电热管用U型钢管，烧结氧化镁和电热丝制成，直接浸在水里热能损耗少。
The electrical heating tube is made of U shaped steel tube, sintered magnesia and heating wire. It is immersed directly in the water for preventing heat loss.
电热管用U型钢管，烧结氧化镁和电热丝制成，直接浸在水里热能损耗少。
The electrical heating tube is made of U shaped steel tube, sintered magnesia and heating wire. It is immersed directly in the water for preventing heat loss.
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