Abstract: The specific objective of this study is to find or develop new models that can improve the efficiency of solar water heater. The research conducted using the experimental method to compare the water temperature result of double-plate solar water heater and double-wave solar water heater. We investigate the cover glass number intake flow rate and initial heating the intake working fluid that can improve the efficiency of both models. The results are: the best efficiency of the solar water heater uses triple-layer glass cover, if it compared to the double layers and single layer cover glass number; the efficiency of solar water heaters increases linearly to the intake water flow rate; initial heating the intake working fluid step by step causes the efficiency of solar water heater close to zero. Generally, the performance of double-wave absorber solar water heater is better than double-plate absorber solar water heater.