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Subscribe to BurnWise Breathe Easier with Cleaner Outdoor Wood-Fired Heaters (PDF) (1pg, 451k, About PDF)
Below is the Phase 2 list of cleaner burning hydronic heaters that qualify for EPA's Hydronic Heater program*. Phase 2 units have a white tag and are about 90 percent cleaner than unqualified units. EPA's Phase 1 models are no longer considered "qualified" under the Program after March 31, 2010. Use of permanent labels and hang tags for these models must be discontinued on units manufactured after that date. You can find Phase 1 archived here.
* The wood-burning appliances that are "qualified" under the EPA's Voluntary Hydronic Heater and Fireplace Programs are not "certified" per EPA's Wood Heater New Source Performance Standard. Contact your state or local air quality agency for clarification on the type of wood-burning appliances, if any, that may legally be installed in your area
Please Note Energy efficiency numbers that have been calculated using the current test procedure are generating numbers that do not represent actual efficiencies. As such, we have taken down the efficiency column from this web site. Please bear with us while we review this issue.
| Manufacturer | Model Name & Number | Heat Output Rating (1) | Annual Average Emission Rate | Heat Output (2)Annual Average Emission Level | Highest Individual Test Run | Fuel Type |
|---|---|---|---|---|---|---|
Northwest Manufacturing, Inc. (Woodmaster) |
Flex-Fuel 30 KW indoor/ outdoor |
117,022 BTU/hr | 1.5
|
0.04 |
2.5 grams/hr |
stick wood; batch load |
| Northwest Manufacturing, Inc. (Woodmaster) |
Flex-Fuel 30 KW indoor/ outdoor |
110,167 BTU/hr | 1.3
|
0.04 |
3.5 grams/hr |
wood pellets; continuous feed |
| Northwest Manufacturing, Inc. (Woodmaster) |
Flex-Fuel 60 KW indoor/ outdoor |
219,831 BTU/hr | 2.6
|
0.04 |
6.6 grams/hr |
stick wood; batch load |
| Central Boiler |
Maxim M250 |
212,453 BTU/hr | 1.6
|
0.06 |
4.9 grams/hr |
wood pellets; continuous feed |
| Polar Furnace |
G3 | 142,533 BTU/hr | 1.96 |
0.08 |
5.92 grams/hr |
stick wood; batch load |
| Central Boiler |
E-Classic 3200 |
261,506 BTU/hr | 3.3 |
0.08 |
7.3 grams/hr |
stick wood; batch load |
| Northwest Manufacturing, Inc. (Woodmaster) |
Flex-Fuel 60 KW indoor/ outdoor |
179,458 BTU/hr | 3.3
|
0.11 |
6.6 grams/hr |
wood pellets; continuous feed |
| Central Boiler |
E-Classic 2400 |
186,453 BTU/hr | 3.3
|
0.12 |
5.4 grams/hr |
stick wood; batch load |
| Aqua-Therm |
Kunzel PK-20 |
85,969 BTU/hr | 0.7
|
0.13 |
2.64 grams/hr |
wood pellets; continuous feed |
| Heatmor |
200 SSR II | 66,842 BTU/hr | 3.7
|
0.18 |
11.9 grams/hr |
stick wood; batch load |
| HeatSource1 |
Earth Energy Series 190 |
87,577 BTU/hr | 3.56
|
0.19 |
10.7 grams/hr |
stick wood; batch load |
| Northwest Manufacturing, Inc. (Woodmaster) |
AFS 900 |
107,069 BTU/hr | 2.49
|
0.20 |
7.38 grams/hr |
wood pellets; continuous feed |
| Hardy Manufacturing Company |
KBP 270 |
120,000 BTU/hr | 2.96
|
0.20 |
6.03 grams/hr |
wood pellets; continuous feed |
| Aqua-Therm |
Kunzel PK-10 |
45,506 BTU/hr | 0.7
|
0.21 |
0.89 grams/hr |
wood pellets; continuous feed |
| Piney Manufacturing Limited |
Optimizer 250 |
78,252 BTU/hr | 4.7
|
0.23 |
8.0 grams/hr |
stick wood; batch load |
| Greentech Manufacturing |
RS7400-E | 116,597 BTU/hr | 8.04
|
0.23 |
15.84 grams/hr |
stick wood; batch load |
| Pro-Fab Industries, Inc.
Northland Dist. & Mfg Inc. |
Empyre Elite 100 Pristine Series 1000 |
48,721 BTU/hr | 2.5
|
0.24 |
3.8 grams/hr |
stick wood; batch load |
| Wood Doctor |
WD- HE8000 |
112,655 BTU/hr | 6.1
|
0.26 |
17.4 grams/hr |
stick wood; batch load |
| Steel Tech Inc. (Heatmaster SS) |
G200 | 80,368 BTU/hr | 5.6
|
0.27 |
17.1 grams/hr |
stick wood; batch load |
| Pro-Fab Industries Inc. |
Empyre Pro Series 200 |
66,290 BTU/hr | 8.4
|
0.27 |
18.0 grams/hr |
stick wood; batch load |
| Central Boiler |
E - Classic 1400 |
107,459 BTU/hr | 5.5
|
0.27 |
8.5 grams/hr |
stick wood; batch load |
| Heatmor |
400 4S | 160,599 BTU/hr | 9.9 |
0.28 |
13.97 grams/hr |
stick wood; batch load |
| Hardy Manufacturing Company |
KB165 | 73,573 BTU/hr | 3.9 |
0.31 |
5.37 grams/hr |
stick wood; batch load |
| Hardy Manufacturing Company |
KB220 | 77,135 BTU/hr | 4.5
|
0.31 |
6.7 grams/hr |
stick wood; batch load |
| Central Boiler |
E - Classic 2300 |
160,001 BTU/hr | 6.4
|
0.31 |
17.6 grams/hr |
stick wood; batch load |
| Pro-Fab Industries Inc. |
Empyre Pro Series 400 |
177,333 BTU/hr | 6.1
|
0.31 |
13.6 grams/hr |
stick wood; batch load |
| Wood Doctor |
HE-5000 | 44,502 BTU/hr | 4.2
|
0.32 |
5.4 grams/hr |
stick wood; batch load |
1 - Based on 8-hour test for stick wood models and 4-hour test for continuous feed models.
2 - EPA Phase 2 qualified level is 0.32 pounds of fine particles per million BTU of heat output (weighted average representing the range of burn rates expected in a year) and a maximum individual test run of 18.0 grams per hour. Typically, the maximum individual test run is the maximum heat output burn rate.