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.

Operating at 84% thermal efficiency, the JXi 400N CUNI meets demanding DOE energy standards while keeping fuel costs manageable. Full compatibility with Jandy AquaLink¨ systems lets you manage heating remotely through the iAquaLinkª app from your smartphone. For owners who want to squeeze even more efficiency from their system, optional VersaFloª Integrated Bypass technology is available to optimize water flow and reduce energy consumption.

Surpasses strict DOE Energy Efficiency requirements with an 84% thermal efficiency rating and low-NOx combustion design.

Specifications

• Brand: Jandy
• Part Number: JXI400NN

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