The Hayward H500FDPASME Universal H-Series ASME Heater is a commercial-grade 500,000 BTU propane gas unit engineered for superior heating performance, energy efficiency, and long-term durability. As the highest-capacity model in the Universal H-Series ASME lineup, this heater is specifically designed and certified for demanding commercial pool and spa environments. With industry-leading hydraulics, Low NOx emissions, and premium construction materials—including a Cupro-Nickel Finn Plate™ heat exchanger and bronze header—the H500FDPASME delivers rapid heat-up times and reliable operation. Flexible installation options allow seamless integration into new builds or existing mechanical rooms.

Key Features

• High-capacity 500,000 BTU output delivers extremely fast and efficient heating for large commercial pools, with the ability to pair two units for a combined 1,000,000 BTUs.

• Patented Cupro-Nickel Finn Plate™ heat exchanger with bronze header provides exceptional corrosion resistance and superior thermal efficiency in harsh aquatic environments.

• ASME certified for commercial use and includes an ASME pressure relief valve as standard to meet regulatory and safety requirements.

• Low NOx combustion system ensures environmentally responsible performance without sacrificing heating power or stability.

• Independent left or right-side electrical, water, and propane gas connections simplify installation in complex or space-restricted mechanical rooms.

• 2" x 2½" CPVC flanged connections support high-flow commercial hydraulics with reduced backpressure for improved system efficiency.

• Electronic lock-out feature prevents unauthorized adjustments to system settings, enhancing operational control and security in public facilities.

• Easy serviceability with single front-panel access, straightforward gas valve adjustments, and fuse-protected dual-voltage circuit boards.

• Compatible with all Universal H-Series ASME models (250k, 400k, 500k BTU) in natural gas or propane, offering flexibility for expansion or upgrades.

• Texas Heater Kits available to meet specialized installation standards and regional code requirements.

Product Overview
The Hayward H500FDPASME Universal H-Series ASME Heater is built to handle the heavy demands of commercial aquatic facilities, delivering powerful propane-fired heating with outstanding efficiency and durability. Its advanced Cupro-Nickel Finn Plate™ heat exchanger resists chemical corrosion and scaling, ensuring long service life even in aggressive water conditions. The unit’s high BTU output provides rapid temperature recovery for large pools and spas, while its Low NOx burner technology supports cleaner and more sustainable operation.

The heater’s flexible plumbing and electrical connections make it ideal for retrofit or new-construction installations, and its intuitive service access reduces maintenance time. With commercial certification, robust construction, and high-efficiency performance, the H500FDPASME stands out as a premium heating solution for hotels, resorts, aquatic centers, waterparks, and municipal facilities. Whether used as a single powerhouse unit or paired for 1 million BTUs of output, it delivers the reliability, speed, and energy efficiency required in today’s professional-grade pool heating applications.