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Water Supply Quality
Chloride and pH
In high chloride water supply areas, the water can corrode some parts and cause them
to fail. Where the chloride level exceeds 250 mg/litre warranty does not apply to the
heat pump unit and tank unit. pH is a measure of whether the water is alkaline or acid.
In an acidic water supply, the water can attack the parts and cause them to fail. No
warranty applies to the heat pump unit and tank unit where the pH is less than 6.0. The
water supply from a rainwater tank unit in a metropolitan area is likely to be corrosive
due to the dissolution of atmospheric contaminants. Water with a pH less than 6.0 may
be treated to raise the pH. It is recommended that an analysis of the water from a
rainwater tank be conducted before connecting this type of water supply to the system.
Figure 14
Change of water supply
Changing, or alternating, from one water supply to another can have a detrimental
effect on the operation and/or life expectation of the water tank unit cylinder, PTR valve,
water heating circulation and the heat exchanger in the system. Where there is a
changeover from one water supply to another, for example, a rainwater tank supply,
desalinated water supply, public reticulated water supply or water brought in from
another supply, then water chemistry information should be sought from the supplier or
the water should be tested to ensure it meets the warranty requirements in this
installation manual.
Sanden Heat Pump – Installation Manual
Page 19 of 26
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