A solar collector is a device that converts solar energy into heat. This paper presents an experimental study on the influences of volumetric flow rate and inclination angle on the performance of a solar collector. The tests were conducted on a solar energy demonstration system (ET200), which consists of a solar collector, a storage tank, a control and command cabinet and a high power lamp simulating solar energy. For radiation intensity of 1.033 kW/m(2) and inclination angle of 0 degrees, the results showed that the efficiency of the collector followed a linear relationship versus the flow rate; eta = 0.68 x Q(v) + 49.79 and presented a coefficient of correlation (R-2) of 0.9898. Similarly, the increase of the inclination angle from 0 degrees to 6 degrees increased the effectiveness of the collector. A linear relationship; eta = 0.43 x alpha + 53.07 with a high coefficient of determination (R-2 = 0.967) relates the collector efficiency to the inclination angle. It is important to operate at higher mass flow rates and take the collector angle at 0 degrees in order to reach its meaning full efficiency (heating water). (C) 2013 Elsevier Ltd. All rights reserved.