Raypak B-R408-EN-X #50 Professional ASME Natural Gas Heater, 399K BTU, 2" Bronze Headers, Cupro-Nickel Exchanger, 0-2000 ft Elevation, 013731

The Raypak B-R408-EN-X is the Professional Series ASME natural gas pool heater with a cupro-nickel heat exchanger, 2 inch headers and electronic digital control, configured for installations between 0 and 2000 ft elevation. It uses the #50 burner.

Built for commercial pools

Raypak aims the Professional Series at apartments, condos, hotels, motels, schools, parks and community pools, along with high end private pools. The ASME rating is the reason: many jurisdictions require an ASME coded heater on a public or commercial pool.

Cupro-nickel and coastal duty

The exchanger uses cupro-nickel tubing rather than plain copper. That is the difference that keeps the heater alive on water that runs out of balance, and Raypak calls out this series specifically for coastal sites where salt air shortens the life of ordinary equipment.

Check the rating and the elevation

The listing gives 399,000 BTU while the model number reads 408 and one catalog entry states 408K BTU. Confirm against the data plate when sizing. The unit is configured for 0 to 2000 ft; higher elevation sites need the matching high altitude build. A liquid propane version with the #57 burner is a separate model.