The TPS Immersion Fired 6201 Series of Fire Tube Low and High Pressure steam boilers (20-125 HP) is well known throughout the industry for its unique small footprint compact two-pass design and dual fuel burner technology. Available in both high pressure (up to 300psi) and low pressure steam, the two pass immersion fire tube design delivers premixed air and gas through multiple burner nozzles. A corresponding “fire tube”, 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 this technology in the TPB Immersion Fired Series fire tube steam boilers include: Natural Efficiency Up to 84% efficiency Two-pass design captures additional flue gas heat after heating primary surface Fuels: natural gas, LP gas, biogas O to 125 psi steam generated within 14 minutes Compact Design Saves Space Utilizes the same single-pass immersion technology Very compact footprint ( smaller sizes 24 sq. ft. up to 42 sq. ft.) 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- Industry’s Best warranty ! Ease of Maintenance Hinged door provides quick access to burners, manifold and heating tubes for easy cleaning and routine maintenance No refractory; thereby reducing annual maintenance and replacement costs Trimmed with non-proprietary components Full inspection of the boiler interior within 15 minutes ! Simplicity of Design No complex controls which require intensive training Fewer moving parts reduces incidence of failure and required retuning Low NOx Emissions Less than 30ppm NOx.