{"product_id":"hayward-hdf400-dual-fuel-heater","title":"Hayward HDF400 Universal HC Pool \u0026 Spa Heater – 400K BTU Dual-Fuel, Energy-Efficient, Low NOx","description":"\u003cp data-start=\"488\" data-end=\"827\"\u003eThe \u003cstrong data-start=\"492\" data-end=\"541\"\u003eHayward HDF400 Universal HC Pool \u0026amp; Spa Heater\u003c\/strong\u003e delivers \u003cstrong data-start=\"551\" data-end=\"589\"\u003epowerful, energy-efficient heating\u003c\/strong\u003e with a \u003cstrong data-start=\"597\" data-end=\"619\"\u003e400,000 BTU output\u003c\/strong\u003e, making it ideal for large residential pools and spas. Featuring a \u003cstrong data-start=\"687\" data-end=\"707\"\u003edual-fuel design\u003c\/strong\u003e, this heater provides flexible installation options while maintaining \u003cstrong data-start=\"778\" data-end=\"824\"\u003ereliable and consistent water temperatures\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"829\" data-end=\"1162\"\u003eEngineered with \u003cstrong data-start=\"845\" data-end=\"867\"\u003elow NOx technology\u003c\/strong\u003e, the HDF400 meets strict emissions standards without sacrificing performance. Its \u003cstrong data-start=\"950\" data-end=\"979\"\u003ecompact, universal design\u003c\/strong\u003e allows for easy replacement of existing heaters, while the \u003cstrong data-start=\"1039\" data-end=\"1070\"\u003ecupro-nickel heat exchanger\u003c\/strong\u003e ensures superior durability and corrosion resistance—even in demanding pool environments.\u003c\/p\u003e\n\u003ch2 data-start=\"1169\" data-end=\"1191\"\u003e\u003cstrong data-start=\"1172\" data-end=\"1189\"\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003cstrong data-start=\"492\" data-end=\"541\"\u003eHayward HDF400 Universal HC Pool \u0026amp; Spa Heater \u003c\/strong\u003eCompatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-start=\"1192\" data-end=\"1439\"\u003e\n\u003cli data-start=\"1192\" data-end=\"1249\"\u003e\n\u003cp data-start=\"1194\" data-end=\"1249\"\u003eDesigned for \u003cstrong data-start=\"1207\" data-end=\"1247\"\u003ein-ground residential pools and spas\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1250\" data-end=\"1311\"\u003e\n\u003cp data-start=\"1252\" data-end=\"1311\"\u003eCompatible with \u003cstrong data-start=\"1268\" data-end=\"1309\"\u003enatural gas or propane configurations\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1312\" data-end=\"1376\"\u003e\n\u003cp data-start=\"1314\" data-end=\"1376\"\u003eWorks with \u003cstrong data-start=\"1325\" data-end=\"1374\"\u003estandard pool plumbing and electrical systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1377\" data-end=\"1439\"\u003e\n\u003cp data-start=\"1379\" data-end=\"1439\"\u003eIntegrates with \u003cstrong data-start=\"1395\" data-end=\"1437\"\u003eHayward automation and control systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":51030756852029,"sku":"HDF400","price":3899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/6741\/8429\/files\/ProductImage_2.png?v=1763863370","url":"https:\/\/poolsupply4u.com\/products\/hayward-hdf400-dual-fuel-heater","provider":"PoolSupply 4U","version":"1.0","type":"link"}