To work the best, they should be at the same angle as originally installed. Be sure that there are air vents at any high points in the piping where air can acculmulate. Be certain that the pump is operating properly.: During remodeling we relocated our solar water heater : and panels. This heater was in excellent working order.: The tank itself was relocated higher than before and the : panels were placed on the roof of a new dormer, directly : above their previous location. The panels are located : lower than the tank, they are on a less steep angle than : previously. The system works well electrically.: There is hot water in the tubing exiting the panels but : almost none of it flows to the rest of the system and : therefor we get only warm water (at best) at home.: Any suggestions???? Thanks