Yes, solar heating system can not only provide hot water for your home, it can also heat the underfloor heating.
Solar floor heating system heats the floor by circulating hot water in a closed pipe laid under the floor, and heats the room through ground radiation conduction and convection conduction.
The whole ground is a radiator, which conducts from bottom to top according to the heat storage and heat radiation laws of the ground itself, and evenly heats the room.
If you have a ready-made house without underground pipes, it’s okay. You can also install radiators combined with a solar heating system to bring the heat generated by the solar energy to the radiator to keep the house warm.