SPW Immersion Fired Series

The SPW Immersion Fired Series of water heaters (formerly known as the "BT Series" sold under the Sellers Engineering brand) is well known throughout the industry for its unique single-pass design and burner technology. The single pass immersion firetube design delivers premixed air and gas through multiple burner nozzles. A corresponding flue tube (“firetube”), completely immersed in liquid, is aligned with the nozzle head inside the combustion chamber. Upon combustion, the nozzles generate a focused, high velocity flame which radiates down the center of each tube. The benefits of the technology in the SPW Immersion Fired Series water heaters includes:

 Efficiency

• Up to 83% efficiency
• Radiant heat is maximized across the primary heating surface

 Low Maintenance Cost and High Longevity

• Elimination of thermal shock due to balanced heat transfer across primary heating surface; allowing for up to 150° F ΔT
• Backed by a 20-year non-prorated thermal shock warranty
• Elimination of refractory breakdown due to single pass design (no refractory material is used)

 Ease of Maintenance

• Hinged door provides quick access to burners, manifold and heating tubes for easy cleaning and routine maintenance
• Trimmed with non-proprietary components

 Simplicity of Design

• No complex controls which require intensive training
• Fewer moving parts reduces incidence of failure and required retuning

 Low NO_x and CO Emissions

• Less than 30ppm NOx
• Less than 50ppm CO

_{Engineering data from the previous website can be found at: http://www.sellersengineering.com/engdata.asp . CAD drawing and design templates from the previous website can be found at: http://www.sellersengineering.com/producttemp.asp}