It is safe to discharge auxiliary heat in solar water heaters.
Water has resistance. When the pipe diameter of 15mm is greater than 15cm, as long as the hot water pipe does not use metal pipes, even if there is a leak, no one will be shocked.
Solar water heaters use PPR or PVC pipes, so there is no need to worry about leakage and electric shock.
However, the water heater body may become charged due to a leak.
So when you take a bath, you don't have to worry about water loading, but to avoid leakage of the body and support, it is better to install a protector leakage on the auxiliary line.
Yes.
Solar water heaters with auxiliary electric heaters, when weather permits, heat water in the same way as regular solar water heaters. They mainly rely on the collection of solar energy pto heat.
When hot water is needed on rainy days and bad weather, you can choose to use an electric backup heater to heat the water in the water tank.