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

它比热效率和燃料效率更高。

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

这看起来很简单，只是您不知道什么是热效率等级。

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

大多数燃公路汽车热效率在 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——热效率等级至少为 75% 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.

，地供暖主要由分散式小锅提供，主要使用煤炭，热效率低，浪费能源，冬季供暖时，给地环境保护带来压力。