Intensive combustion should be used in water heater. Heat convective surface is better than heat radiant surface for heat transfer in water heater.

在热水器上应采用强化燃烧方式，尽量采用对流受热面，减少辐射受热面。

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The earth would be a frozen ball if it were not for the radiant heat of the sun.

要是没有太阳的辐射热，地球将会是一个冰冻的球体。

《柯林斯英汉双解大词典》

Such feedbacks might involve ice on land and sea, clouds, or water vapor, which also absorb radiant heat.

这种反馈可能涉及陆地和海洋上的冰、云或水蒸气，这些也会吸收辐射热。

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The water is further heated by five solar-powered electrical pumps, to create radiant heat coming up through the wooden floorboards.

FORBES: Magazine Article

TC4, however, they trap radiant heat from below, warming things up.

ECONOMIST: Climatology

Suddenly, the entire room exploded in flames, as the radiant heat ignited every piece of furniture, every curtain, every possible fuel source, even the carpeting.

NEWYORKER: Trial by Fire