Several countries have used subsidies to jump-start the market, including Japan, where almost 1 million heat pumps have been installed in the past two years to heat water for showers and hot tubs.

一些国家利用补贴来启动这个市场，包括日本，在过去两年中日本安装了近100万台热泵，为淋浴和热水浴缸提供热水。