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10
Change Of Water Supply
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and/or life expectation of the water heater storage cylinder, pressure temperature relief valve and heating
unit.
Where there is a changeover from one water supply to another, e.g. a rainwater tank supply, bore water
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 it should be tested to ensure the
water supply meets the requirements given in these guidelines for the Joule warranty to apply.
Water Chemistry
This water heater must be installed in accordance with this advice to be covered by the Joule warranty. This
water heater is manufactured to suit the water conditions of most public reticulated water supplies. How-
ever, 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. We recommend not to use water softener, however if it is
used the water is required to be kept at potable standards. This water heater should only be connected to a
water supply which complies with these guidelines for the JOULE warranty to apply.
Water Chemistry Levels Affecting Warranty
The JOULE warranty of this water heater will not cover resultant faults on components including the storage
cylinder where water stored in the storage cylinder exceeds at any time any of the following levels:
Components
Maximum Permitted Levels
Total Dissolved Solids
600 mg/litre
Total Hardness
200 mg/litre
Chloride
300 mg/litre
Magnesium
10 mg/litre
Calcium
20 mg/litre
Sodium
150 mg/litre
Iron
1 mg/litre
Maximum pH
9.5
Minimum pH
6.5
Introduction
