of atmospheric contaminants.
Where the Chloride and/or pH exceed the warranty limits for stainless steel, an
optional copper tube in tube heat exchanger can be specified, subject to the
Saturation Index being within warranty limits.
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING THE RHEEM
WARRANTY
The water heater storage tank and its components (the system) are not suitable
for certain water chemistries. Those chemistries are listed below. If the system
is connected at any time to a water supply with the following water chemistry, the
Rheem warranty will not cover any resultant faults on the components listed
below:
Water Chemistry
Saturation Index (SI) < -1.0
Saturation Index (SI) > +0.4
Chloride > 250 mg/L
pH < 6.0
WATER SUPPLIES
Component
water heater (copper heat exchanger and parts)
water heater (expansion control valve)
water heater (stainless steel heat exchanger)
water heater (stainless steel heat exchanger)
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