Can closing the valve on the solar water heater prevent freezing in winter?

First, drain all the water under the valve to prevent freezing, but this is not the fundamental solution. If you really want to solve the problem of freezing in winter, you have to take the following two points:

1, anti-fall thermal insulation module. Without it, the connection between water pipe and water tank must be frozen in winter without hot water. Traditional insulation is as simple as sticking the insulation pipe to the water tank with adhesive tape. Because the water pipe will shake when it is full of water, it will shake back and forth when it is windy for a long time, resulting in the tape falling off, the insulation pipe falling off (live demonstration) and the water pipe exposed. In winter, if you don't use it for a day, you may be fine. If it is not used for two or three days, the pipeline will definitely freeze. If it is light, you don't need hot water. The pipeline is severely cracked, leaking water, and the valve is cracked. There have been vicious incidents in which the valve melted in the spring and killed people.

The patented insulation module connects the insulation pipe and the water tank into a whole, which ensures the unimpeded entry of hot water, makes the installation of the pipe more beautiful, embodies the differentiation of products and enhances the brand image.

2, antifreeze zone, one can freeze, one can freeze.

The integrated antifreezing belt is terminated and wired with white sheath line in the workshop, and it can only leave the factory after passing a series of factory tests, which can effectively solve the fire phenomenon caused by poor handling of the joint of antifreezing belt and ensure the safety of antifreezing belt. However, special attention should be paid to installation. Connections like this must be sealed with special sealant at the joints so that water can't penetrate when it rains and drips. But if you wrap it with tape like this (live demonstration), it will leave hidden dangers. Because of its uneven edges and corners and the tension of the copper wire inside, it can't be completely sealed, and water can easily seep in and rust slowly, which will lead to short circuit and even fire.