Ultimizer Wood
BL2534
- Output
- 200,000 BTU/hr
- Coverage
- up to 4,000 sq ft
- Firebox
- 25 × 34 in
- Fuel
- Cordwood
Outdoor wood, coal, and stoker boilers, hand-built in Prince Albert, Saskatchewan. Robotic welders, laser-cut steel, and a design that lasts thirty years — with every part replaceable.
From the compact BL2534 for residential loads to the ML42 industrial flagship at over a million BTU per hour — every model shares the same heat-exchanger geometry, the same hand welds, the same replaceable parts.
Our oldest unit still in continuous use was installed in 1995 and has heated every winter since. Robotic welds, laser-cut firebox plate, and forced air-jacket cooling on every joint — we engineer for decades, not seasons.
Doors, gaskets, refractory, heat exchanger, grates — every component is a service part you can swap in the field. If a competitor’s firebox cracks, you buy a new boiler. If ours wears, you order a panel.
Our gasification models meet EPA Phase 2 emissions and burn 30–50% less wood than legacy outdoor stoves. Customers report 12–14 hour burn cycles on a single load — and 90 gallons of propane backup in a year instead of 800.
Every fire on earth needs three things in balance: oxygen, fuel, and heat. Most outdoor boilers starve one leg to make the others easier — and you pay the price in smoke, creosote, and wasted cord. The Ultimizer engineers all three. That’s why it burns cleaner, longer, and on less wood than the boiler it replaces.
A boiler is not a sealed appliance. It’s a workshop you keep running.
Every door, gasket, refractory brick, heat exchanger panel, fire grate, and ash pan in a Portage & Main boiler is a service part. We stock them. Our dealers stock them. You can rebuild a 1995 ML30 today with parts off the shelf — and we’ve done it.
That’s the difference between an outdoor boiler and a disposable furnace. You don’t replace it. You maintain it.
Browse the parts catalogThis unit has been in continuous use every winter since 1995 and has functioned flawlessly and very efficiently. Thirty years on and still going.David Fountain · ML30 owner · since 1995
Twelve to fourteen hours between loads — wow. Cut my wood by a third.Dylan · BL3444, Manitoba
Ninety gallons of propane in a year. My neighbor used eight hundred.Troy Dahlgren · BL2840, Northern BC
Tell us about your space and we’ll point you to the right model — or hand you off to a local dealer who can quote installation. No salesy follow-up. Just an honest read on what fits.