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In order to assess the feasibility of solar water heater heating renovation in hot-summer and cold-winter areas, 761 households were investigated by field investigation method, and the pre-sent situation of heating and the application status of solar water heater in this area was mastered. According to the research data, the energy saving and CO2 emission reduction of solar water heater heating renovation are calculated, and the energy saving and economy of single-family residential system renovation are analyzed. The results show that the energy saving and CO2 emission reduction of solar water heater are 51.7 billion MJ and 5.9 million t, respectively. The energy saving rate of the 6 m2 solar water heater applied to the heating renovation can reach 32.6%, and the payback period of the initial investment is only 2.7 a. It shows that there are certain basic conditions and prospects for solar water heater heating in this area.