Recently, the residential area has installed a meter (an electronic device installed on the water inlet and outlet) for the heating of each household. The measurement principle is generally:

1. Keep the indoor temperature and the required indoor heat unchanged.

2. When the flow rate decreases, the outlet temperature decreases, but the heat absorbed indoors decreases and the indoor temperature decreases.

if the indoor temperature is high (25 ~ 27), the method of reducing the flow can be adopted to cool down.