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4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
The Rheem
®
continuous flow gas water heater model you have chosen is for
outdoor installation only. This model has an extended manufacturer’s warranty
(refer to the Rheem warranty on page 79).
The water heater has a maximum preset outlet temperature setting of:
871 series 70°C – AU 60°C – NZ
875 series 48°C
Notes:
The 875 series water heater is marked “THIS APPLIANCE DELIVERS
WATER NOT EXCEEDING 50°C IN ACCORDANCE WITH AS 3498” on
the front panel. This model;
must not be installed as an in-series gas booster to a solar water heater, as water temperature
greater than 50°C can be delivered from the water heater contravening its compliance to Australian
Standard AS 3498.
AU – The 871 series of water heater may be installed as an in-series gas booster to a solar water
heater. For information relating to the function and operation of the solar water heater, refer to the
Owner’s Guide and Installation Instructions supplied with the solar water heater.
NZ – The 871 series water heater is not suitable for use as an in-series gas booster to a solar water
heater.
When installed as a gas booster to a solar preheater, the 871 series water heater:
can deliver water at temperatures up to 70°C to 80°C for a Premier Loline and Loline pumped
system and a Hiline thermosiphon system and possibly higher temperatures from a Premier Hiline
thermosiphon system.
during periods of low solar energy gain, will boost the water temperature automatically to its preset
outlet temperature setting.
MAINS PRESSURE
The water heater is designed for direct connection to the mains water supply. If the mains supply pressure in
your area exceeds that shown on page 48, a pressure limiting valve must be fitted. The supply pressure
should be greater than 140 kPa for the rated flow and performance to be achieved.
WATER HEATER OPERATION
The water heater operates automatically, heating water as it passes through the water heater. When a hot
tap is opened, the gas burners ignite to provide immediate heating of the water. The heat produced by the
burner is transferred to the water through the heat exchanger. The water is heated to a constant temperature
by the automatic adjustment of the gas supply to the burner to suit the water flow rate (refer to “Temperature
Control” on pages 11 to 40). The gas burners extinguish when the hot tap is closed. Automatic safety
controls are fitted to the water heater to provide safe and efficient operation.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the water heater has not operated for some time (which is most often first thing
in the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat
exchanger warms up. This is both an energy and water saving feature of this water heater. Once the
heat exchanger has warmed up the hot water flow will increase and remain at normal flow levels. This
feature will only occur at a cold start-up and not when the heat exchanger is already warm from a recent use
of hot water.
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