The experimental work in this paper compares the performance of a solar collector with triangular tubes placed over grooves of a V-corrugated absorber plate and a solar collector with circular tubes placed on a flat plate under the same environmental conditions and at four flow conditions (2,3,5,7) Lpm. The results were, The solar collector with triangular tubes placed over grooves of V-corrugated absorber plate is more efficient in thermal conductivity than the solar collector with circular tubes placed on the flat plate, because rises temperature of the triangular riser tubes result of global warming in the grooves of the corrugated plate, also because the surface area of the corrugated plate V with grooves is greater than the surface area of the flat plate, and as a result, the amount of solar radiation falling on it is greater than the amount of solar radiation falling on the flat plate. Additionally, the triangle-shaped tubes have a larger surface area of contact with the V-corrugated absorber plate than the circular tubes do with the flat plate. This enhances the heat transfer from the V-corrugated plate to the triangle-shaped tubes, which increases the heating of the water used. Increasing the water flow in the pipes of both solar collectors increases the amount of heat exchange between the pipes and the water inside them because there are more water passages inside the solar collector when the flow is high, which increases the water's ability to absorb heat from the sun's rays. This raises the solar collector's efficiency. Four water flows, each at a rate of 2, 3, 5, and 7 l/min, were used in this study.