With the development and growth of renewable energy application technology, the technology of using solar energy to supply domestic hot water is becoming increasingly mature. Centralized solar hot water systems play an important role in alleviating energy problems, and scholars from all walks of life are studying how to design solar building hot water projects. The solar hot water system uses a solar collector to collect the heat of the sun, and the collected heat is transmitted to a water storage tank for insulation through a circulating water pump. It is matched with appropriate energy sources such as electricity, gas, and fuel to heat the water in the tank and become a relatively stable quantitative energy source. Compared to household independent systems, centralized solar hot water systems have gradually become the mainstream form of solar hot water systems due to their high degree of integration, good integration with buildings, easy operation and maintenance, mutual balance of water usage among users, and easy implementation of instant heating. This article designs a 10 t/d building solar hot water project.