Northwest Manufacturing Woodmaster CleanFire 400
Northwest Manufacturing Woodmaster CleanFire 400 is a non-catalytic hydronic heater from Northwest Manufacturing certified at 1.04 g/hr particulate emissions with 67% HHV efficiency (previously certified, no longer in production).
Previously certified (out of production). This model appears in the EPA Certified Wood Heater Database but is no longer on the current certified list, which usually means it is no longer manufactured. The specifications below are its certified figures, kept for reference and for owners of installed units. Browse currently certified heaters for models sold new today.
| Appliance type | hydronic-heater |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Cord Wood |
| Covered model numbers | Woodmaster CleanFire 400 |
| Emission rate | 1.04 g/hr |
|---|
| Efficiency (HHV) | 67 % |
|---|
| Heat output (high) | 102408 BTU/h |
|---|
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | No |
What space does the Northwest Manufacturing Woodmaster CleanFire 400 suit?
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
Similar hydronic heaters
- Northwest Manufacturing Woodmaster Ultra 30 (1.6 g/hr)
- Northwest Manufacturing Woodmaster Mini Boiler (1.4 g/hr)
- HeatMaster Furnaces G Series G4000 (0 g/hr)
- Heatmaster Furnaces Inc. (SteelTech Inc.) G Series G4000
- Maine Energy Systems PES 25-32 (0.8 g/hr)
- Fröling Heizkessel und Behälterbau Ges.m.b.H S3 Turbo 30
Frequently asked questions
Is the Northwest Manufacturing Woodmaster CleanFire 400 EPA certified?
The Northwest Manufacturing Woodmaster CleanFire 400 holds EPA certification number n/a but is no longer on the current certified list — it is previously certified, which usually means the model is out of production. Already-installed units are unaffected by that status in most jurisdictions.
What is the Northwest Manufacturing Woodmaster CleanFire 400's emission rate?
The Northwest Manufacturing Woodmaster CleanFire 400 is certified at 1.04 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 Northwest Manufacturing Woodmaster CleanFire 400 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 Northwest Manufacturing Woodmaster CleanFire 400's certified efficiency is 67% HHV, which did not meet 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)