Hearthstone Quality Home Heating Products Clydesdale 8492 vs Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)
The Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) is the cleaner burner: 1.1 g/hr certified particulate emissions versus 1.16 g/hr. They tie on efficiency at 79% HHV. The Hearthstone Quality Home Heating Products Clydesdale 8492 produces more peak heat (32,588 vs 31,581 BTU/h), suiting roughly 950–1,300 sq ft. The Hearthstone Quality Home Heating Products Clydesdale 8492 has the larger firebox (2.35 vs 1.32 cu ft), which generally means longer burns between reloads.
| Hearthstone Quality Home Heating Products Clydesdale 8492 | Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640) | |
|---|---|---|
| Appliance type | wood-stove | wood-stove |
| Combustion technology | Hybrid | Hybrid |
| Certified fuel | Crib Wood | Crib Wood |
| Emission rate | 1.16 g/hr | 1.1 g/hr |
| Efficiency (HHV) | 79 % | 79 % |
| Heat output (low) | 14829 BTU/h | 13876 BTU/h |
| Heat output (high) | 32588 BTU/h | 31581 BTU/h |
| Firebox volume | 2.35 cu ft | 1.32 cu ft |
| Carbon monoxide | 1.1 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 | 305-22 | 210-19 |
| Covered model numbers | Clydesdale 8492 | Green Mountain 40 Series: Green Mountain 40 (8640), Craftsbury 2 (8392), Hipster 14 (AMB8240) |
Frequently asked questions
Which burns cleaner, the Hearthstone Quality Home Heating Products Clydesdale 8492 or the Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640)?
The Hearthstone Quality Home Heating Products Green Mountain 40 Series: Green Mountain 40 (8640): 1.1 g/hr certified particulate emissions versus 1.16 g/hr for the Hearthstone Quality Home Heating Products Clydesdale 8492.
Are the Hearthstone Quality Home Heating Products Clydesdale 8492 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.