Solar energy, whose time has come, is very suitable to heat water or make electricity.

太阳能的时代已经到来，它非常适合用来加热水或发电。

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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。

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Heat is trapped and used to heat water.

热量被截留下来用于加热水。

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Solar water heaters are devices that use energy from the sun to heat water.

VOA: special.2009.04.20

And the idea was that gravity did work on the water and falling, and that work led to the generation of heat.

焦耳的想法是,重力对水，做了功。

麻省理工公开课 - 热力学与动力学课程节选

And if I do that then I can find out the change in enthalpy of this reaction. It's just going to be the heat of formation of these three moles of water, minus the heat of formation of the iron oxide. OK.

我就能得到这个,反应的焓的变化,它就是三摩尔水,的生成热，减去氧化铁的,生成热，好。

麻省理工公开课 - 热力学与动力学课程节选

Geothermal technology uses energy in the earth's crust to heat water and buildings.

BBC: MLA claims low cost home heating scheme at risk

You are now driving(in effect) on free solar energy that you created by removing the need to heat water and using the natural gas to drive your car instead.

FORBES: Gassing Up: Why America's Future Job Growth Lies In Traditional Energy Industries

As solar panel prices have plunged, developers like Solar Millennium have abandoned solar thermal technology, which uses huge mirror arrays to heat water to create steam that drives an electricity-generating turbine.

FORBES: U.S. Solar Market Jumps 69% in Q2 But Likely To Cool Off