{"product_id":"hayward-universal-h-series-in-ground-natural-gas-heater-with-omnix-400k-asme-hs400fdnasme","title":"Hayward Universal H-Series In-Ground Natural Gas Heater with OmniX 400K ASME | HS400FDNASME","description":"\u003ch2\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHayward Universal H-Series In-Ground Natural Gas Heater with OmniX 400K ASME | HS400FDNASME\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a high-performance commercial pool and spa heater designed for demanding aquatic environments that require powerful heating, durable construction, and modern equipment control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDelivering approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e400,000 BTU of heating capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the HS400FDNASME is ideal for commercial swimming pools, spas, hotels, resorts, apartment communities, recreation centers, schools, fitness facilities, and other applications requiring dependable year-round heating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis model features \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eASME construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making it specifically suited for commercial installations where ASME-rated equipment may be required by project specifications or local codes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HS400FDNASME combines Hayward's proven Universal H-Series heater platform with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX embedded intelligence\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and the Hayward Universal Display. This provides improved programming, equipment diagnostics, system information, and compatibility with supported Hayward automation platforms.\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 demanding water conditions, while Hayward's Low NOx combustion system provides efficient operation with reduced emissions.\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 commercial pool and spa heater\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNatural gas configuration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003eASME commercial-grade construction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eIntegrated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX intelligence\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 equipment diagnostics\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEnhanced programming capabilities\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCupro-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 system\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for commercial pool and spa applications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFront-access service design\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEfficient hydraulic performance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompatible with supported Hayward automation systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIdeal for new installations and commercial heater replacements\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eProduct Specifications\u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHayward\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eSeries\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUniversal H-Series\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHS400FDNASME\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCommercial Pool \u0026amp; Spa Heater\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eFuel Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNatural Gas\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eHeating Capacity\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 400,000 BTU\/hr\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eListed Input\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e399,900 BTU\/hr\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eConstruction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eASME\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eThermal Efficiency\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e84%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eHeat Exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCupro-Nickel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eMinimum Water Flow\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 30 GPM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Water Flow\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 125 GPM\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eGas Connection\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3\/4\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eControl System\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOmniX \/ Universal Display\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eIgnition Type\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eElectronic \/ Hot Surface\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eApplication\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCommercial In-Ground Pools \u0026amp; Spas\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003eEmission Standard\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLow NOx\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan\u003eCommercial ASME Construction\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe main difference between the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHS400FDNASME\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and a standard residential Universal H-Series heater is its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eASME-rated commercial construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eASME heaters are designed for installations where commercial-duty equipment is required or specified. This makes the HS400FDNASME an excellent option for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHotels and resorts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCommercial swimming pools\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eApartment and condominium communities\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRecreation centers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSchools and universities\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFitness clubs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHealth facilities\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMunicipal aquatic centers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCommercial spas\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways confirm local mechanical, plumbing, gas, and building codes before installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eOmniX Smart Control\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHayward's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOmniX embedded intelligence\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e adds modern control and diagnostic capabilities directly to the heater.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Universal Display provides access to temperature settings, operating information, programming, and system diagnostics from an easy-to-use interface.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen incorporated into a compatible Hayward automation system, the heater can also become part of a centralized pool equipment control platform.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCupro-Nickel Heat Exchanger\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HS400FDNASME uses a durable \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecupro-nickel heat exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making it well suited for demanding commercial environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCupro-nickel provides increased resistance to corrosion compared with traditional copper-only heat exchangers and is commonly preferred in commercial installations where equipment may operate for longer periods or experience more demanding water conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProper water chemistry must still be maintained to protect the heater and maximize equipment life.\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 HS400FDNASME a natural gas heater?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHS400FDNASME is designed for natural gas\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eHow many BTUs is this heater?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis model is commonly rated as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e400,000 BTU heater\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with approximately 399,900 BTU\/hr input.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhat does ASME mean?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eASME refers to construction designed to meet applicable standards established by the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmerican Society of Mechanical Engineers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. ASME-rated heaters are commonly used in commercial pool and spa applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eIs this heater intended for commercial pools?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. The HS400FDNASME is specifically designed for demanding commercial swimming pool and spa applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDoes it include OmniX?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eYes. This model features \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHayward OmniX embedded intelligence\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and the Hayward Universal Display.\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 HS400FDNASME uses a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecupro-nickel heat exchanger\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for improved durability and corrosion resistance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhat is the recommended water flow?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe heater is designed to operate within an approximate water-flow range of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e30 to 125 GPM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, depending on the installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCan this replace an older H400FDNASME?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HS400FDNASME is part of Hayward's updated Universal H-Series platform and is a logical replacement option for many older H400FDNASME installations. Existing plumbing, gas supply, electrical, venting, and installation requirements should be verified before replacement.\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 is strongly recommended. A qualified pool heater or gas technician should verify gas sizing, ventilation, electrical connections, water flow, and all applicable local codes before operation.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":54533043257654,"sku":"HS400FDNASME","price":5449.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/1167\/9798\/files\/HAY-15-0287_medium_abda0dc4-0988-4fdd-b6f9-9de0a5711059.jpg?v=1788988157","url":"https:\/\/poolsupplydepot.net\/products\/hayward-universal-h-series-in-ground-natural-gas-heater-with-omnix-400k-asme-hs400fdnasme","provider":"Pool Supply Depot","version":"1.0","type":"link"}