EPA New Source Performance Standards regulate emissions, not efficiency. Most manufacturers responded by building the least expensive boilers they could to meet the new emission standard, without regard to efficiency. These types of boilers have vertical heat exchange tubes only, and are much easier to build.
The PORTAGE & MAIN Optimizer EGR is built to a much higher standard. Like all large commercial boilers the EGR has horizontal and vertical flues for maximum efficiency and longevity. The EGR is the only boiler to have a series of water jacketed horizontal flues in the base of the boiler next to the reaction chamber for maximum contact between the superheated exhaust gases and the heat exchange tubes. When the flue gases leave the reaction chamber they must immediately turned 180 degrees and pass through a series of horizontal flues then turn other 90 degrees to pass through the vertical flues. This design is much more efficient, gives you quicker recovery times and lower stack temperatures which equals less wood and a better return on investment over time.
SO WHY BUY HALF A BOILER WHEN YOU CAN BUY A WHOLE ONE?
PORTAGE & MAIN does not skimp! Because of our double welded joints (exclusive to portage and Main), generous use of refractory in the firebox and water jacketed horizontal flues in the base, PORTAGE & MAIN BOILERS generally weigh 20% to 35% more than our competitors, which makes a better boiler.
PORTAGE & MAIN BOILERS, Setting New Standards for Efficiency, Quality And Longevity!