I would like to thank you again for providing The Sentry Pool Heater system that you installed at our facility in 2017. It is very reassuring that everything is still in excellent condition. I am still amazed after two years with this swimming pool heating system and how much easier my life has been without having to deal with the constant stress that the old pool heating system had challenged me with. No more working on boilers in the middle of the night and in the dead of winter when it got cold enough to freeze up the air pressure switches. Believe it or not I actually spent one Christmas Day working on those darn boilers! The Sentry Pool Heater is almost 100% maintenance free and with 98% thermal efficiencies almost just as efficient! The Sentry Pool Heater honestly has been a life changer not just for me but our whole organization since the swimming programs are no longer impacted by malfunctioning boilers. The Sentry Pool Heater is very much appreciated at Blue Valley Aquatic Center.