9
HOW YOUR WATER HEATER WORKS
GAS BOOSTING FOR A SOLAR WATER HEATER
Water stored in the solar storage tank passes through the gas booster water heater when a hot tap is
opened. The gas booster water heater is for heating water at times of low solar energy gain, such as
during cloudy or rainy weather, or during winter months.
This water heater is not suitable for use with a solar water heater without an over temperature
protection system. Solar heated water can reach temperatures up to 75
°
C for a Streamline pumped
system or up to 85
°
C for a Thermosiphon system with an over temperature protection system. The gas
booster water heater operates automatically. When the solar heated water temperature is above 58
°
C,
the flow passes through the gas booster water heater without boosting. When the solar heated water
temperature is below 58
°
C, the gas booster water heater heats the water to a minimum temperature of
60
°
C.
WATER HEATER OPERATION
The water heater operates automatically if heating of the water is required. When a hot tap is opened
and the solar heated water temperature is below 58
°
C, the gas burners ignite to provide immediate
heating of the water to a minimum temperature of 60
°
C as the water passes through the water heater.
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. 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.
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
15, 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.
GENERAL MAINTENANCE
The jacket of the water heater can be cleaned with a soft cloth
and warm mild soapy water. Under no circumstances should
abrasive materials or powders be used.
SERVICING
For safe and efficient operation, the water heater should be
serviced annually by your nearest Solahart Dealer. Only genuine
replacement parts should be used on this water heater.
Warning:
Servicing of a gas water heater should only be
carried out by authorised personnel.
