The system includes a structure integrated with the building—the kang (including an internal flue system), radiant heating hot water coils, indoor circulation small water pumps, a distributor, a collector, an expansion tank, an exhaust valve, a temperature control valve, and a domestic gas boiler. This invention combines the advantages of a clean indoor environment from a hot water heating system with the energy-saving benefits of traditional kang low-temperature radiant heating. Whether using a centralized heating system or a decentralized heating system, it achieves diversification in heat source selection. Combined with the kitchen exhaust waste heat heating system, it not only ensures winter heating comfort but also maintains the traditional living habits of small town residents in the Northeast. It achieves energy-saving and environmental protection effects, meeting the requirements of sustainable development.