When is the solar water heater not suitable for water injection?

It is difficult to supply water when the sunshine intensity is high during the day, which is easy to cause the vacuum tube to burst. Not safe. Nowadays, water heaters automatically add water, so you don't have to worry about when to add water and whether the water is full. Don't buy the kind of solar water heater that needs manual water supply. As far as I know, the Smiths produce solar automatic water supply, and they have the patent of vacuum tube anti-burst. You can have a look.