{"product_id":"jandy-jxiq400nnk","title":"Jandy JXiQ 399K BTU Natural Gas Pool \u0026 Spa Heater with Cupro-Nickel + VersaFlo | JXIQ400NNK","description":"\u003ch2\u003eKey Benefits + Heater Configuration\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e399,000 BTU input for high-capacity pool and spa heating.\u003c\/li\u003e\n  \u003cli\u003eNatural gas configuration for installations designed for natural gas service.\u003c\/li\u003e\n  \u003cli\u003eCupro-nickel heat exchanger with polymer headers on model JXIQ400NNK.\u003c\/li\u003e\n  \u003cli\u003eFactory-installed VersaFlo Integrated Bypass directs water through the heat exchanger when heat is needed.\u003c\/li\u003e\n  \u003cli\u003e84% thermal efficiency.\u003c\/li\u003e\n  \u003cli\u003eJXiQ sensors, a larger display, heat-up time estimates, and connected status information help simplify operation and diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eQuick Product Summary\u003c\/h2\u003e\n\u003cp\u003eThe Jandy JXiQ JXIQ400NNK is a 399,000 BTU natural gas pool and spa heater configured with a cupro-nickel heat exchanger, polymer headers, and a factory-installed VersaFlo Integrated Bypass. It is intended for pool and spa applications where this exact JXiQ configuration matches the fuel, plumbing, flow, electrical, ventilation, and equipment-pad requirements. Confirm the complete model number and installation requirements before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eBest For\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eIn-ground pool and spa heating applications that require a 399,000 BTU natural gas heater.\u003c\/li\u003e\n  \u003cli\u003eProjects calling for a cupro-nickel heat exchanger and polymer headers.\u003c\/li\u003e\n  \u003cli\u003eInstallations that specifically call for the factory-installed VersaFlo Integrated Bypass configuration.\u003c\/li\u003e\n  \u003cli\u003eNew installations or heater replacements reviewed by a qualified pool professional.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy This Matters\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCorrect heater sizing and fuel selection are critical to safe, effective operation.\u003c\/li\u003e\n  \u003cli\u003eVersaFlo automatically directs water through the heat exchanger when heating is needed.\u003c\/li\u003e\n  \u003cli\u003eJXiQ sensors monitor operating conditions and support easier troubleshooting.\u003c\/li\u003e\n  \u003cli\u003eHeat-up time estimates and at-a-glance status information make heater operation easier to understand.\u003c\/li\u003e\n  \u003cli\u003eExact model identification helps prevent ordering the wrong JXiQ configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCommon Signs You Need This \/ Use This When\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eYou are replacing an aging natural gas pool or spa heater and the project calls for a 399,000 BTU input model.\u003c\/li\u003e\n  \u003cli\u003eYou specifically need Jandy model JXIQ400NNK rather than another JXiQ fuel, exchanger, header, or bypass configuration.\u003c\/li\u003e\n  \u003cli\u003eYour installation calls for a cupro-nickel heat exchanger with polymer headers.\u003c\/li\u003e\n  \u003cli\u003eYou want the JXiQ platform with factory-installed VersaFlo Integrated Bypass.\u003c\/li\u003e\n  \u003cli\u003eA qualified installer has confirmed the gas, plumbing, flow, ventilation, electrical, and equipment-pad requirements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eJandy\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eJXiQ\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eJXIQ400NNK\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eNatural Gas Pool \u0026amp; Spa Heater\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFuel Type\u003c\/td\u003e\n\u003ctd\u003eNatural Gas\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBTU Input\u003c\/td\u003e\n\u003ctd\u003e399,000 BTU\/hr\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThermal Efficiency\u003c\/td\u003e\n\u003ctd\u003e84%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Exchanger\u003c\/td\u003e\n\u003ctd\u003eCupro-nickel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeader Type\u003c\/td\u003e\n\u003ctd\u003ePolymer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIntegrated Bypass\u003c\/td\u003e\n\u003ctd\u003eFactory-installed VersaFlo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Flow Range\u003c\/td\u003e\n\u003ctd\u003e30–100 GPM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Connection\u003c\/td\u003e\n\u003ctd\u003e2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGas Connection\u003c\/td\u003e\n\u003ctd\u003e3\/4 in. NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProduct Weight\u003c\/td\u003e\n\u003ctd\u003e126 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCabinet Size\u003c\/td\u003e\n\u003ctd\u003e22.9 in. W × 22.1 in. D × 26.5 in. H\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e052337330213\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatibility \/ Fitment Notes\u003c\/h2\u003e\n\u003cp\u003eJXIQ400NNK is a specific JXiQ configuration and should not be treated as a universal replacement for every 400K-class heater. Confirm natural gas service and capacity, water-flow requirements, 2-inch plumbing connections, equipment-pad clearances, ventilation, electrical requirements, and applicable local codes before purchase. Match the complete model number because JXiQ variants differ by fuel type, heat-exchanger construction, header configuration, and bypass options.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation \/ Use Notes\u003c\/h2\u003e\n\u003cp\u003eProfessional installation is recommended for this heater. Gas piping, electrical connections, plumbing, ventilation, water flow, commissioning, and clearances should be verified by qualified professionals following the current Jandy installation manual and local codes. Do not select or install the heater by BTU rating alone; the complete application should be reviewed for compatibility before the unit is put into service.\u003c\/p\u003e\n\n\u003ch2\u003eBuy with Confidence\u003c\/h2\u003e\n\u003cp\u003eBenchmark Pool Supply works with pool equipment every day and can help customers identify the correct heater configuration before purchase. We focus on clear model identification, practical equipment knowledge, and fitment checks that help reduce wrong-equipment orders. For JXIQ400NNK, confirm the full model number and installation requirements before moving forward.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs the Jandy JXIQ400NNK a natural gas heater?\u003c\/h3\u003e\n\u003cp\u003eYes. JXIQ400NNK is configured for natural gas and has a 399,000 BTU input.\u003c\/p\u003e\n\n\u003ch3\u003eWhat heat exchanger does the JXIQ400NNK use?\u003c\/h3\u003e\n\u003cp\u003eThis model uses a cupro-nickel heat exchanger with polymer headers. Match the complete model number because other JXiQ configurations use different heat-exchanger and header combinations.\u003c\/p\u003e\n\n\u003ch3\u003eDoes the JXIQ400NNK include VersaFlo?\u003c\/h3\u003e\n\u003cp\u003eYes. This configuration includes a factory-installed VersaFlo Integrated Bypass.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the thermal efficiency of the JXIQ400NNK?\u003c\/h3\u003e\n\u003cp\u003eThe JXIQ400NNK is rated at 84% thermal efficiency with a 399,000 BTU input.\u003c\/p\u003e\n\n\u003ch3\u003eWhat should I verify before ordering this heater?\u003c\/h3\u003e\n\u003cp\u003eConfirm natural gas service and capacity, plumbing size and flow, equipment-pad space, ventilation, electrical requirements, and local installation requirements. A qualified pool professional should verify the complete application before installation.\u003c\/p\u003e","brand":"Jandy","offers":[{"title":"Default Title","offer_id":67620534845514,"sku":"JXIQ400NNK","price":4142.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/6580\/7178\/files\/03_jxiq_400nk_versaflo.png?v=1791225712","url":"https:\/\/benchmarkpoolsupply.com\/products\/jandy-jxiq400nnk","provider":"Benchmark Pool Supply","version":"1.0","type":"link"}