The 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.

Key Features

• 500,000 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.

• Patented Cupro-Nickel Finn Plate™ heat exchanger with a heavy-duty bronze header delivers unmatched corrosion resistance and high thermal efficiency.

• Certified for commercial use under ASME standards and includes an ASME pressure relief valve as standard for regulatory compliance and safety.

• Low NOx burner technology offers environmentally friendly operation while maintaining optimal heat output and stable combustion.

• Independent left or right-side electrical, plumbing, and gas connection options simplify installation in tight or complex mechanical spaces.

• Equipped with 2” x 2½” CPVC flanged connections designed for high-flow commercial hydraulics and reduced backpressure.

• Electronic lock-out feature protects system configuration settings from unauthorized adjustment—ideal for public facilities.

• Simplified service access via single front panel, easy gas valve adjustments, and dual-voltage capability with fuse-protected circuit boards.

• Compatible with the Universal ASME H-Series commercial lineup, including 250k, 400k, and 500k BTU natural gas or propane models.

• Optional Texas Heater Kits available for region-specific compliance and installation needs.

Product Overview
The 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.

Technicians 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.