| 摘要 |
An apparatus 1 for heating water in a water tank 10 comprises a heat exchanger coil 3 mounted in the attic â Xâ of a building. The coil has a water inlet 3A and outlet 3B and heats water contained therein by thermal transfer with hot air in the attic. The heated water is subsequently delivered to the tank. The coil may be located in an apex â Yâ of the roof space. The heated water may be re-circulated through the coil by a pump 5 submerged in the tank. A fan 4 may force air over the coil to increase heat transfer. The fan and pump may be powered by electricity generated by a solar panel 9. A thermostatic control switch 8 may be provided that only permits activation of the fan and pump when the temperature of attic air is a predetermined amount above the temperature tank water. The apparatus may include an agitator 6 to mitigate sediment collecting at the bottom of the tank and ensure even water temperature in the tank by preventing stratification. The heated water may taken by a further outlet 13 for domestic hot water applications. A mains cold water supply 11 may be provided.
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