Archived List of Cleaner Hydronic Heaters
The Burn Wise Program ran from 2009 to 2025. The website serves as a historic record; EPA is no longer updating program content as of October 30, 2025.
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.
Below are 3 lists of cleaner burning hydronic heaters that qualified for the EPA voluntary program. The first table is for models that qualified for the Phase 1 orange tag for "year round" use (about 70 percent cleaner than unqualified models). Please note that although the tag is calculated for year round use, some jurisdictions may not allow "year round" use (i.e., not during summer for just hot water rather than heat). The second table is for models that qualified for the Phase 1 orange tag for "heating season use only." These emissions are calculated as if the model is only used during the heating season. Please note that some jurisdictions do not allow models that only qualify for "heating season use only" because their emissions would be greater if they are used year round.
The third table is archived Phase 2 models that are no longer manufactured, the expiration date has expired, or no longer meet the current emissions level.
TABLE 1
Phase 1 Orange Tag "Year Round" Models
| Manufacturer | Model Name & Number | Heat Output Rating (1) | Annual Average Emission Rate | Heat Input (2) Annual Average Emission Level | Heat Output Annual Average Emission Level | Highest Individual Test Run |
|---|---|---|---|---|---|---|
| Pro-Fab Industries Inc. | Empyre Pro Series 200 | 66,290 BTU/hr | 8.40 grams/hr 0.18 grams/hr/ | 0.182 lbs/million BTU heat input | 0.27 lbs/million BTU heat output | 18.023 grams/hr |
| Central Boiler | E - Classic 2300 | 160,001 BTU/hr | 6.4 grams/hr 0.06 grams/hr/ | 0.20 lbs/million BTU heat input | 0.31 lbs/million BTU heat output | 17.60 grams/hr |
| Piney Manufacturing Limited (Portage and Main) | Optimizer 250 | 44,519 BTU/hr | 5.33 grams/hr 0.18 grams/hr/ | 0.199 lbs/million BTU heat input | 0.35 lbs/million BTU heat output | 8.31 grams/hr |
| Sequoyah Paradise | E3300B | 109,528 BTU/hr | 8.1 grams/hr 0.13 grams/hr/ | 0.28 lbs/million BTU heat input | 0.56 lbs/million BTU heat output | 19.1 grams/hr |
| Central Boiler | E - Classic 1200 | 89,613 BTU/hr | 7.5 grams/hr 0.15 grams/hr/ | 0.33 lbs/million BTU heat input | 0.59 lbs/million BTU heat output | 19.94 grams/hr |
| Wood Doctor | Converter | 87,858 BTU/hr | 20.3 grams/hr 0.33 grams/hr/ | 0.30 lbs/million BTU heat input | 0.66 lbs/million BTU heat output | 41.5 grams/hr |
| Heatmor | 400 SSR | 157,784 BTU/hr | 31.3 grams/hr 0.29 grams/hr/ | 0.41 lbs/million BTU heat input | 0.68 lbs/million BTU heat output | 47.6 grams/hr |
| Heatmor | 200 SSR | 71,923 BTU/hr | 20.3 grams/hr 0.42 grams/hr/ | 0.35 lbs/million BTU heat input | 0.76 lbs/million BTU heat output | 33.4 grams/hr |
| Bioheat Resources | BH500 Eco Energy | 73,067 BTU/hr | 19.07 grams/hr 0.323 grams/hr/ | 0.402 lbs/million BTU heat input | 0.77 lbs/million BTU heat output | 71.602 grams/hr |
| Hardy | KB175 | 66,681 BTU/hr | 16.3 grams/hr 0.31 grams/hr/ | 0.54 lbs/million BTU heat input | 0.87 lbs/million BTU heat output | 42.7 grams/hr |
| Greenwood Technologies (3) | 100 | 18,248 BTU/hr | 15.205 grams/hr 1.090 grams/hr/ | 0.564 lbs/million BTU heat input | 2.046 lbs/million BTU heat output | 17.80 grams/hr |
| Sequoyah Paradise | E3400 | 101,020 BTU/hr | 21.88 grams/hr 0.42 grams/hr/ | 0.488 lbs/million BTU heat input | 2.37 lbs/million BTU heat output | 34.77 grams/hr |
1 - Based on 8-hour test for stick wood models and 4-hour test for continuous feed models.
2 - EPA Phase 1 level is 0.60 lbs/million BTU. Emission levels are annual averages unless qualified for heating season use only.
3 - These data are via the "cordwood exception," i.e., according to the ASTM cordwood method in lieu of EPA Method 28 OWHH.
