Rheem 180 Owner's Manual And Installation Instructions page 30

INSTALLATION
Two Temperature Zones Using a Temperature Limiting Device – Indirect Solar Water Heater
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
A solar water heater should not be installed as part of a circulated hot water flow and return system in a
building. The benefits of solar gain will be significantly reduced.
In-tank electric boosting
If this solar water heater has its electric heating unit connected for in-tank boosting and a circulated flow and
return system is required, it is necessary to install a secondary water heater supplied from the solar water
heater. The flow and return lines connect to the secondary water heater, not the solar storage tank. The
secondary water heater makes up for the pipe heat loss in the flow and return system and must be able to
provide a hot water outlet temperature of at least 60°C.
Circulated Hot Water Flow and Return System – Solar Water Heater with In-tank Boosting
Refer to the diagram
on page 30.
Circulated Hot Water Flow and Return System – Solar Water Heater with In-tank Boosting
In-series boosting
If this solar water heater does not have its electric heating unit connected for in-tank boosting and is installed
as a solar pre-heater to an in-series booster water heater, then the booster water heater can be used as the
secondary water heater so long as it is able to provide a minimum hot water outlet temperature of at least 60°C
and it is not connected to an Off-Peak or time controlled electricity supply. It is necessary to connect the flow
and return lines to the in-series booster and not to the solar storage tank.
Circulated Hot Water Flow and Return System – Solar Water Heater with In-series
Refer to the diagram
Boosting on page 31.
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