一种太阳能热水器系统装置，它由真空太阳能吸收器、电辅助加热装置、节水防冻装置构成。

A solar water heater system is composed of vacuum solar energy absorber, electrically aided heater and water-saving antifreezing unit.

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通过实验分析，提出了塞拉门防冻电热装置的技术条件和检验要求。

Via experiment and analysis, the technical specifications of the freeze proof and electrical heating device for plug doors as well as the inspection requirements are put forward.

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介绍了塞拉门防冻电热装置的原理、结构、形式。

The principles, structure and mode of the freeze proof and electrical heating device for plug doors are described.

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