Answer some of your questions first:
Solar water heaters can be heated electrically, but the heating condition is that the water level in the water tank must be greater than half (50%) before the counter. will turn on the heating. It's It burned out because of the electric heating.
If the meter shows low water pressure, it means there is no water! This does not necessarily mean that the tap water pressure is low. If the water drain valve is not open, it is also possible that the water pipe is frozen (if you cannot get water or hot water out, the water pipe The water must be frozen. The heat preservation function must be activated). and hold the heat preservation button to activate heat preservation. Just freeze and thaw the water lines!
It doesn't matter if there is no water in the solar panel inwinter, but make sure there is no water in the pipe. If there is cold water in the pipe and it is not insulated, it doesn't matter. will freeze!
I logged in today!
There are two situations. First, there may be no water in the water tank, but this is just an error showing 50% water level.
The second is that. the water tank actually contains 50% water, the reason why the water cannot be drained is also obvious. He is stuck. Check carefully where the blockage is. Once you find it, solve it.
I hope you will adopt it. Thank you