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.
General
Appliance type
hydronic-heater
Combustion technology
Non-Catalytic Stove
Certified fuel
Cord Wood
Covered model numbers
G-Class G2Plus
Emissions
Emission rate
1.34 g/hr
Carbon monoxide
1.7 g/min
Efficiency
Efficiency (HHV)
81 %
Heat output
Heat output (low)
34835 BTU/h
Heat output (high)
183307 BTU/h
Firebox volume
9.27 cu ft
Certification
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.
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.
