Divided into cold water meter and hot water meter.
According to the medium temperature, it can be divided into cold water meter and hot water meter. The water temperature is 30 °C, which is the boundary line.
(1) Cold water meter: A water meter with a medium lower limit temperature of 0 ° C and an upper limit temperature of 30 ° C.
(2) Hot water meter: A water meter with a medium lower limit temperature of 30 ° C and an upper limit of 90 ° C or 130 ° C or 180 ° C.
