The article discusses using PVT technology in a solar house to provide hot water and heating. By analyzing real data and using a simulation model, the researchers found that adding more PVT panels can reduce energy consumption and payback time. They discovered that with 4 PVT panels, the system can achieve zero energy consumption, and the payback period can be reduced to 6.5 years. The study highlights the importance of designing the water tank heating system and matching energy supply with demand for efficient PVT energy systems in buildings.