Electric heating projects are conducive to improving atmospheric environment and promoting new energy power consumption, which are important objects of power demand side management. At present, the economy of electric heating projects is poor, and large scale construction causes additional burdens on the government and power grid companies. In order to explore the feasible scheme for realizing the sustainable development of electric heating, the critical tariff model is constructed. Based on boundary condition data obtained by investigation, maximum affordable tariff of three kinds of electric heating projects is calculated. Combined with calculation of the transmission and distribution price and analysis of the lowest affordable price of wind power projects in northern Hebei province, the economic feasibility of centralized electric heating projects in Beijing is discussed. The other obstacles of electric heating projects participating in power transactions is analyzed, and suggestions of policies are put forward at last. The results of the study show that under the condition of no or less subsidy, part of electric heating projects can generate profits through electricity transactions, financial subsidies and burdens of power grid corporations can be reduced significantly, thus realizing the sustainable development of electric heating.