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An infrared heater or heat lamp is a heating appliance containing a high-temperature emitter that transfers energy to a cooler object through electromagnetic radiation. Depending on the temperature of the emitter, the wavelength of the peak of the infrared radiation ranges from 750 nm to 1 mm.
The amount of heat delivered by a solar water heating system depends primarily on the amount of heat delivered by the sun at a particular place . In the tropics insolation can be relatively high, e.g. 7 kWh/m 2 per day, versus e.g., 3.2 kWh/m 2 per day in temperate areas.
Such water heaters are often fitted with an auxiliary electrical immersion heater for use if the boiler is out of action for a time. Heat from the space-heating boiler is transferred to the water heater vessel/container by means of a heat exchanger, and the boiler operates at a higher temperature than the potable hot water supply.
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