Polar Furnace Manufacturing G-Class G2Plus
Polar Furnace Manufacturing G-Class G2Plus is a non-catalytic hydronic heater from Polar Furnace Manufacturing certified at 1.34 g/hr particulate emissions with 81% HHV efficiency and a 34,835–183,307 BTU/h output range.
| Appliance type | hydronic-heater |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Cord Wood |
| Covered model numbers | G-Class G2Plus |
| Emission rate | 1.34 g/hr |
|---|---|
| Carbon monoxide | 1.7 g/min |
| Efficiency (HHV) | 81 % |
|---|
| Heat output (low) | 34835 BTU/h |
|---|---|
| Heat output (high) | 183307 BTU/h |
| Firebox volume | 9.27 cu ft |
| 25C tax credit eligible (≥75% HHV) | Yes |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 10HH-16 |
What space does the Polar Furnace Manufacturing G-Class G2Plus suit?
- The 9.27 cu ft firebox puts it in the large-home, overnight-burn class.
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
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Frequently asked questions
Is the Polar Furnace Manufacturing G-Class G2Plus EPA certified?
Yes, the Polar Furnace Manufacturing G-Class G2Plus is on the EPA's current list of certified wood heaters (certification number 10HH-16) and meets the 2020 NSPS Step 2 emission limits.
What is the Polar Furnace Manufacturing G-Class G2Plus's emission rate?
The Polar Furnace Manufacturing G-Class G2Plus is certified at 1.34 grams of particulates per hour (tested with cord wood). Real-world emissions depend heavily on fuel moisture and operation — the lab figure assumes seasoned fuel and correct air settings.
Does the Polar Furnace Manufacturing G-Class G2Plus 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 Polar Furnace Manufacturing G-Class G2Plus'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)