{"product_id":"hayward-w3h400fdn-universal-h-series-natural-gas-400-000-btu-low-nox","title":"Hayward W3H400FDN Universal H-Series Natural Gas 400,000 BTU Low NOx","description":"\u003ch2\u003e\u003cstrong\u003eHayward W3H400FDN Universal H-Series Natural Gas Pool Heater – 400,000 BTU Low NOx\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Hayward Universal H-Series W3H400FDN is the highest-capacity heater in the H-Series lineup, delivering 400,000 BTU of heating power for large residential pools and high-demand spa systems. Designed for rapid heat-up performance, this natural gas heater allows pool owners to reach desired temperatures quickly while maintaining efficient operation.\u003c\/p\u003e\n\u003cp\u003eThe heater features a corrosion-resistant Cupro-Nickel heat exchanger and advanced hydraulic design that improves durability and protects against erosion from high water flow rates. Its Low NOx emissions design meets strict environmental standards while maintaining strong heating performance. :contentReference[oaicite:2]{index=2}\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eMaximum Heating Power for Large Pools\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Universal H-Series heater combines fan-assisted combustion with a digital LED control panel for accurate temperature control and system diagnostics. Flexible plumbing and gas connections allow easy installation on both new and existing equipment pads.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e400,000 BTU natural gas heating capacity\u003c\/li\u003e\n\u003cli\u003eUniversal H-Series Low NOx emissions heater\u003c\/li\u003e\n\u003cli\u003eCupro-Nickel heat exchanger for superior corrosion resistance\u003c\/li\u003e\n\u003cli\u003eFan-assisted combustion system for consistent heating\u003c\/li\u003e\n\u003cli\u003eElectronic ignition with LED diagnostic controls\u003c\/li\u003e\n\u003cli\u003ePolymer header protects against high-flow erosion\u003c\/li\u003e\n\u003cli\u003e2 in x 2.5 in CPVC union plumbing connections\u003c\/li\u003e\n\u003cli\u003eDesigned for large residential in-ground pools and spas\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":52111417606418,"sku":"W3H400FDN","price":5099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/HPPW3H400FDN_5.jpg?v=1773369243","url":"https:\/\/www.aquaterrabackyard.com\/products\/hayward-w3h400fdn-universal-h-series-natural-gas-400-000-btu-low-nox","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}