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INSTALLATION
25
Off-Peak or Time Controlled Electricity Supply
A single or twin element electric water heater connected to an Off-Peak electricity
supply should not be installed as part of a circulated hot water flow and return
system in a building. The benefits of the Off-Peak electricity supply will be
significantly reduced.
If a circulated flow and return system is required, it is necessary to install a
secondary water heater in the circulated flow and return system and supplied
from the Off-Peak electric water heater. The flow and return lines connect to the
secondary water heater, not the Off-Peak electric water heater. 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.
Note: The thermostat or preset outlet temperature of the secondary water heater
must always be set to at least 60°C.
Refer to the Circulated Hot Water Flow and Return – Off-Peak Electric Water
Heater diagram on page 25.
LEGEND
Circulated Hot Water Flow and Return System
Off-Peak Electric 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 insulation
must be weatherproof and UV resistant if exposed.
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