Hearthstone Green Mountain 40 Wood Stove

Green Mountain 40

Model 8640



TruHybrid™ Combustion System:
Clean burning, uber-efficient, burn times up to 16 hours**.

Single Lever Air Control:
Easy operation, consistent performance

Easy Catalyst Control Handle:
Open side lever for smokeless startups, close for long, efficient fires

Durable Construction:
Full cast iron construction with 1¼” soapstone lining offers lasting heat and a lifetime of trouble free service.

Large Front Door Glass:
The giant window warms your home with heat and the flickering light of the fire.


Matte black finish swatchMatte Black



BTU: Up to 40,000
Efficiency: 79%
EPA Certified: 1.07 g/hr
Finish: Matte Black
Firebox Capacity: 1.32 cu ft
Flue Exit Diameter: 6
Flue Exit Location: Top
HeatLife: 20 Hours of heat
Heats up to: 1,400 sq ft
Maximum Log Length: 16″
Stove Type: Green Mountain Wood Stove
Weight: 464 lbs


Convection Blower: 96-57400
Outside Air Adapter: 96-53400


  • Side: 14″
  • Rear: 15 1⁄2″
  • Corner: 7″
    Single-wall connector pipe, no rear heat shield
  • Side: 14″
  • Rear: 13 1⁄2″
  • Corner: 7″
    Single-wall connector pipe with included rear heat shield
  • Side: 14″
  • Rear: 9 3⁄4″
  • Corner: 7″
    Double-wall connector pipe with blower kit heat shield


Green Mountain 40 Owners Manual