Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) vs Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)
The Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) is the cleaner burner: 1.05 g/hr certified particulate emissions versus 1.1 g/hr. The Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) is the more efficient unit: 80% versus 79% HHV — more heat from every cord. The Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) produces more peak heat (31,581 vs 31,092 BTU/h), suiting roughly 900–1,250 sq ft. The Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) has the larger firebox (1.86 vs 1.32 cu ft), which generally means longer burns between reloads. Combustion technology differs: the Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) is a catalytic stove and the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) a hybrid — see the catalytic vs non-catalytic guide for what that means day to day.
| Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) | Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Catalytic Stove | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.05 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 80 % | 79 % |
| Heat output (low) | 10786 BTU/h | 13876 BTU/h |
| Heat output (high) | 31092 BTU/h | 31581 BTU/h |
| Firebox volume | 1.86 cu ft | 1.32 cu ft |
| Carbon monoxide | 0.57 g/min | 0.52 g/min |
| 25C tax credit eligible (≥75% HHV) | Yes | Yes |
| 2020 NSPS compliant | Yes | Yes |
| Currently in production | Yes | Yes |
| EPA certification number | 110-17 | 210-19 |
| Covered model numbers | 20.2 Series: Ashford 20.2 (AF20.2), Chinook 20.2 (CK20.2), Sirocco 20.2 (SC20.2) | Green Mountain 40 Series: Green Mountain 40 (8640), Craftsbury 2 (8392), Hipster 14 (AMB8240) |
Frequently asked questions
Which burns cleaner, the Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) or the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)?
The Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2): 1.05 g/hr certified particulate emissions versus 1.1 g/hr for the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640).
Are the Blaze King Industries 20.2 Series: Ashford 20.2 (AF20.2) and Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) 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.