The XL series pool heater is engineered to capture more of the free heat from the surrounding air, AquaComfort Solutions innovated and perfected the science of pool heating. The XL series' Turboguard titanium heat exchanger is virtually immune to damge from unbalanced water chemistry and our fan assembly uses less energy and runs almost silently. It's a precision package that lasts longer and maintains its efficiency year-after-year. Gas heaters lose efficiency every year starting the day they're installed. Lower amperage requirements than the competition - starting at only 20 amps - will save you money on the installtion too.