The Hayward H400FDPASME Universal H-Series ASME Heater is a 400,000 BTU commercial-grade propane gas unit engineered for superior performance, durability, and energy efficiency in demanding aquatic environments. Certified for commercial use, this Low NOx heater combines industry-leading hydraulics, advanced construction materials, and reliable operation to deliver fast, consistent heating for pools and spas. Featuring a Cupro-Nickel Finn Plate™ heat exchanger with a bronze header and flexible plumbing and electrical connections, the H-Series ASME heater is ideal for both new installations and equipment room retrofits.

Key Features

• Patented Cupro-Nickel Finn Plate™ heat exchanger with a heavy-duty bronze header provides exceptional corrosion resistance and long-lasting thermal performance.

• Low NOx burner system supports environmentally friendly operation while delivering rapid and efficient heat-up times for commercial pools.

• ASME certified with a factory-installed ASME pressure relief valve, ensuring compliance with commercial safety and regulatory standards.

• Independent left or right-side connections for electrical, water, and gas lines simplify installation and maximize mechanical room flexibility.

• Equipped with large 2" x 2½" CPVC flanged connections designed to accommodate high-flow commercial hydraulics with minimal resistance.

• Electronic lock-out protects configuration settings from unauthorized access, improving operational security in public and managed facilities.

• Simplified service with single front-panel access, easy gas valve adjustment, and fuse-protected circuit boards that support dual-voltage conversion.

• Compatible with additional H-Series commercial models in 250k, 400k, and 500k BTU propane or natural gas configurations.

• Optional Texas Heater Kits available for regional compliance in specialized markets.

• Commercial-grade construction ensures dependable, high-performance heating that stands up to heavy use and harsh water conditions.

Product Overview
The Hayward H400FDPASME Universal H-Series ASME Heater delivers powerful, reliable heating performance for commercial pools, spas, hotels, aquatic centers, and high-end facilities using propane gas. Engineered around a robust Cupro-Nickel Finn Plate™ heat exchanger, the unit provides superior resistance to corrosion and chemical wear—making it ideal for demanding commercial water conditions. Its flexible plumbing and gas connection options allow seamless integration into existing equipment rooms, while the Low NOx burner minimizes environmental impact without compromising heat output.

Service and maintenance are simplified through front-panel access, intuitive adjustments, and protected electronics, giving technicians a user-friendly platform that minimizes downtime. With its strong BTU output and advanced hydraulics, the H400FDPASME provides efficient, fast heating for large-volume applications. Built for long-term reliability, safety, and energy efficiency, it stands as a top choice for facilities seeking a proven, commercial-grade propane heater with premium construction and performance.