热泵热水器（HPWH）是一种节能型热水系统，适用于新建和改造的住宅和商业应用。HPWH有两种通用类型:（1）与常规水箱垂直的独立设备式热泵机组；（2）安装在水箱顶部的热泵的整体式热泵/水箱机组。这两种类型均独立于空间调节设备安装。在每种情况下，热泵都会吸入空气，从中提取热量，并利用这些热量击打水箱中的水。该系统的一个副产品是冷却、除湿的空气排放。根据一年中的季节、地理区域和HPWH的建筑位置，通过对空间的冷却作用，系统的整体效率会增加或降低- 调节负荷。由于HPWH不会在70摄氏度（45华氏度）以下运行，也没有防冻保护，因此首选的安装位置是无条件的建筑空间，如地下室、爬行空间或公用设施室。HPWIL在过去一年中已投入商用，安装成本低于1000美元。至少有七家制造商计划在未来6至12个月内推出HPWH。引文:德克萨斯州休斯顿ASHRAE学报第88卷第1部分研讨会

A heat pump water heater (HPWH) is a conservation water heating system for new and retrofit residential and commercial applications. There are two generic types of HPWHs: (1) a stand-alone appliance-type heat pump unit plumbed to a conventional water tank, and (2) an integral heat pump/water tank unit with the heat pump installed on top of the tank. Both types are installed independently of the space conditioning equipment. In each case, the heat pump draws in air, extracts heat from it, and uses this to beat the tank water. A byproduct of the system is cool, dehumidified air discharge.Depending on the season of the year, the geographical area, and the building location of the HPWH, the overall system efficiency is increased or decreased by cooling effects on the space-conditioning load. Since HPWHs do not operate below 70C (45 F) and have no freeze protection, the preferred installation location is an unconditioned building space, such as a basement, crawl space, or utility room. HPWIls have become commercially available in the past year and cost under $1,000 installed. At least seven manufacturers plan to market HPWHs within the next 6 to 12 months.