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INSTALLATION – WATER HEATER
HOT WATER DELIVERY
An 872 series water heater can deliver hot water at a temperature up to 82°C depending upon its preset outlet
temperature setting. This temperature is sufficiently hot to cause severe scalding. Water at this temperature
may be plumbed to fixtures where water hotter than 50°C is allowed, such as a kitchen, laundry and other
areas requiring sanitising temperatures.
The installing plumber may have a legal obligation to ensure the installation of this water heater meets the
water temperature delivery requirements of the Plumbing Code of Australia and New Zealand Building Code
Clause G12 so that heated water delivered to fixtures and appliances used primarily for personal hygiene is at
a temperature which is unlikely to scald.
It is necessary and we recommend that a temperature limiting device be fitted between an 872 series water
heater and the fixtures and appliances used primarily for personal hygiene such as in a bathroom, ensuite,
public amenities or other ablution areas, to reduce the risk of scalding. The temperature limiting device must
be of a type suitable for use with a continuous flow gas water heater. Refer to the manufacturer's specifications
of the temperature limiting device.
Where a temperature limiting device is installed adjacent to the 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
and pressure limiting valve to the water heater.
If a pressure limiting valve is installed on the cold water line to the water heater 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 a Temperature Limiting Device
Gas Booster for a Solar Water Heater
The temperature limiting device used with an 872 series in-series gas booster as part of a solar water heater
installation must be of a type suitable for use with both a continuous flow water heater and a solar water heater.
Refer to the manufacturer's specifications of the temperature limiting device.
Warning: Temperature controllers must not be fitted to this water heater (872 series) if it is installed as
an in-series gas booster with a solar water heater system because water at a temperature much higher than
the controller setting can be delivered. If a solar water heater is installed to an existing water heater installation,
then all controllers must be disconnected and removed.
Where a temperature limiting device is installed adjacent to the in-series gas booster, the cold water line to the
temperature limiting device can be branched off the cold water line either before or after the isolation valve
and pressure limiting valve to the solar storage tank, but it MUST BE before the non-return valve prior to an
open circuit system. The cold water line to the temperature limiting device can be branched off the cold water
line either before or after the non-return valve prior to a closed circuit system. 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.
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