Raypak ASME B-R406A-EN-X #51 399k BTU Natural Gas Cupronickel Pool Heater

Raypak B-R406A-EN-X #51 399,000 BTU Natural Gas Cupronickel Heater

The Raypak B-R406A-EN-X #51 is a 399,000 BTU natural gas pool and spa heater engineered for powerful heating performance in moderate elevation environments. Designed for large residential and light commercial pools, this model delivers rapid heat-up and consistent temperature control.

Featuring a cupronickel fin tube heat exchanger, this heater offers superior resistance to corrosion and chemical wear, making it ideal for saltwater pools and challenging water conditions. Its Professional Series construction ensures long-term reliability in outdoor installations.

High Elevation Performance with Maximum Heating Capacity

The #51 configuration is designed for elevations between approximately 2,000 and 5,999 feet, ensuring efficient combustion and stable performance. The digital control panel allows for precise temperature adjustments, while the electronic ignition system ensures dependable startup.

The cupronickel heat exchanger provides extended durability and consistent heating performance, even in aggressive pool environments.

Key Features

• 399,000 BTU heating capacity for large pools and spas
• #51 configuration for moderate elevation operation
• Natural gas powered heater
• Cupronickel heat exchanger for corrosion resistance
• Professional Series construction for long-term durability
• Digital control panel with precise temperature adjustment
• Electronic ignition system with no standing pilot
• Approximately 82% thermal efficiency
• Wind-resistant cabinet for outdoor installations
• Ideal for high-demand pool systems

About the Raypak ASME Series

Raypak ASME Series pool heaters are engineered for commercial-grade performance and long-term reliability in high-demand pool and spa applications. Constructed in accordance with ASME standards, these heaters feature heavier-duty components and thicker heat exchangers designed to withstand continuous operation and higher system pressures. Available in both copper and cupronickel configurations, the ASME Series offers flexibility for standard and saltwater pool environments, with cupronickel models providing enhanced resistance to corrosion and chemical wear. The natural gas configuration delivers consistent, cost-effective heating, while Raypak’s proven atmospheric burner design ensures stable outdoor performance. With precise digital controls, electronic ignition, and fast heat-up capability, the ASME Series provides dependable, high-output heating for commercial and large residential pool systems across a range of elevations.