Forge & Flame Discovery III wood stove

Forge & Flame Discovery III Wood Stove

Wood Stove · Featuring Quadra-Fire Technology

Forge & Flame Discovery III

Heritage: Quadra-Fire

The biggest Discovery, for long burns and big rooms.

Heating Capacity1,550–3,100 sq ft
Efficiency80% (certified rating)
Viewing Area165 sq in
Maximum Log Size18″
Burn TimeApprox. 8–12 hours
FuelWood
ControlsAutomatic air control that closes itself after the fire is going
FanOptional

Figures per the manufacturer. Real-world results depend on your home, fuel, and install.

Not every dealer carries every model. We'll show you what's available near you, the local dealers who can help, and a free Project Guide you can take to any dealer.

See the Discovery III on the manufacturer's site: forgenflame.com/products/quadra-fire-discovery-iii-wood-stove ↗

On This Page

  1. Who It's For
  2. What Makes It Special
  3. Possible Downsides
  4. Manuals and Documents
  5. Frequently Asked Questions

Who It's For

In a larger home, a midsize stove runs flat out and still loses the battle with the far rooms. You need the bigger firebox. The Forge & Flame Discovery III, featuring Quadra-Fire burn technology, is for the large living space where wood is the main heat and the owner still wants to choose the look. Too small a stove means constant reloading; this one carries the evening and the night.

What Makes It Special

Its firebox takes logs up to 18 inches and can burn up to 12 hours on a load.

Automatic Combustion Control lets in extra air at startup and closes on its own after about 20 minutes, so the fire settles into a long, efficient burn without you.

The sides take any 12 by 12 inch ceramic tile, or use the solid side panel. A wood bin is built into the pedestal, and the cast iron door has satin nickel hinge pins.

Possible Downsides

If you heat a large space with wood and want a stove that looks like yours, the Forge & Flame Discovery III is the right decision. You add a log at bedtime and the coals are still glowing at sunrise.

Add the 160 cfm fan kit or an outside air kit.

Manuals and Documents

Documents open on the manufacturer's website. Your installer follows the manual for your exact install.

Frequently Asked Questions

How large a space can the Forge & Flame Discovery III heat?

The Forge & Flame Discovery III, featuring Quadra-Fire burn technology, heats about 1,550–3,100 square feet. It's the biggest stove in the Discovery series, built for a large living space where wood is the main heat. For a smaller room, the Discovery I is the better size.

How long does a load of wood last in the Discovery III?

Expect about 8–12 hours per load. Its 2.26 cubic foot firebox takes logs up to 18 inches long, so you can add a log at bedtime and still find glowing coals at sunrise.

What is Automatic Combustion Control on the Discovery III?

It's a timed start-up air system. You push the activation knob back and pull it forward, and the ACC timer holds the start-up air inlet open for about 20 minutes before closing on its own. A separate burn rate control sets the airflow for your comfort level after that.

How efficient and clean is the Discovery III?

It carries an 80% certified efficiency rating and is certified to the 2020 EPA wood heater standard at 1.6 grams per hour. Quadra-Fire's Four-Point Burn System burns the fire in stages, including a final zone above the baffle, before exhaust leaves the chimney.

Can I customize how the Discovery III looks?

Yes. Each side holds three nominal 12 by 12 inch noncombustible tiles, sized 11-11/16 to 11-7/8 inches square and no more than 5/16 inch thick, or you can repaint the solid side panels with 300°F high-temp paint. A wood storage bin is built into the pedestal, and the cast iron door has satin nickel hinge pins.

Does the Discovery III come with a blower?

No, the blower is a separate 160 CFM fan kit that helps spread warmth through the room. The only other listed add-on is an ACC outside air kit.

Is the Discovery III approved for mobile homes and alcoves?

Yes to both. A mobile home install needs the OAK-ACC outside air kit, a #8 copper ground wire to the frame, listed double-wall connector pipe with a spark arrestor, and no sleeping-room placement. In an alcove, you must use 6-inch double-wall connector pipe, and the alcove can be no more than 48 inches deep.

What size hearth pad does the Discovery III need?

In the US, the non-combustible floor protector must extend at least 16 inches in front of the glass and 8 inches to each side of the loading door, and the brochure lists a 31-5/8 by 41 inch minimum. Canada requires 18 inches in front.

The Quadra-Fire Story

Quadra-Fire was founded by Alan Trusler and Dan Henry as Aladdin Steel Products near Colville, Washington, in 1978–79. Its Quad-Burn system, introduced in 1986, burns wood smoke in four zones without a catalytic combustor. HON Industries (now HNI) bought the company in 1998, and since 2023 Quadra-Fire stoves have been sold under the Forge & Flame name, with the original model names.

Read the full Quadra-Fire story →

Find a Local Dealer for Your Fireplace Project

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Not every dealer carries every model. We'll show you what's available near you, the local dealers who can help, and a free Project Guide you can take to any dealer.

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Forge & Flame and Quadra-Fire are trademarks of Hearth & Home Technologies. Find My Fireplace is independent and not affiliated with or endorsed by Forge & Flame or Hearth & Home Technologies. Product details are drawn from the manufacturer's published brochures and manuals; our evaluations are our own.

Product images may be computer renderings; confirm finishes and options before purchase.