The low-potential sources in combination with solar devices used in supply heating systems present a perspective alternative to fossil energy in both economic and environmental point of view. The issue of low-temperature heating and renewable energy sources at present, when humanity stands on the threshold of fuel-energy sources selection, is extraordinarily important. Currently the solar energy, geothermal water energy and environmental energy used in supply of heating systems with low-energy potential present a perspective alternative in comparison to limited fossil energy. The energy utilization appropriateness depends on geographic area and climate zone. The article presents and solves the design issue of low-temperature heat pump system in combination with solar panel devices.