The circulating water pump can only be installed on the hot water supply main pipe, and it must be equipped with a check valve and a flow regulating valve. Therefore, the circulating water pump does not serve to circulate the water, but to pressurize the water. It is actually a pressurized water pump. , It is similar to the cold water booster pump in the water supply project. The water in the reservoir is pumped to the water tower, and then delivered to the user by gravity.

Advantages: no explosion hazard; no pressure relief problems in the boiler room; saving steel and simple technology; scrap boilers can be reused; canceling the water supply pump; power failure protection; durable; saving users' various investments.