It's small. There are many reasons why hot water pipes in solar water heaters burst. After the solar water tank is empty of water, the vacuum tube temperature is high during the day. If water is added at this time, it is easy to explode. due to the big temperature difference. The sun is very strong and it rains suddenly, which will cause the explosion. The exhaust will not be fed, but this also depends on the quality of the hot water lines to the water heater. the explosion power of the solar water heater is also very low. Considering its slight thermal efficiency, the solar water heater does not have the capacity to cause burns due to explosions.
The curing process is not carried out well or the quantitative foaming at high temperature and constant pressure is not carried out well. The insulating layer is made of polyurethane which is very insulating.
Indeedt, the black material and the white material react and form. At that time, it needs to mature in a high temperature and constant pressure environment for about 2 days. The tank will not be deformed until the outer cylinder is broken.
As long as the outer and inner cylinders of your water tank are not deformed, there should be no large Secondary foam problem caused by heavy foam. the temperature will be right after that and the reaction is complete.