TABLE 2
Phase 1 Orange Tag "Heating Season Only" Models
| Manufacturer | Model Name & Number | Heat Output Rating (1) | Heating Season Average Emission Rate | Heat Input (2) Heating Season Average Emission Level | Heat Output Heating Season Average Emission Level | Highest Individual Test Run |
|---|---|---|---|---|---|---|
| Pro-Fab Industries Inc. | Empyre Pro Series 200 | 66,290 BTU/hr | 11.58 grams/hr 0.25 grams/hr/ | 0.186 lbs/million BTU heat input | 0.28 lbs/million BTU heat output | 18.023 grams/hr |
| Piney Manufacturing Limited (Portage and Main) | Optimizer 250 | 44,519 BTU/hr | 6.59 grams/hr 0.21 grams/hr/ | 0.201 lbs/million BTU heat input | 0.32 lbs/million BTU heat output | 8.31 grams/hr |
| Central Boiler | E - Classic 2300 | 160,001 BTU/hr | 8.6 grams/hr 0.08 grams/hr/ | 0.21 lbs/million BTU heat input | 0.32 lbs/million BTU heat output | 17.60 grams/hr |
| Sequoyah Paradise | E3300B | 109,528 BTU/hr | 8.5 grams/hr 0.13 grams/hr/ | 0.20 lbs/million BTU heat input | 0.39 lbs/million BTU heat output | 19.1 grams/hr |
| Central Boiler | E - Classic 1200 | 89,613 BTU/hr | 9.1 grams/hr 0.17 grams/hr/ | 0.31 lbs/million BTU heat input | 0.51 lbs/million BTU heat output | 19.94 grams/hr |
| Wood Doctor | Converter | 87,858 BTU/hr | 26.8 grams/hr 0.43 grams/hr/ | 0.30 lbs/million BTU heat input | 0.65 lbs/million BTU heat output | 41.5 grams/hr |
| Alternative Fuel Boilers | EBW150 | 27,441 BTU/hr | 14.14 grams/hr 0.576 grams/hr/ | 0.434 lbs/million BTU heat input | 0.80 lbs/million BTU heat output | 24.05 grams/hr |
| Bioheat Resources | BH500 Eco Energy | 73,067 BTU/hr | 28.54 grams/hr 0.478 grams/hr/ | 0.479 lbs/million BTU heat input | 0.90 lbs/million BTU heat output | 71.602 grams/hr |
| Aqua-Therm | Omega 100 | 63,807 BTU/hr | 23.80 grams/hr 0.515 grams/hr/ | 0.551 lbs/million BTU heat input | 1.17 lbs/million BTU heat output | 26.988 grams/hr |
| Greenwood Technologies (3) | 100 | 18,248 BTU/hr | 13.643 grams/hr 0.863 grams/hr/ | 0.418 lbs/million BTU heat input | 1.362 lbs/million BTU heat output | 17.80 grams/hr |
| Sequoyah Paradise | E3400 | 101,020 BTU/hr | 20.10 grams/hr 0.31 grams/hr/ | 0.37 lbs/million BTU heat input | 1.48 lbs/million BTU heat output | 34.77 grams/hr |
1 - Based on 8-hour test for stick wood models and 4-hour test for continuous feed models.
2 - EPA Phase 1 level is 0.60 lbs/million BTU. Emission levels are annual averages unless qualified for heating season use only.
3 - These data are via the "cordwood exception," i.e., according to the ASTM cordwood method in lieu of EPA Method 28 OWHH.
TABLE 3
Phase 2 Archived Models
| Manufacturer | Model | Fuel Type | Maximum Heat Output Rating (BTU/hr) | 8-hour Output Rating (BTU/hr) | Annual Average Efficiency (% HHV) | Annual Avg Emission Rate (grams/hr) | Annual Avg Emission Level (lbs/million BTU) |
|---|---|---|---|---|---|---|---|
| Kunzel PK-10 | wood pellets; continuous feed | 45506 | NA | 0.7 | 0.21 | ||
| Kunzel PK-20 | wood pellets; continuous feed | 85969 | NA | 1.2 | 0.13 | ||
| E - Classic 1400 | stick wood; batch load | 209316 | 107459 | NA | 5.5 | 0.27 | |
| E - Classic 2300 | stick wood; batch load | 172343 | 160001 | NA | 6.4 | 0.31 | |
| E-Classic 2400 | stick wood; batch load | 260486 | 186453 | NA | 3.3 | 0.12 | |
| Maxim M250 | wood pellets; continuous feed | 212453 | NA | 1.6 | 0.06 | ||
| KBP 270 | wood pellets; continuous feed | 120000 | NA | 2.96 | 0.20 | ||
| 200 SSR II | stick wood; batch load | 204934 | 66842 | NA | 3.7 | 0.18 | |
| Earth Energy Series 190 | stick wood; batch load | 189093 | 87577 | NA | 3.56 | 0.19 | |
Northland Dist. & Mfg Inc. | Pristine Series 1000 | stick wood; batch load | 82968 | 48721 | NA | 2.5 | 0.24 |
Northwest Manufacturing, Inc. (Woodmaster) | AFS 900 | wood pellets; continuous feed | 107069 | NA | 2.49 | 0.24 | |
Pro-Fab Industries | Empyre Pro Series 200 | stick wood; batch load | 219278 | 66290 | NA | 8.4 | 0.27 |
Pro-Fab Industries | Empyre Pro Series 400 | stick wood; batch load | 209119 | 177333 | NA | 6.1 | 0.31 |
Wood Doctor | WD- HE8000 | stick wood; batch load | 248411 | 112655 | NA | 6.1 | 0.26 |