When we purchased our new home in Mesa, we knew one of the first things we wanted to get was a solar pool heater. I contacted Heliocol and their sales rep, Michael Chung, came to visit us and answer any and all questions we had. My wife and I were both extremely impressed with Michael's knowledge of the industry and Heliocol in particular. We had our system installed in February of 2016 and the first day we swam was March 3rd. The pool hit 80 and we felt like we just had to go in, even though our preference is 88. Since early to mid April our pool as been between 86-88 degrees. We have been extremely happy with our Heliocol solar pool heater and I would highly recommend Michael Chung to anyone that wants to know everything about solar pool heating.