{"product_id":"hayward-h400fdn-universal-h-series-natural-gas-400-000-btu-low-nox-gas-heater","title":"Hayward | H400FDN | Universal H-Series Natural Gas 400,000 BTU Low NOx Gas Heater","description":"\u003cp data-start=\"387\" data-end=\"928\"\u003eThe \u003cstrong data-start=\"391\" data-end=\"468\"\u003eHayward H400FDN Universal H-Series 400,000 BTU Low NOx Natural Gas Heater\u003c\/strong\u003e is a high-performance, energy-efficient solution designed to provide reliable heating for your pool or spa. Engineered with a standard cupro-nickel heat exchanger, this heater offers excellent saltwater and chemical corrosion resistance, ensuring longevity and durability. The exclusive \"Totally Managed\" water flow design and patented header bypass system enhance hydraulic efficiency, reducing pump run-time and resulting in significant energy cost savings.\u003c\/p\u003e\n\u003chr data-start=\"930\" data-end=\"933\"\u003e\n\u003ch3 data-start=\"935\" data-end=\"956\"\u003e\u003cstrong data-start=\"939\" data-end=\"956\"\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"957\" data-end=\"1524\"\u003e\n\u003cli data-start=\"957\" data-end=\"1038\"\u003e\n\u003cp data-start=\"959\" data-end=\"1038\"\u003e\u003cstrong data-start=\"959\" data-end=\"1000\"\u003eStandard Cupro-Nickel Heat Exchanger:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eProvides superior corrosion resistance, ideal for saltwater and chemically treated pools.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1039\" data-end=\"1122\"\u003e\n\u003cp data-start=\"1041\" data-end=\"1122\"\u003e\u003cstrong data-start=\"1041\" data-end=\"1084\"\u003eExclusive \"Totally Managed\" Water Flow:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eEnsures consistent water velocity through all tubes for faster heating and improved reliability.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1123\" data-end=\"1197\"\u003e\n\u003cp data-start=\"1125\" data-end=\"1197\"\u003e\u003cstrong data-start=\"1125\" data-end=\"1159\"\u003ePatented Header Bypass Design:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eEnhances hydraulic performance, reducing pump run-time and saving energy.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1198\" data-end=\"1262\"\u003e\n\u003cp data-start=\"1200\" data-end=\"1262\"\u003e\u003cstrong data-start=\"1200\" data-end=\"1222\"\u003eLow NOx Emissions:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eMeets or exceeds air quality emission standards, including California's stringent regulations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1263\" data-end=\"1353\"\u003e\n\u003cp data-start=\"1265\" data-end=\"1353\"\u003e\u003cstrong data-start=\"1265\" data-end=\"1313\"\u003e2\" x 2 1\/2\" CPVC Union Plumbing Connections:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eFacilitates easy installation and service.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1354\" data-end=\"1420\"\u003e\n\u003cp data-start=\"1356\" data-end=\"1420\"\u003e\u003cstrong data-start=\"1356\" data-end=\"1380\"\u003eForced Draft System:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eMaintains precise air flow through the combustion chamber, eliminating the need for a high-wind stack.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1421\" data-end=\"1524\"\u003e\n\u003cp data-start=\"1423\" data-end=\"1524\"\u003e\u003cstrong data-start=\"1423\" data-end=\"1445\"\u003eLED Control Panel:\u003c\/strong\u003e \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eProvides digital temperature readout and diagnostics for quick identification of components that might need service.\u003c\/span\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1526\" data-end=\"1529\"\u003e\n\u003ch3 data-start=\"1531\" data-end=\"1556\"\u003e\u003cstrong data-start=\"1535\" data-end=\"1556\"\u003eProduct Overview:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1557\" data-end=\"2059\"\u003eThe \u003cstrong data-start=\"1561\" data-end=\"1638\"\u003eHayward H400FDN Universal H-Series 400,000 BTU Low NOx Natural Gas Heater\u003c\/strong\u003e combines advanced technology with user-friendly features to deliver optimal performance. Its compact design allows for flexible installation, and the forced draft system ensures consistent heating regardless of external weather conditions. Whether you're upgrading your existing system or installing a new one, this heater offers the reliability and efficiency you need to maintain a comfortable pool or spa environment.