{"product_id":"hayward-universal-h-series-in-ground-natural-gas-heater-with-omnix-400k-hs400fdn","title":"Hayward Universal H-Series In-Ground Natural Gas Heater with OmniX 400K | HS400FDN","description":"\u003ch2\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBring fast, dependable heating and modern smart control to your pool or spa with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHayward Universal H-Series Natural Gas Heater with OmniX 400K | HS400FDN\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Delivering approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e400,000 BTU of heating power\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, this high-capacity heater is designed for in-ground swimming pools and pool\/spa combinations that require fast temperature recovery, durable construction, and advanced automation compatibility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HS400FDN combines Hayward’s proven Universal H-Series heating platform with the new \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX embedded intelligence and Universal Display\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. This provides enhanced programmability, advanced diagnostics, intuitive equipment control, and connected functionality through the Hayward OmniX ecosystem.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA durable \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecupro-nickel heat exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e provides excellent resistance to corrosion and premature wear, while Hayward’s totally managed water-flow system helps maximize hydraulic efficiency. Low NOx emissions meet applicable clean-air requirements, making this an excellent choice for both new installations and replacement applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e400,000 BTU class natural gas heater\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eManufacturer model \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHS400FDN\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eBuilt-in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX smart control technology\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHayward Universal Display\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAdvanced diagnostics and programming\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRemote connectivity capability\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDurable cupro-nickel heat exchanger\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e84% thermal efficiency\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLow NOx emissions\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eForced-draft combustion\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSilicon nitride hot-surface ignition\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTotally managed water-flow system\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFront-panel-only service access\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUniversal left or right electrical connection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for easy replacement installations\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompatible with Hayward Omni automation and other supported automation platforms\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eProduct Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable height=\"503\" style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 45.5724%;\"\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003cth style=\"width: 51.5958%;\"\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eHayward\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eSeries\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eUniversal H-Series\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eHS400FDN\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eFuel Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eNatural Gas\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eBTU Input\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e399,900 BTU\/hr\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eNominal Rating\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e400,000 BTU\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eThermal Efficiency\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e84%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eHeat Exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eCupro-Nickel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eMinimum Water Flow\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e30 GPM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Water Flow\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e125 GPM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eGas Connection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e3\/4\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eControl Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eDigital \/ OmniX\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eIgnition\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eHot Surface Ignition\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eElectrical\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e120\/240 VAC, Single Phase\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eWidth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e34\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eDepth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e29.5\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eHeight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003e24\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003cstrong\u003e\u003cspan\u003eProduct Weight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003cspan\u003eApprox. 213.5 lb\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 45.5724%;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 51.5958%;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan\u003eOmniX Smart Control\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eOne of the biggest upgrades to the HS400FDN is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX embedded intelligence\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The heater’s Universal Display provides an intuitive interface while OmniX technology offers enhanced scheduling, temperature management, equipment communication, and advanced system diagnostics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen properly configured with compatible Hayward equipment and connectivity components, the heater can be incorporated into the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHayward OmniX app ecosystem\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for convenient pool and spa management.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eBuilt for Durability\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe standard \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecupro-nickel heat exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e provides increased resistance to corrosion and premature failure caused by challenging pool environments and water chemistry.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHayward’s forced-draft combustion system also helps maintain reliable combustion performance, while Low NOx operation reduces emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cspan\u003eIs the HS400FDN a natural gas heater?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHS400FDN is specifically designed for natural gas.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Customers requiring propane should select the corresponding propane model.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eHow many BTUs is the HS400FDN?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt has a rated input of approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e399,900 BTU\/hr\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, commonly marketed as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e400K BTU heater\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDoes the HS400FDN have OmniX?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. This model features \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX embedded intelligence\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and Hayward’s Universal Display.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCan I control this heater from my phone?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe OmniX platform supports connected\/app-based functionality when the system is properly configured with the required Hayward connectivity and network components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDoes it have a cupro-nickel heat exchanger?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. The HS400FDN includes a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecupro-nickel heat exchanger as standard equipment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhat is the required water flow?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHayward specifies a minimum flow of approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e30 GPM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and a maximum of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e125 GPM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCan this replace an older Hayward H400FDN?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Universal H-Series platform is specifically designed to simplify replacement installations and is compatible with Hayward plumbing adapters. Existing gas, plumbing, electrical, venting, and code requirements should still be verified before installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCan this heater be installed indoors?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIndoor installations require proper venting and must follow Hayward instructions as well as all applicable local building, gas, and electrical codes.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIs professional installation required?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eProfessional installation by a qualified pool-heater or gas technician is strongly recommended. Proper gas sizing, ventilation, water flow, electrical connections, and combustion setup are critical for safe operation and warranty coverage.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":54533034705206,"sku":"HS400FDN","price":5299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/1167\/9798\/files\/HAY-15-0286_medium_63dea772-d7e5-4e12-88da-9eb264c76bd0.jpg?v=1788976080","url":"https:\/\/poolsupplydepot.net\/products\/hayward-universal-h-series-in-ground-natural-gas-heater-with-omnix-400k-hs400fdn","provider":"Pool Supply Depot","version":"1.0","type":"link"}