{"product_id":"hayward-h500fdnasme-universal-h-series-asme-500-000-btu-natural-gas-low-nox","title":"Hayward  500,000 BTU - Natural Gas, Low NOx, Universal H-Series ASME","description":"\u003cp data-start=\"112\" data-end=\"891\"\u003eThe Hayward H500FDNASME Universal H-Series ASME Heater is a high-capacity 500,000 BTU natural gas unit designed and certified specifically for commercial aquatic facilities. As the flagship of the Universal H-Series commercial lineup, this heater delivers powerful, energy-efficient performance, industry-leading hydraulics, and exceptional durability. Engineered with a patented Cupro-Nickel Finn Plate™ heat exchanger and bronze header, the H500FDNASME offers superior resistance to corrosion and extreme water conditions. With Low NOx emissions, flexible installation options, and a rugged commercial-grade design, it is ideal for resorts, aquatic centers, fitness clubs, hotels, and large commercial pool applications requiring rapid and reliable heating.\u003c\/p\u003e\n\u003chr data-start=\"893\" data-end=\"896\"\u003e\n\u003cp data-start=\"898\" data-end=\"916\"\u003e\u003cstrong data-start=\"898\" data-end=\"914\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"917\" data-end=\"2288\"\u003e\n\u003cli data-start=\"917\" data-end=\"1082\"\u003e\n\u003cp data-start=\"919\" data-end=\"1082\"\u003e500,000 BTU output provides extremely fast heating performance, with the option of combining two units to achieve 1,000,000 BTUs in minimal equipment room space.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1083\" data-end=\"1236\"\u003e\n\u003cp data-start=\"1085\" data-end=\"1236\"\u003ePatented Cupro-Nickel Finn Plate™ heat exchanger with a heavy-duty bronze header delivers unmatched corrosion resistance and high thermal efficiency.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1237\" data-end=\"1383\"\u003e\n\u003cp data-start=\"1239\" data-end=\"1383\"\u003eCertified for commercial use under ASME standards and includes an ASME pressure relief valve as standard for regulatory compliance and safety.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1384\" data-end=\"1516\"\u003e\n\u003cp data-start=\"1386\" data-end=\"1516\"\u003eLow NOx burner technology offers environmentally friendly operation while maintaining optimal heat output and stable combustion.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1517\" data-end=\"1661\"\u003e\n\u003cp data-start=\"1519\" data-end=\"1661\"\u003eIndependent left or right-side electrical, plumbing, and gas connection options simplify installation in tight or complex mechanical spaces.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1662\" data-end=\"1784\"\u003e\n\u003cp data-start=\"1664\" data-end=\"1784\"\u003eEquipped with 2” x 2½” CPVC flanged connections designed for high-flow commercial hydraulics and reduced backpressure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1785\" data-end=\"1913\"\u003e\n\u003cp data-start=\"1787\" data-end=\"1913\"\u003eElectronic lock-out feature protects system configuration settings from unauthorized adjustment—ideal for public facilities.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1914\" data-end=\"2059\"\u003e\n\u003cp data-start=\"1916\" data-end=\"2059\"\u003eSimplified service access via single front panel, easy gas valve adjustments, and dual-voltage capability with fuse-protected circuit boards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2060\" data-end=\"2192\"\u003e\n\u003cp data-start=\"2062\" data-end=\"2192\"\u003eCompatible with the Universal ASME H-Series commercial lineup, including 250k, 400k, and 500k BTU natural gas or propane models.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2193\" data-end=\"2288\"\u003e\n\u003cp data-start=\"2195\" data-end=\"2288\"\u003eOptional Texas Heater Kits available for region-specific compliance and installation needs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2290\" data-end=\"2293\"\u003e\n\u003cp data-start=\"2295\" data-end=\"2845\"\u003e\u003cstrong data-start=\"2295\" data-end=\"2315\"\u003eProduct Overview\u003c\/strong\u003e\u003cbr data-start=\"2315\" data-end=\"2318\"\u003eThe Hayward H500FDNASME Universal H-Series ASME Heater is engineered to meet the heating demands of large commercial pools and spas, providing rapid heat-up capability with its powerful 500,000 BTU output. Its robust construction—featuring a Cupro-Nickel Finn Plate™ heat exchanger and bronze header—ensures long-term durability against scale, erosion, and chemically harsh environments commonly found in commercial systems. The heater’s Low NOx design supports cleaner, more sustainable operation without compromising power.\u003c\/p\u003e\n\u003cp data-start=\"2847\" data-end=\"3486\"\u003eTechnicians and facility managers benefit from straightforward installation thanks to flexible connection points, high-flow CPVC flanges, and front-panel access for all major components. Dual-voltage compatibility and protected circuit boards further enhance serviceability and safety. Whether used in a resort, waterpark, athletic center, hotel, or municipal facility, the H500FDNASME delivers outstanding performance, reliability, and energy efficiency. As part of Hayward’s commercial ASME lineup, it stands as a top-tier heating solution built to handle heavy workloads and deliver consistent temperature control season after season.\u003c\/p\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":51354333937976,"sku":"H500FDNASME","price":5399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/6319\/9544\/files\/IMG_1582_clipped_02_Commercial_Heater_copy_292d.webp?v=1777923571","url":"https:\/\/appaetechpoolsupply.com\/products\/hayward-h500fdnasme-universal-h-series-asme-500-000-btu-natural-gas-low-nox","provider":"AppaeTech Pool Supply","version":"1.0","type":"link"}