Rheem 311 Series Owner's Manual And Installation Instructions page 26

INSTALLATION
Circulated Hot Water Flow and Return System – Gas Water Heater
REDUCING HEAT LOSSES
The cold water line to and the hot water line from the water heater must be
insulated in accordance with the requirements of AS/NZS 3500.4. The
LEGEND
insulation must be weatherproof and UV resistant if exposed.
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