How to prevent the cold water storage tank of solar water heater from freezing?

Ordinary iron drum, with rubber cotton insulation layer, rubber cotton is specially used for outdoor insulation, some with self-adhesive and some with baby.

Buy it and stick it directly around the barrel. Pay attention to the bottom insulation when installing the bucket. You can install a foam pad and wrap it with collodion. The top should also be protected against freezing.

Pay attention to separate installation of upper and lower water pipes. The water supply pipe shall be connected to the top of the bucket, and no stagnation valve shall be installed. Outdoor exposed water pipes should not have traps, so that the whole water pipe will be empty after water is stopped and the water pipe will not freeze. The bottom of the sewer bucket must be parallel to the solar hot water pipe, and a heat tracing belt should be installed. In order to prevent water pipes from freezing and cracking, it is suggested to use frost-resistant PEX pipes for upper and lower water pipes.

If technology permits, an automatic water level detector can be installed in the bucket, which can be filled automatically when water comes. When the water pressure is insufficient, an auxiliary water storage bucket is set indoors, and an automatic water level gauge is also equipped. Tap water is automatically filled when it is available, and then it is automatically filled with a water pump. The whole equipment can be fully automated, so don't worry. Including solar water heaters, can be automatically controlled, and cold water and hot water can be used 24 hours a day.