The invention relates to a heating meter. It includes: the not closed shell, in the shell around the no closed two side separately installs the temperature control box and the change tube, on the temperature control box has a water inlet, two water outlets, on the change tube has two water inlets and a water outlet, between the one outlet of the temperature control box and the inlet of the change tube connects by the cycle tube, between the another outlet of the temperature control box and the another inlet of the change tube installs a heat water meter, on the outlet of the temperature control box which connected to the heat water meter installs a temperature control valve, on which connects the distort metal, the other end of the distort metal fixed on the temperature control box. The invention has the simple craft, low cost, can carry on the mass production by the existing technology, with science, rationality, accuracy, durability, energy efficiency, temperature balanced adjustment and so on characteristics. It can ensure the fair, reasonable, fair and legitimate transactions, and use science to build social harmony and development.