In the case of constant pipe diameter, lengthening the length of vacuum tube is an effective way to increase the total heat of solar water heater!

在管径恒定的情况下，加长真空管的长度是增加太阳能热水器总得热量的有效途径和方向！

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These probes include a small electrical heater which is supplied from a small battery in the pressure case.

这些探头各有一个在加压情况下由小蓄电池供电的小型电热器。

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The RMI house's supplemental solar-powered water heater provides back-up in case the water heated by the panels on the roof isn't hot enough.

此外，马绍尔房子的补充太阳能热水器提供的备份，以防水中的屋顶板加热不够热。

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I'll leave the keys, case you want to run the heater some.

NPR: Excerpt: 'The Assassins Gallery'