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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 Solahart
®
continuous flow water heater model you have chosen is for outdoor installation only and is
only suitable for use with a solar water heater with an over temperature protection system, unless a solar
transfer or solar bypass valve is installed. This water heater has been 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.
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
16, 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 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
its preset outlet temperature setting 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.
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.
GAS BOOSTING FOR A SOLAR WATER HEATER
Water stored in the solar storage tank passes through the in-series gas booster when a hot tap is opened.
The in-series gas booster is for heating water at times of low solar energy gain, such as during cloudy or
rainy weather, or during colder months.
Solar heated water can reach temperatures up to 70°C to 80°C for a Streamline pumped system or up to
85°C for a Thermosiphon system with an over temperature protection system and possibly higher for a
Thermosiphon system without an over temperature protection system. The in-series gas booster operates
automatically. When the solar heated water temperature is 58°C or higher, the flow passes through the in-
series gas booster without boosting. When the solar heated water temperature is below 58°C, the in-series
gas booster heats the water to its preset outlet temperature setting.
