Water Quality

Water supply quality


In high chloride water supply areas, the water can corrode some parts and cause them to fail. Where the chloride level exceeds 200 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 6.5 or more than 8.5.

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 6.5 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.

Change of water supply

Changing, or alternating, from one water supply to another can have a detrimental effect on the operation and/or life expectancy 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 requirements of our Sanden Eco® Plus Hot Water Heat Pump System warranties.

Check water quality in your area

To check your Australian postcode for its published variable water quality, please enter your postcode below.