Hearthstone Quality Home Heating Products Green Mountain 80 8680
Hearthstone Quality Home Heating Products Green Mountain 80 8680 is a hybrid (catalytic + secondary burn) wood stove from Hearthstone Quality Home Heating Products certified at 0.67 g/hr particulate emissions with 81% HHV efficiency and a 15,069–33,396 BTU/h output range.
| Appliance type | wood-stove |
|---|---|
| Combustion technology | Hybrid |
| Certified fuel | Crib Wood |
| Covered model numbers | Green Mountain 80 8680 |
| Emission rate | 0.67 g/hr |
|---|---|
| Carbon monoxide | 0.23 g/min |
| Efficiency (HHV) | 81 % |
|---|
| Heat output (low) | 15069 BTU/h |
|---|---|
| Heat output (high) | 33396 BTU/h |
| Firebox volume | 3.16 cu ft |
| 25C tax credit eligible (≥75% HHV) | Yes |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 162-18 |
What space does the Hearthstone Quality Home Heating Products Green Mountain 80 8680 suit?
- Its 33,396 BTU/h peak output covers roughly 950–1,350 sq ft at the 25–35 BTU/h-per-square-foot rule of thumb — see the sizing calculator to adjust for your insulation and climate.
- The 3.16 cu ft firebox puts it in the large-home, overnight-burn class.
- Rough fuel use: about 1.6 cords per season at the midpoint of its output range (8 burn-hours/day, 150-day season, 22 MMBtu/cord — see methodology).
- Certified burning Crib Wood .
Compare the Hearthstone Quality Home Heating Products Green Mountain 80 8680
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Similar wood stoves
- Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) (0.53 g/hr)
- United States Stove Company US1261E (1.9 g/hr)
- Hearthstone Quality Home Heating Products Green Mountain 60 8660 (0.6 g/hr)
- FPI/Regency Fireplace Products Alterra Pro I3000 Series (I300R (0.95 g/hr)
- United States Stove Company US1800E (1.8 g/hr)
- Hearthstone Quality Home Heating Products Manchester 8362 (0.65 g/hr)
Frequently asked questions
Is the Hearthstone Quality Home Heating Products Green Mountain 80 8680 EPA certified?
Yes, the Hearthstone Quality Home Heating Products Green Mountain 80 8680 is on the EPA's current list of certified wood heaters (certification number 162-18) and meets the 2020 NSPS Step 2 emission limits.
What is the Hearthstone Quality Home Heating Products Green Mountain 80 8680's emission rate?
The Hearthstone Quality Home Heating Products Green Mountain 80 8680 is certified at 0.67 grams of particulates per hour (tested with crib wood). Real-world emissions depend heavily on fuel moisture and operation — the lab figure assumes seasoned fuel and correct air settings.
How many square feet can the Hearthstone Quality Home Heating Products Green Mountain 80 8680 heat?
Roughly 950–1,350 sq ft, estimated from its 33,396 BTU/h peak output at 25–35 BTU/h per square foot. Insulation, climate, ceiling height, and floor plan move this figure substantially in both directions.
Does the Hearthstone Quality Home Heating Products Green Mountain 80 8680 qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The Hearthstone Quality Home Heating Products Green Mountain 80 8680's certified efficiency is 81% HHV, which met the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
Sources
- cfpub.epa.gov (retrieved 2026-07-23)