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Jandy JXi™ JXI400N Natural Gas Pool and Spa Low-NOx Heater 400K BTU. The Jandy Jxi Pool Heater 400 Natural heater sets the standard in pool and spa heating technology with its ultra-compact size, lightweight design and installation flexibility — making it a top choice for pool professionals and pool owners everywhere. The high-efficiency, low-NOx JXi is available in three BTU sizes, 200K, 260K, 399K, and offered in both natural and propane gas models.