以下为句子列表：
英文: Fans consume more power than the pumps of a liquid system, but if the unit is installed in a facility that uses air distribution, only a slight power cost is chargeable against the solar space-heating system.
中文: 风扇比起液体系统的泵，需要更多能量，但是如果工厂中建立的使用空气分配的单元，相对太阳能空间加热系统，仅仅需要很少的能量付出。
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英文: Most air space-heating systems also preheat domestic hot water through an air-to-liquid heat exchanger.
中文: 大部分空气空间—加热系统也会通过气水热交换器预加热家庭里的热水。
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