The ML42 boiler is super efficient and can be used for heating new building(s) or be integrated into existing heating systems.  Moreover, the water furnace does not require daily feeding as other outdoor furnaces.   The stoker model has user determined metering controls for fuel.  The user decides and sets how much fuel goes into the stove according to the heat desired / required.

Heating with coal is economical and the available indoor hopper eliminates coal freezing troubles.  Using coal also minimizes the need for expensive fuels such as natural gas, oil and propane.

The ML42 outdoor water furnace has many features, listed below, that are signature to Portage and Main furnaces.

Features:

Double pass with reversing flow tube heat exchange is standard.

Water-filled baffle provides first and second pass of heat exchanger and catches fly ash.

Rounded firepot and water jacket is stronger, longer lasting as well as cleaner and more efficient

Four 3” diameter heat transfer water tubes

Rotating heavy duty self-cleaning high out put cast iron stoker head available in 18” or 20”

Combustion blower induces air through the specially designed slots in the stoker head

Stoker in “Fire Keep Mode” controlled by adjustable time override to come on for 30 seconds every 30 minutes

Last pass through before exiting chimney

Digital Johnson control is programmable to one degree.

High limit safety aquastat, a manual aquastat, can control the furnace if the Johnson control fails

Variable Frequency Drive (VFD) speed control feed rate -   allows for burning of any grade fuel

Adjustable drive overloads for fan and stoker

Burn back protection by parallel wiring to insuring stoker and fan will stop if overload/jam occurs as well as timer device

Heavy-duty Bonfiglioli Gear Box Drive and heavy-duty ¼ HP AC 220 Volt 3-Phase Leeson drive motor (inverter rated)

Automatic 5’ ash remover auger

Fuel feed hopper designed to fit under hopper bottom bin – auger made with 3/8” flighting

Indoor hopper available in custom sizes

Float is easy to read – low water shut-down safety switch on stokers

Fire door insulated with Roxul insulation which is rated for 2200 degrees F and the heat exchanger door is lined with refractory brick

Solid rope gaskets on fire door heat exchanger and cleaning access doors keep the unit air tight

Powder coated finish on the one piece roof, paint on the rest of the furnace

Firepot and inside water jacket are made of 1/4” W44 cold rolled steel.

The outside water jacket is made of 3/16” W44 cold rolled steel.

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

• Portage & Main ML42 Outdoor Water Furnace Manual (Wood-Fired Outdoor Water Furnace Manual)

• Portage & Main ML42 Outdoor Water Furnace Manual (Automatic Stoker & Ash Removal Manual)

• Portage & Main ML42 Outdoor Water Furnace Brochure

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Please call or email for a shipping quote.

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