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！
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。
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。
Each electrical heater band can be arranged in a sealing bush 1 which is combined with the oil tube in case of the contact with oil.
每段电热带可置在与油管结合的密封套筒1里，以防与油液接触。
Each electrical heater band can be arranged in a sealing bush 1 which is combined with the oil tube in case of the contact with oil.
每段电热带可置在与油管结合的密封套筒1里，以防与油液接触。
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