Highly efficient combustion is achieved in the Optimizer 250 by using the wood gasification process. Wood is burned in the furnace’s primary burn chamber and the gases and exhaust are forced into the lower secondary combustion/reaction chamber where gases burned reach temperatures of 2000°F plus. 

Refractory brick lining of both burn chambers help produce then absorb the high temperatures generated.  Maximum heat extraction is then obtained by passing the exhausting air through vertical and horizontal passes heating the water in the surrounding water jacket quickly and efficiently.

The Optimzer 250 boiler/furnace unit has many features, listed below, that are signature to Portage and Main’s highly efficient, long lasting furnaces.

Features:

The Optimizer 250, as all Portage and Main models, has a rounded firepot with Over Under Air.  Air is injected above, over, the fire from air injection ports running the length of the firepot.  Air also rolls down the sides of the firepot going under the fire providing a clean turbo burn.

Large amounts of pre-cast, stainless steel reinforced refractory brick line the fire chamber; the base measures four inches thick and the sides are nine inches high.  

Common refractory brick is used in the reaction chamber, where gasification occurs, and can be removed, replaced or rearranged.

Heat from the gasification process in the lower reaction area is transferred behind the refractory brick into the water jacket.

The extensive surface area supplied by the scotch marine multi-pass tube heat exchanger provides heat recovery into water.  The heat exchanger of the Optimizer 250 consists of six 2” vertical tubes (first pass) and 20 full length 1.5” horizontal tubes (second and third passes).

Cleaning fire tubes is a breeze, straight through with a cleaning brush, because of total open access from both ends.

Large pump install area is easy to access in the back of the boiler and interior space is protected by insulated doors which are lockable.  Double pump hook up is a feature of the Optimizer 250.  (Pumps are not included with the boiler.)

Also protected by the back doors are the furnace temperature controls (Johnson Control and aquastats), the motorized 120 volt gasketed flapper air shut off, and adjustable primary and secondary air motor fan switch and electrical control box. 

The Optimizer’s digital Johnson Control allows the operator to regulate furnace heat output to the accuracy of one degree and the high limit safety aquastat controls ensure no temperature creeping to boiling point.

Doors are insulated, charge door with Roxull insulation, or double stainless steel and have adjustable latches and hinges.  The safety latch doors seals with top quality industrial core gasket for a long-lasting positive seal.  The furnace itself is well insulated with insulation that is R20 quality.

Convenient Float makes it easy to see the water level.

Powder coated finish is on the one piece roof and other furnace surfaces are painted.

Firepot and heat exchanger are made of 1/4” W44 cold rolled steel.

Inside water jacket is made of 1/4” cold rolled steel and the outside water jacket is made of 3/16” cold rolled steel.

All Parts are laser cut and are boiler style welded – welding inside and outside helps prevent weld corrosion.

• Portage & Main Optimizer 250 Furnace - Discontinued Manual

• Portage & Main Optimizer 250 Furnace - Discontinued Peak Performance Document

• Portage & Main Optimizer 250 Furnace - Discontinued Brochure

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