Of course, the principle is that there must be water in the water tank.
It is recommended to install a water temperature and level indicator so that the water level and water temperature can be checked at any time. In summer the water temperature is around 42 degrees and in winter the water temperature should be higher, so that the water temperature requirements for swimming can be met. There is no need to fill the water tank in winter, so the heating time will be much faster.
Whether you can use solar water heaters for indoor heating depends on your region. The effect may be better in the region. to the south, but it must be properly designed. The heat input should be sufficient (the ratio of the sunlight receiving surface to the indoor area), the auxiliary electric circulation design should be reasonable (the electric heatingElectricity is needed at night, use a pipeline. circulation pump), and the insulation and heating performance must be good to meet the needs.