Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre - Manual (Page 19)

INSTALLATION
19
Two Temperature Zones Using a Temperature Limiting Device
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
If a Rheem water heater is to be installed as part of a circulated hot water flow
and return system, a storage water heater able to provide a hot water outlet
temperature of at least 60
°C must be used. Note: The thermostat must always
be set to at least 60 °C. Refer to the diagram on page 20.
Refer also to
“Recirculation System” on page 43.
Temperature Limiting Device
A temperature limiting device cannot be installed in circulated hot water flow
and return pipe work unless it is specifically designed to do so, such as the
Rheem Guardian warm water system.
The tempered water from a temperature limiting device cannot be circulated.
Where a circulated hot water flow and return system is required in a building, a
temperature limiting device can only be installed on a dead leg, branching off
the circulated hot water flow and return pipe.
If circulated tempered water were to be returned back to the water heater,
depending on the location of the return line connection on the water supply line
to the water heater, then either:
• water will be supplied to the cold water inlet of the temperature limiting
device at a temperature exceeding the maximum recommended water
supply temperature, or
• when the hot taps are closed no water will be supplied to the cold water
inlet of the temperature limiting device whilst hot water will continue to be
supplied to the hot water inlet of the temperature limiting device.