Rheem 800 Series Owner's Manual page 28

INSTALLATION
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 water heater and the hot water outlets in any ablution and public
areas such as a bathroom, ensuite or public amenities, 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 or public area.
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, pressure limiting valve and
non-return valve to the water heater. 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 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
LEGEND
28