现在城市中家庭用太阳能热水器，雷击的危害性相当大，轻则击毁热水器，重则毁坏建筑、导致人身事故。虽然遭受雷击的概本很小，但若发生，将造成无法挽回的损失。一般住宅楼楼顶都装有避雷带、网、针等完善的防直击雷装置，它们分别使建筑物四周、顶面和顶面内高出部分（例如 Now in urban areas with solar water heaters, lightning damage is quite large, ranging from the destruction of water heaters, heavy construction is destroyed, leading to personal accidents. Although the sum of lightning strikes is small, if it happens, it will cause irreparable damage. The roofs of ordinary residential buildings are equipped with lightning protection devices such as lightning protection tapes, nets and needles, which are respectively used to raise the height of the buildings, the top and the top of the buildings (for example,