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Heating Capacity: 332,500 BTU
Fuel Type: Natural Gas
Heat Exchanger: All-Copper Fin Tube
Header Material: Bronze (ASME)
Ignition Type: Digital Electronic Ignition
Elevation Rating: 0–5,000 Feet
Weight: 280 lbs

The Raypak 017707 B-R337A-EN-C #26 Low NOx ASME Digital Natural Gas Pool & Spa Heater is built for high-demand commercial and residential applications, delivering a 332,500 BTU input through an all-copper fin tube heat exchanger and heavy-duty bronze headers engineered to ASME pressure vessel standards. Certified for Low NOx emissions compliance and rated for elevations from 0 to 5,000 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 Raypak's rugged PolyTuf powder-coated galvanized steel cabinet, the B-R337A-EN-C #26 is designed to withstand harsh outdoor environments while providing years of dependable service. The single-piece extruded copper fin tube heat exchanger and porcelainized bronze headers resist corrosion from aggressive water chemistry, while stainless steel tube sheets keep waterways non-ferrous. Raypak's patent-pending ProTek Shield module adds an extra layer of corrosion protection to extend heat exchanger life, and the wind-resistant natural draft design keeps the unit firing reliably even in exposed outdoor installations.

Digital controls with automatic pilot ignition make setup, diagnostics, and daily operation simple, while the built-in Unitherm Governor automatically regulates water flow to keep the heat exchanger above 105°F and minimize condensation damage. The heater is ASME pressure vessel certified and meets ANSI Z21.56 and SCAQMD Rule 1146.2 Low NOx emissions standards for use in strict air-quality regions.

Key Features

• 332,500 BTU input for fast, high-volume heating
• All-copper fin tube heat exchanger with single-piece extruded fins
• ASME-certified bronze headers with porcelainized waterways
• Digital controls with automatic pilot ignition
• ProTek Shield corrosion protection module
• Unitherm Governor condensation protection
• Low NOx combustion certified to SCAQMD Rule 1146.2
• Stainless steel burners and non-ferrous tube sheets
• Automatic bypass built into the header
• PolyTuf powder-coated galvanized steel cabinet
• Wind-resistant natural draft design, no fans required
• Rated for elevations 0-5,000 feet
• Supports water flow rates up to 125 GPM
• Suitable for indoor or outdoor installation

Specifications

What's Included

• Raypak 017707 B-R337A-EN-C #26 pool & spa heater
• Pre-installed digital control panel
• Integrated header bypass assembly
• Owner's manual and installation guide
• Manufacturer warranty documentation

Backed by Raypak's decades of commercial heating expertise and a nationwide network of authorized service dealers, the 017707 is trusted by pool professionals for reliable, code-compliant performance in demanding commercial environments.

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