{"product_id":"hayward-universal-h-series-low-nox-400000-btu-natural-gas-swimming-pool-heater","title":"Hayward Universal H Series Low NOx 400,000 BTU Natural Gas Swimming Pool Heater","description":"\u003cp\u003e## Hayward Universal H-Series 400,000 BTU Natural Gas Pool Heater\u003c\/p\u003e\n\u003cp\u003eThe world-class thermal engineering with an Earth-friendly conscience, delivering an industry-leading **83% to 84% thermal efficiency**. Engineered with a massive 400,000 BTU output, this premium natural gas unit provides rapid speed-to-heat capabilities—capable of raising the temperature of an 800-gallon spa or plunge pool by 30°F in less than an hour. \u003c\/p\u003e\n\u003cp\u003eIts advanced low-NOx combustion design fully complies with the strictest North American air quality emission standards, making it the premier, eco-conscious heating anchor for high-end residential and commercial inground pool systems.\u003c\/p\u003e\n\u003cp\u003e### Elite Architecture \u0026amp; Saltwater Resilience\u003cbr\u003e*   **Premium Cupro-Nickel Heat Exchanger:** Factory-equipped with a robust cupro-nickel Finn Plate heat exchanger that delivers elite-tier corrosion resistance and erosion protection. It is highly resilient against aggressive water chemistry, making it fully optimized for modern salt-chlorinated pool environments.\u003cbr\u003e*   **Weatherproof Forced Draft System:** Utilizes a heavy-duty combustion blower to constantly drive precise airflow through the insulated Fire Tile chamber. This completely eliminates outside environmental variables like high winds, eliminating the costly requirement of installing a separate high-wind stack.\u003cbr\u003e*   **Advanced Control \u0026amp; Reliability:** Features an intuitive LED digital control pad that continuously monitors system performance metrics. Paired with a hot-surface electronic ignition system, it ensures reliable single-touch lighting.\u003cbr\u003e*   **Universal Equipment Pad Flex:** The \"universal-fit\" flexible cabinet geometry simplifies installation, allowing for direct, hassle-free retrofitting alongside existing plumbing arrays and water chemistry control loops.\u003c\/p\u003e\n\u003cp\u003e### Technical Specifications\u003cbr\u003e*   **Product Code \/ SKU:** W3H400FDN *(Direct upgraded drop-in replacement for legacy model: H400FDN)*\u003cbr\u003e*   **Thermal Rating:** 400,000 BTUs\/hr\u003cbr\u003e*   **Fuel Source:** Natural Gas (NG)\u003cbr\u003e*   **Heat Exchanger Material:** Commercial-Grade Cupro-Nickel (Saltwater Optimized)\u003cbr\u003e*   **Operational Altitude Rating:** Certified up to 10,000 Feet\u003cbr\u003e*   **Plumbing Interface:** 2-Inch Male Threaded Connections\u003cbr\u003e*   **Venting Flexibilities:** Fully certified for both Vertical and Horizontal forced vent configurations\u003cbr\u003e*   **Electrical Multi-Tap:** 120V \/ 240V Single-Phase Adaptable Field Wiring\u003cbr\u003e*   **Cabinet Physical Dimensions:** 33\" Width x 39\" Height x 30\" Depth\u003c\/p\u003e\n\u003cp\u003e---\u003c\/p\u003e\n\u003cp\u003e### ⚠️ Critical Compatibility \u0026amp; Strict Factory Warranty Guidelines\u003cbr\u003e*   **Soft-Sided Pool Incompatibility Warning:** This commercial-capacity heating system **IS NOT compatible with soft-sided, vinyl-bladder, or pop-up above-ground pools** (including Intex, Coleman, or Bestway systems) due to insufficient hydraulic flow rates. Installing this equipment on any soft-sided pool infrastructure **instantly voids the product warranty**.\u003cbr\u003e*   **Water Chemistry Framework:** Structural exchanger failure resulting from unbalanced pH, high saturation indices, or localized corrosive chemical spikes is explicitly excluded from standard factory coverages.\u003cbr\u003e*   **Warranty Terms:** Backed by a 1-Year Manufacturer’s Limited Warranty covering factory replacement parts only. **IMPORTANT:** This factory warranty becomes strictly **void** if the mechanical gas line piping, electrical high-voltage configuration, and water plumbing loop are not completed and signed off by a **certified, licensed pool technician or professional gas fitter**.\u003c\/p\u003e\n\u003cp\u003e---\u003c\/p\u003e\n\u003cp\u003e\u0026gt; 📞 **Gas Infrastructure \u0026amp; Logistics Coordination Inquiry:** \u003cbr\u003e\u0026gt; Deploying a 400,000 BTU natural gas heater requires verifying your property's gas meter capacity, line water velocity (GPM), and onsite line pressure schedules. \u003cbr\u003e\u0026gt; \u003cbr\u003e\u0026gt; Please contact our specialized equipment support team directly to confirm real-time stock availability, heavy freight liftgate delivery arrangements, or to consult on the technical accessories required for your equipment pad layout.\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":59744612384849,"sku":null,"price":5219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1053\/1186\/2865\/files\/H400FD_500x_6e16f496-abff-4fb8-a6ce-f266ff4d4daf.webp?v=1783205967","url":"https:\/\/poolbees.com\/products\/hayward-universal-h-series-low-nox-400000-btu-natural-gas-swimming-pool-heater","provider":"PoolBees Inc.","version":"1.0","type":"link"}