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable class=\"m-product-table\"\u003e\n\u003ctbody\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eActive Defrost\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eApplication\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNew Construction, Renovation, Aftermarket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eBoost Mode\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eBrand\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eHayward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eChannel\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eExpert Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eCircuit Amps\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e5.5000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eCooling Capability\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\n\u003cdiv class=\"spec-label p-2 w-full md:min-w-[220px] md:max-w-[220px] border-r border-[#e1e6ef] font-bold\"\u003e\u003cspan\u003eExchanger Material\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/th\u003e\n\u003ctd\u003e\u003cspan\u003eCupronickel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eFuel Type\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNatural Gas\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eGTIN\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e610377027250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eHeating Capacity (BTU\/hr)\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e400000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eHertz\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eKilowatts\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e117 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eLabor Warranty\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e1-year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eLow Ambient Operation\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eMaster Carton Qty\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eMaximum Fuse Breaker Size (Amps)\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e15.0000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003ePallet Qty\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eParts Warranty\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e3-year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003ePhase Heaters\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e1.0000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003ePool Type\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eIn Ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eRear Clearance - Heaters\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e6 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eRefrigerant\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eSeries Heaters\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eUniversal HSeries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eSide Clearance - Heaters\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e12 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eSilent Mode\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eWater Flow Rate Max\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"m-product-table__row\"\u003e\n\u003cth class=\"m-product-table__row-header\"\u003eWater Flow Rate Min\u003c\/th\u003e\n\u003ctd class=\"m-product-table__item\"\u003e30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLiterature and Manuals:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/hayward.com\/media\/akeneo_connector\/asset_files\/L\/I\/LITUHS22C_Universal_HSeries_Brochure_Bilingual_d5bc.pdf\" class=\"a-btn a-btn--text brochure-link\" target=\"_blank\"\u003e\u003cspan class=\"a-btn--text-inner\"\u003e\u003cspan class=\"a-btn__label\"\u003eUniversal H Series Brochure (LITUHS22C) Bilingual\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/hayward.com\/media\/akeneo_connector\/asset_files\/C\/u\/CuproNickelSellSheet_b2bc.pdf\" class=\"a-btn a-btn--text brochure-link\" target=\"_blank\"\u003e\u003cspan class=\"a-btn--text-inner\"\u003e\u003cspan class=\"a-btn__label\"\u003eCupro Nickel Sell Sheet\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"a-btn--text-inner\"\u003e\u003cspan class=\"a-btn__label\"\u003e\u003ca href=\"https:\/\/hayward.com\/media\/akeneo_connector\/asset_files\/U\/H\/UHSa_UHS_HTG_5092.pdf\" class=\"a-btn a-btn--text brochure-link\" target=\"_blank\"\u003eUHS Heater How To Guide\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"a-btn--text-inner\"\u003e\u003cspan class=\"a-btn__label\"\u003e\u003ca href=\"https:\/\/hayward.com\/media\/akeneo_connector\/asset_files\/5\/1\/51300004201_RevE_fb9b.pdf\" class=\"a-btn a-btn--text brochure-link\" target=\"_blank\"\u003eIn-Ground Pool\/Spa Gas Heaters Owner's Manual\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"a-btn--text-inner\"\u003e\u003cspan class=\"a-btn__label\"\u003e\u003ca href=\"https:\/\/hayward.com\/media\/akeneo_connector\/asset_files\/u\/h\/uhs_qrg_af48.pdf\" class=\"a-btn a-btn--text brochure-link\" target=\"_blank\"\u003eUniversal H-Series Quick Start Guide\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":50134922690872,"sku":"H400FDN","price":3799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/6319\/9544\/files\/Screenshot2025-04-30104931.png?v=1777922578","url":"https:\/\/appaetechpoolsupply.com\/products\/hayward-h400fdn-universal-h-series-natural-gas-400-000-btu-low-nox-gas-heater","provider":"AppaeTech Pool Supply","version":"1.0","type":"link"}