The new roof solar water heater is to convert renewable energy sources by chemical energy conversion mode. Under the premise that the roof meets the installation requirements of solar water heater, water heater can be integrated with the roof. The integrated or split-type solar water heater can be installed on pitched roof or flat roof. If the roof doesn’t meet the requirements, water heater can be either installed on the window-sill walls horizontally or walls between windows vertically, which can not only meet the water needs of users, but also enrich the building elevation and beautify the environment. A variety of feasible schemes of solar water heater and building integration are provided for the existing residential heating house reconstruction, which is beneficial to the utilization and popularization of solar water heater.