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 27 Water Star
®
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 35).
The water heater has a maximum preset outlet temperature setting of:
874 series -
75°C
Water Star water saving function
70°C
A quantity of water is maintained within the Water Star cylinder at a fixed temperature, and water initially
discharged by this water heater at start-up may be at a temperature of up to 70°C before the water
heater normalises to its preset outlet temperature.
Note:
This water heater is not suitable for installation or operation as an in-series gas booster to a solar
water heater, and
must not
be used for this purpose.
WATER HEATER OPERATION
A quantity of water is kept hot in an electrically heated, thermostat
controlled copper cylinder. When a hot tap is turned on, hot water is
supplied immediately from this cylinder.
Water flows through the heat exchanger of the water heater when a
hot tap is opened and the gas burners ignite to provide immediate
heating of the water. Heat produced by the burner is transferred to the
water through the heat exchanger. The water flow is initially diverted
into the copper cylinder until it reaches the preset outlet temperature
setting of the water heater. The water flow is then diverted away from
the cylinder directly to the outlet of the water heater.
The water flowing through the heat exchanger is heated to a constant
temperature by automatic adjustment of the gas supply to the burner to
suit the water flow rate. The gas burners extinguish when the hot tap is
closed. Water in the cylinder is kept hot until the next time a hot tap is
turned on.
Automatic safety controls are fitted to the water heater to provide safe
and efficient operation.
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
19, a pressure limiting valve must be fitted. The supply pressure
should be greater than 160 kPa for the rated flow and performance to be achieved.
