Heat pumps usually deliver heat in the form of hot water, as do most conventional central-heating systems. However, to maintain a high energy-efficiency, the emitter system should be designed so that the water temperature is as low as possible. Ideally, a well-designed underfloor heating system should be used. Radiators may be the only alternative, but should be significantly larger in area than normal. Several radiators in one room is advantageous.
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