水热交换器 meaning in English

water heat exchanger

Most air space - heating systems also preheat domestic hot water through an air - to - liquid heat exchanger
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。
Heat exchangers - water to water heat exchangers for district heating - test procedures for establishing the performance data ; german version en 1148 : 1998
热交换器.直接加热式水水热交换器.确定功率数据的测