我国寒冷地区土暖气遍及千家万户,但它的必要配套设施——膨胀水箱的大小、加水量及加水时间,长期以来人们一直难以掌握。膨胀水箱过小,容水量少,满足不了采暖系统水膨胀的需要。膨胀水箱过大,体积大,占有效空间大,影响美观,增加造价,而且采用铁板焊制的水箱,时间长了 In China’s cold regions, soil heating is spread across thousands of households, but its necessary supporting facilities, such as the size of the expansion tank, the amount of water added, and the time for adding water, have long been difficult to grasp. The expansion tank is too small to contain enough water to meet the water expansion requirements of the heating system. The expansion tank is too large and bulky, which occupies a large space, affects the appearance, increases the cost, and uses a welded steel tank, which takes a long time.