Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C vs Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681)
The Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) is the cleaner burner: 0.53 g/hr certified particulate emissions versus 1.3 g/hr. The Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) is the more efficient unit: 80% versus 78% HHV — more heat from every cord. The Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) produces more peak heat (33,424 vs 25,471 BTU/h), suiting roughly 950–1,350 sq ft. The Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C has the larger firebox (3.25 vs 3.16 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C is a catalytic stove and the Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C | Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.3 g/hr | 0.53 g/hr |
| Efficiency (HHV) | 78 % | 80 % |
| Heat output (low) | 11974 BTU/h | 14846 BTU/h |
| Heat output (high) | 25471 BTU/h | 33424 BTU/h |
| Firebox volume | 3.25 cu ft | 3.16 cu ft |
| Carbon monoxide | 1.46 g/min | 0.2 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 212-19 | 390-25 |
| Covered model numbers | Vermont Castings Defiant 1975-CAT-C | Green Mountain 80-1 (Model 8681), Okemo (Model 8380), Hipster 30 (Model 8280) |
Frequently asked questions
Which burns cleaner, the Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C or the Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681)?
The Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681): 0.53 g/hr certified particulate emissions versus 1.3 g/hr for the Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C.
Are the Hearth and Home Technologies Vermont Castings Defiant 1975-CAT-C and Hearthstone Quality Home Heating Products Green Mountain 80-1 (Model 8681) both EPA certified?
Yes — both appear on the U.S. EPA's current list of certified wood heaters, and every figure on this page comes from their certification records.