Earth Manufacturing Klear Sky 400
Earth Manufacturing Klear Sky 400 is a non-catalytic hydronic heater from Earth Manufacturing certified at 5.1 g/hr particulate emissions with 47% 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 | Klear Sky 400 |
| Emission rate | 5.1 g/hr |
|---|
| Efficiency (HHV) | 47 % |
|---|
| Heat output (high) | 70770 BTU/h |
|---|
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | No |
| Currently in production | No |
What space does the Earth Manufacturing Klear Sky 400 suit?
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
Similar hydronic heaters
- Maine Energy Systems Pellematic 20 (0.23 g/hr)
- Fröling Heizkessel und Behälterbau Ges.m.b.H FHG 20/30
- Windhager Zentralheizung Technik GmbH BioWIN 212
- Maine Energy Systems Pellematic 22 (0.44 g/hr)
- Fröling Heizkessel und Behälterbau Ges.m.b.H P4 Unit 20
- Effecta Energy Solutions Komplett III LIGHT 20 KW
Frequently asked questions
Is the Earth Manufacturing Klear Sky 400 EPA certified?
The Earth Manufacturing Klear Sky 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 Earth Manufacturing Klear Sky 400's emission rate?
The Earth Manufacturing Klear Sky 400 is certified at 5.1 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 Earth Manufacturing Klear Sky 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 Earth Manufacturing Klear Sky 400's certified efficiency is 47% 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)