Simply install it on the water inlet pipe of the solar water heater.
It's just that ordinary booster water pumps cannot withstand high temperatures if the temperature of the hot water in the solar water heater is heated above 80 degrees and the Hot water flows through the booster pump. using water will damage the booster pump.
It is recommended to add a shut-off valve above the booster pump and a bypass line and valve next to the booster pump. When water is supplied, close the bypass pipe valve and open the outlet valve of the booster pump; When using hot water, close the outlet valve of the booster pump and open the valve of the bypass pipe.