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Dimensions: 29" W × 28" D × 40" H
Heating Capacity: 399,000 BTU
Fuel Type: Natural Gas
Heat Exchanger: Cupro-Nickel Fin Tube
Header Material: Bronze (ASME)
Ignition Type: Digital Electronic Spark-to-Pilot Ignition
Elevation Rating: 0–2,000 Feet

The Raypak 013731 B-R408-EN-X #50 Professional ASME Digital Natural Gas Pool & Spa Heater is engineered for commercial and high-demand residential applications requiring exceptional durability, dependable heating performance, and ASME-certified construction. Featuring a 399,000 BTU input, a premium cupro-nickel fin tube heat exchanger with .065" tubing walls, heavy-duty bronze headers, and electronic spark-to-pilot ignition, this heater delivers fast, efficient water heating while meeting stringent ASME standards for commercial installations. Designed for elevations from 0 to 2,000 feet above sea level, it is an ideal solution for hotels, apartment complexes, HOAs, aquatic facilities, fitness centers, and demanding residential pool and spa systems.

Built with stainless steel construction throughout and Raypak's rugged, corrosion-resistant cabinet, the B-R408-EN-X #50 is designed to withstand harsh outdoor environments while providing years of dependable service. A factory-installed flow switch and temperature/pressure gauge come pre-wired as standard equipment, and protective wire-harness sheathing shields internal wiring from moisture and abrasion.

Operation is managed through Raypak's microprocessor controls with digital display, paired with a Condensation Defense system and Unitherm governor that prevent internal condensation buildup. The robust, self-adjusting burner design and stainless steel burner tray keep combustion consistent, and the unit is fully compatible with salt-chlorine generator systems.

Key Features

• 399,000 BTU input for fast, reliable heat recovery
• Cupro-nickel fin tube heat exchanger with .065" tubing walls resists corrosion
• Heavy-duty bronze headers rated for ASME commercial service
• Electronic spark-to-pilot ignition for reliable startup
• Microprocessor controls with digital display
• Pre-wired flow switch and T&P gauge included as standard equipment
• Condensation Defense system with Unitherm governor
• Protective wire-harness sheathing for long-term reliability
• Robust, self-adjusting burner design
• Stainless steel burner tray and stainless steel construction
• Salt-chlorine generator compatible
• 82% thermal efficiency

Specifications

What's Included

• Raypak B-R408-EN-X #50 Professional ASME digital natural gas heater
• Pre-wired flow switch and temperature/pressure gauge
• Stainless steel burner tray
• Protective wire-harness sheathing
• Installation and owner's manual

Backed by Raypak's decades of commercial heating expertise, an industry-leading 3-year Professional Series warranty, and a nationwide dealer support network, the B-R408-EN-X #50 is trusted by pool professionals for demanding commercial installations where dependable, code-compliant heating performance is non-negotiable.

Learn more at https://www.raypak.com/products/pool-and-spa/professional-pool-and-spa-heaters/digital-gas-asme-pool-and-spa-heater/