Rheem Pronto 012 Owner's Manual And Installation Instructions page 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 an 834 series 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.
The temperature limiting device must be of a type suitable for use with an instantaneous gas water heater and
should have:
 a specified 'minimum temperature differential' between the hot water inlet and the tempered water outlet
of no greater than 10°C, and
 a specified 'maximum permitted pressure variation' in the supply between the hot water inlet and the cold
water inlet of no less than 15%.
Refer to the 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
LEGEND
INSTALLATION – WATER HEATER
17