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This type of solar water heater provides main pressure pre-heating
via a highly effective copper coil heat exchanger located within the
solar collector tank. Rather than using the water in the tank directly,
as the non pressure does, this type uses a 20 to 30m copper coil.
Heat exchanger inside the tank provides more than 1.5m² of heat
transfer area.
When water flows though the coil, it absorbs heat from the water
inside the solar collector tank. The solar collector tank is therefore
a thermal store.
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