管道和热水器
热泵热水吗heaters work and why you should get one
...heatsource in a home is an air sourceheatpump, as the waterheater can in effect 'borrow' the efficiency of thatheatpump, which on average is about 3 times more efficient than most otherheatsources. See here for an article onhowheatpumpswork. An air-to-waterheatpump waterheater uses the air in the hous...