I had a pool guy install a custom fully automated By-Pass of my pool heater. I have pool solar so I use the heater as a heat boost occasionally for the spa only. I can now operate the heater Bypass on and off remotely. I use it in the spa, with my phone by way of the Jandy iAuqualink 2.0. I use it If I need a quick bump in temperature. In addition, I don't have to worry about my heater shedding cooper and staining in my pool when the chlorine levels get too high. I have had heater related plaster staining from time to time. I know it was a highly unusual request. And most pool repair guys didn't want to attempt it. I had a devil of a time finding someone who would attempt it. But I found a guy (finally) who knew exactly what to do. It was refreshing to find someone who really knows his stuff about pool equipment and not afraid to tackle a very uncommon request. He used 2 check valves and a Jandy valve actuator. Work great!