Caleffi Solar Water Heating Tanks
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The Caleffi solar water heater has either one or two internal coils and a backup electric
heating element in the single coil units. A heating medium is passed through the solar
panels and internal coil as long as there is an adequate temperature difference between
the heating medium and stored water in the tank. The internal coil is located as close
to the bottom to facilitate the transfer of heat even at lower solar panel temperatures.
During periods of water flow through the water heater. hot water is
drawn from the top of the heater and cold water comes into the bottom
of the tank (by a dip tube or bottom inlet). On single coil tanks,
if the hot water demand should exceed the solar heat input or there
is an insufficient temperature difference between the heating medium
and stored water, the heating element thermostat will activate
the electrical heating element for backup heat. On double coil
tanks, the upper tank is connected to the boiler for backup heat.
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