{"product_id":"jandy-jxi-jxi400n-natural-gas-pool-spa-heater-399-000-btu","title":"Jandy JXi JXI400N Natural Gas Pool \u0026 Spa Heater - 399,000 BTU","description":"\u003cp\u003eJandy JXi JXI400N high-efficiency Low-NOx natural gas pool and spa heater. Its compact, lightweight design provides fast, reliable heating while allowing flexible installation and easy replacement applications.\u003c\/p\u003e\u003ch3\u003eModel details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHeating capacity: 399,000 BTU\u003c\/li\u003e\n\u003cli\u003eFuel type: Natural Gas\u003c\/li\u003e\n\u003cli\u003eHeat exchanger: Copper\u003c\/li\u003e\n\u003cli\u003eThermal efficiency: 84%\u003c\/li\u003e\n\u003cli\u003eLow-NOx design\u003c\/li\u003e\n\u003cli\u003eCompatible with Jandy AquaLink and iAquaLink automation\u003c\/li\u003e\n\u003cli\u003eFor swimming pools and spas\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFuel and heater sizing\u003c\/h3\u003e\u003cp\u003eThis is the natural gas configuration. Confirm that your supply matches before ordering. Gas-heater BTU input is the fuel input rating; usable heat output also depends on thermal efficiency. Pool volume, starting water temperature, desired warm-up time and heat loss determine the capacity needed.\u003c\/p\u003e\u003ch3\u003eInstallation requirements\u003c\/h3\u003e\u003cp\u003eA qualified installer should confirm gas-line capacity and pressure, electrical supply, water flow, equipment clearances and installation altitude. Indoor installations need the correct manufacturer-approved venting arrangement. Check the existing pad and plumbing connection positions when replacing another heater; matching BTU size alone does not guarantee a direct fit.\u003c\/p\u003e\u003ch3\u003eComplete the installation\u003c\/h3\u003e\u003cp\u003eSite-specific gas fittings, electrical work, venting accessories and installation labor are separate. For remote control, verify the listed interface and any required network or automation hardware. Maintain the manufacturer's water-balance targets and keep the circulation system in good condition to protect the heat exchanger.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.jandy.com\/en\/products\/pool-heating\/heaters\/jxi\" target=\"_blank\" rel=\"noopener\"\u003eManufacturer specifications and installation documents\u003c\/a\u003e\u003c\/p\u003e","brand":"Mikan Supply","offers":[{"title":"Default Title","offer_id":44801151991850,"sku":"LAR-15-500","price":3796.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/6875\/8570\/files\/heater-jxi400n-epool-2_4835c06d-3c2e-4867-99fe-a9058d6e1c85.png?v=1790308100","url":"https:\/\/mikanpool.com\/products\/jandy-jxi-jxi400n-natural-gas-pool-spa-heater-399-000-btu","provider":"MIKAN POOL SUPPLIES","version":"1.0","type":"link"}