G Class G3
Previously certified
EPA lists G Class G3 under Polar Furnace Manufacturing Inc. as a previously certified hydronic heater.
The listed emission rate is 0.06 pounds per million BTU.
The listed HHV efficiency is 77 percent.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
EPA rows
| Field | Row 1 |
|---|---|
| Status | Previously certified |
| Type | Hydronic Heater |
| Subtype | Non-Catalytic Stove |
| Emission | 0.06 pounds per million BTU |
| HHV efficiency | 77 percent |
| Heat output | 26,235–182,387 BTU/hr |
| Heat output maximum | Not listed |
| Firebox | 12.7 cu ft |
| CO | 3.288 g/min |
| Certified fuel | Cord Wood |
| Test method | Not listed |
| 2020 NSPS | Yes |
| Thermal storage | No |
Retail names in the model line
These are the names split from EPA's model cell. They are aliases for this line, not separate listings.
- G Class G3
Other model lines from this manufacturer
- G-Class G2Plus Currently certified
- G2-G2 Previously certified
- G3-G3 Previously certified
Nearest model lines by EPA figures
Nearest means the smallest absolute difference on that EPA figure, among other Hydronic Heater model lines that list it. Ties are ordered by model name.
Emission
- BioWIN 212 — 0.06 pounds per million BTU
- BioWIN 212 — 0.06 pounds per million BTU
- Central Boiler Classic Edge 960, WoodMaster CleanFire 900 — 0.06 pounds per million BTU
- Crown Royal Stoves 7400E — 0.06 pounds per million BTU
- G Series G7000 — 0.06 pounds per million BTU
HHV efficiency
- Crown Royal Stoves 7200E — 77 percent
- GARN WHS-1000H and WHS1000V — 77 percent
- GARN WHS-1000H, GARN WHS-1000V — 77 percent
- Pellematic 20 — 77 percent
- Pellematic 32 — 77 percent
Heat output
- Maxim M255 PE — 27,846–182,504 BTU/hr
- Woodmaster Ultra 30 — 102,716 BTU/hr maximum
- Woodmaster CleanFire 400 — 102,408 BTU/hr maximum
- Woodmaster Mini Boiler — 101,577 BTU/hr maximum
- PES 25-32 — 99,797 BTU/hr maximum
Polar Furnace Manufacturing Inc. hub · EPA Certified Wood Heater Database