IT IS MORE HEAT- AND FUEL-EFFICIENT THAN AN OPEN HEARTH.

它比平炉的热效率和燃料效率更高。

That seems simple, except you won't know what thermal efficiency rating is.

这很简单，只是您不知道什么是热效率。

Most combustion road cars have a thermal efficiency between 20 - 30%.

大多数燃公路汽车的热效率在 20 - 30% 之间。

On the IRS website, you'll find this-- heat pumps with a thermal efficiency rating of at least 75% qualify.

在 IRS 网站上，您会发现这一点——热效率少为 75% 的热泵符合条件。

In the past, local heating was mainly provided by decentralized small boilers mostly using coal, which has low thermal efficiency and wastes energy, putting pressure on local environmental protection during winter heating season.

过去，当地供暖主要由分散式小锅炉提供，主要使用煤炭，热效率低，浪费能源，冬季供暖时，给当地环境保护带压力。