Description
OEM Jandy JXi 400N Natural Gas Pool & Spa CUNI Heater | 399,000 BTUs. Step up to superior corrosion resistance with the Jandy JXi 400N CUNI, a natural gas heater featuring a cupronickel heat exchanger that delivers 399,000 BTUs of heating output for both residential and professional pool and spa applications. The cupronickel construction is specifically chosen for its ability to resist the corrosive effects of aggressive water chemistry, salt systems, and high mineral content — making this model the preferred choice for challenging water conditions. Weighing just 126 lbs in a compact chassis, installation is straightforward and the unit frequently drops into existing equipment pads as a direct replacement for older heaters like the MasterTemp¨ or Max-E-Therm¨, typically without plumbing changes.
