In Cuernavaca, Morelos in the country of Mexico, the IIE (Electrical Research Institute) built a Parabolic Trough Solar Collector in order to have an experimental station and to satisfy the water heating demand used for sanitary services in a Automobile Company. The IIE built the system and put it on function but they did little theoretical research on it, and they are missing a very important factor which is the characteristic equation for this special collector. The best effort was done in order to complete this thesis, even thought lots of measurements where missing, and with other ones the values where not reliable as wanted. But with justifications and suppositions, the calculations where done and the objective was reached in the best way possible. Some recommendations are done too in order to get better values if the chance of make some tests to the collector appears, or if these equations are applied to other collectors. In the study first the equations in order to reach the theoretical values was made, then after some justifications for some values, the measured ones where introduced into the equations and the results where putted into tables and then into graphs, in order to watch better and identify better the resu