INSTALLATION – SOLAR STORAGE TANK
17
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the in-series
booster water heater and the hot water outlets in any ablution area such as a bathroom or ensuite, to
reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the installation
of this water heater meets the delivery water temperature requirements of AS/NZS 3500.4 so that
scalding water temperatures are not delivered to a bathroom, ensuite or other ablution area.
The temperature limiting device used with a solar water heater should have a specified minimum
temperature differential, i.e. between the hot water inlet and the tempered water outlet, of no greater
than 10°C.
Where a temperature limiting device is installed adjacent to the in-series booster water heater, the cold
water line to the temperature limiting device can be branched off the cold water line either before or
after the isolation valve, pressure limiting valve and non return valve to the solar storage tank. If an
expansion control valve is required, it must always be installed after the non return valve and be the last
valve prior to the solar storage tank.
If a pressure limiting valve is installed on the cold water line to the solar storage tank and the cold water
line to a temperature limiting device branches off before this valve or from another cold water line in the
premises, then a pressure limiting valve of an equal pressure setting may be required prior to the
temperature limiting device.
Two Temperature Zones Using Temperature Limiting Device
