In this study, combine operation of air source heat pump and vacuum tube solar collector system was experimentally observed. Contribution of heat pump system on solar collector system performance was determined. Solar collector experimentation setup was constructed with 30 It water storage tank and 4 items vacuum tube. Heat pump condenser which is in the form of pipe coil was placed into the water storage tank. System evaporator is fan assisted aluminium fin and 2400 W capacities. Heat pump compressor is 745 W power. Temperature was controlled by 303-363 K range thermostat. During the experimentations solar radiation intensity, heating time and temperature of water was recorded. Experimentations were repeated for three different operation conditions. In the first day, solar collector and heat pump system, the second day, only solar collector and on the third day, only heat pump system was operated and experimentation was completed. It is determined that, the system efficiency was enhanced about 5% according to the evaluations.