Air source heat pump water heaters (HPWH) use electricity-driven vapor compression refrigeration cycle program, the low grade heat source (air) heat transfer to the water is heated to produce hot water. Air source heat pump heating energy efficiency ratio is much higher than traditional power equipment, its principle is similar to a refrigerator refrigeration. This paper analyzes the application of air-source HPWH in the bathroom, and energy-saving effect of air source HPWH was introduced.%空气源热泵热水机组利用电能驱动蒸汽压缩制冷循环，将低品位热源（空气）中的热量转移到被加热的水中以制取热水。空气源热泵制热能效比远高于传统电力设备，其原理与冰箱制冷类似。对热泵热水器在民用领域的应用进行了分析，介绍了空气源热泵热水器的节能效果。
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