The solar energy is clean, environmentally renewable energy and can be used in both electricity and heat functional. In part of heat production, commonly used a solar collector that can integrate with many techniques for offering the highest thermal performance which one method is to use the phase change material (PCM). The goal of this research is to study the thermal performance of solar collector with and without phase change material (PCM) riser. The various water mass flow rate per collector area were observed at 0.01, 0.02 and 0.03 kg/s·m², respectively. The two novel solar collectors were built in a single copper tube as absorber plate tube with 28. 7 mm of outside diameter, 1 mm of thickness and 1,000 mm of length inserted with copper tube riser with diameter of 10 mm and 16 mm which were filled with RT42 phase change material (a melting point between 38 ℃ to 42 ℃). The novel solar collectors were installed for thermal performance testing following ASHRAE standard 93-2003 comparing with the solar collector without PCM riser. The experiment results show that both of the novel solar collectors were given the thermal performance greater than the solar collector without PCM riser. The novel solar collector that integrates with phase change material riser of 16 mm diameter ( PCM1) at 0. 03 kg/ s m² demonstrated the best of FR( τα) e and FRUL of 0. 811 and 9. 753 ( W/ m²K) following by the mass flow rate of 0.02 kg/s m² and 0.01 kg/s m², respectively. For the novel solar collector integrated with phase change materials riser of 10 mm diameter (PCM2) gave the FR(τα)e and FRUL of 0.815 and 11.140 (W/m² K) at 0.02 kg/s m² following by the results of mass flow rate 0.03 kg/s m² and 0.01 kg/s m², respectively.