At present the metropolitan zone of Guadalajara presents high degrees of contamination, and the place where this home Villas Miravalle, belonging to the organism: Integral Development of the Family (DIF), for which calculation and design, our solar parabolic trough collector for water heating. The index of the metropolitan air quality (IMECA) presents the highest levels. Nowadays this lodging that is adjacent to the Technological University of Jalisco, possesses a system of gas heaters and about 100 children and girls attend. But it does not possess an alternative system to supply of warm water, to minor cost and impact, as solar heaters. Besides the interest of contributing in actions to the efficient use of energy, reduction to the environmental impact, it supports children's home since his budget is limited. What encourages the interest to he calculated and I design this system termosolar in order that the users belonging to this lodging, Once already manufactured and installed could use the warm sanitary water, with the minor consumption of possible gas. Was also calculated this solar water heater of parabolic trough collector, because in addition to heat hot water in this case in a hostel, you can install in countless of micro, small and medium-sized enterprises (SMES), for the realization of their processes.