Jump to main content.

List of Cleaner OWHH

Look for the orange hang tag! Below is a list of cleaner burning outdoor wood-fired hydronic heaters.  As indicated by the information in the orange column, these models meet the EPA voluntary program Phase 1 emissions level (EPA Phase 1 level) because they emit no more than 0.60 pounds (lbs) of particulate matter (particle pollution) per million BTUs of heat input (i.e., wood burned).  This information was generated by an accredited third party laboratory.  When purchasing a wood heater, look to see if the orange EPA OWHH tag (PDF) (1pg, 55k) appears on the unit.  The orange tag indicates that the model pollutes less than other models.  Models may qualify for "Year Round" use and/or "Heating Season Only" use.  

Please Note that some States and/or local jurisdictions do not allow models that only qualify for "Heating Season Only" use.  Also, please note that all data below are according to EPA Method 28 OWHH unless otherwise noted.  One manufacturer has asked to use the "cordwood exception" to use the ASTM cordwood test method in lieu of the EPA method.  Labels based on the "cordwood exception" expire 12/31/08.

Outdoor Wood-fired Hydronic Heater Model Information
"Year Round" Label

Manufacturer Model Name & Number 8-hr Heat Output Rating Annual Average Emission Rates Heat Input *
Annual Average Emission Level		 Heat Output Annual Average Emission Level Highest Individual Test Run
Greenwood Technologies Aspen 175 66,290 BTU/hr

8.40 grams/hr

0.18 grams/hr/10,000 BTU heat output

 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/10,000 BTU heat output

 0.20 lbs/million BTU heat input

0.31 lbs/million BTU heat output

 17.60 grams/hr
Central Boiler E - Classic 1200 89,613 BTU/hr

7.5 grams/hr

0.15 grams/hr/10,000 BTU heat output

 0.33 lbs/million BTU heat input

0.59 lbs/million BTU heat output

 19.94 grams/hr
Heatmor 200 SSR 71,923 BTU/hr

20.3 grams/hr

0.42 grams/hr/10,000 BTU heat output

 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

28.54 grams/hr

0.478 grams/hr/10,000 BTU heat output

 0.479 lbs/million BTU heat input

0.77 lbs/million BTU heat output

 71.602 grams/hr
Sequoyah Paradise E3400 101,020 BTU/hr

21.88 grams/hr

0.42 grams/hr/10,000 BTU heat output

 0.488 lbs/million BTU heat input

2.37 lbs/million BTU heat output

 34.77 grams/hr
Hardy KB175 66,681 BTU/hr

16.3 grams/hr

0.31 grams/hr/10,000 BTU heat output

 0.54 lbs/million BTU heat input

0.87 lbs/million BTU heat output

 42.7 grams/hr
Greenwood Technologies ** 100 18,248 BTU/hr

15.205 grams/hr

1.090 grams/hr/10,000 BTU heat output

 0.564 lbs/million BTU heat input

2.046 lbs/million BTU heat output

 17.80 grams/hr

* EPA Phase 1 level is 0.60 lbs/million BTU.  Emission levels are annual averages unless qualified for heating season use only.
** These data are via the "cordwood exception," i.e., according to the ASTM cordwood method in lieu of EPA Method 28 OWHH.

 

Outdoor Wood-fired Hydronic Heater Model Information
"Heating Season Only" Label

Manufacturer Model Name & Number 8-hr Heat Output Rating Heating Season Average Emission Rates Heat Input *
Heating Season Average Emission Level		 Heat Output
Heating Season Average Emission Level		 Highest Individual Test Run
Greenwood Technologies Aspen 175 66,290 BTU/hr

11.58 grams/hr

0.25 grams/hr/10,000 BTU heat output

 0.186 lbs/million BTU heat input

0.28 lbs/million BTU heat output

 18.023 grams/hr
Central Boiler E - Classic 2300 160,001 BTU/hr

8.6 grams/hr

0.08 grams/hr/10,000 BTU heat output

 0.21 lbs/million BTU heat input

0.32 lbs/million BTU heat output

 17.60 grams/hr
Central Boiler E - Classic 1200 89,613 BTU/hr

9.1 grams/hr

0.17 grams/hr/10,000 BTU heat output

 0.31 lbs/million BTU heat input

0.51 lbs/million BTU heat output

 19.94 grams/hr
Sequoyah Paradise E3400 101,020 BTU/hr

20.10 grams/hr

0.31 grams/hr/10,000 BTU heat output

 0.37 lbs/million BTU heat input

1.48 lbs/million BTU heat output

 34.77 grams/hr
Greenwood Technologies ** 100 18,248 BTU/hr

13.643 grams/hr

0.863 grams/hr/10,000 BTU heat output

 0.418 lbs/million BTU heat input

1.362 lbs/million BTU heat output

 17.80 grams/hr
Alternative Fuel Boilers EBW150 27,441 BTU/hr

14.14 grams/hr

0.576 grams/hr/10,000 BTU heat output

 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/10,000 BTU heat output

 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/10,000 BTU heat output

 0.551 lbs/million BTU heat input

1.17 lbs/million BTU heat output

 26.988 grams/hr

* EPA Phase 1 level is 0.60 lbs/million BTU.  Emission levels are annual averages unless qualified for heating season use only.
** These data are via the "cordwood exception," i.e., according to the ASTM cordwood method in lieu of EPA Method 28 OWHH.

 

Local Navigation

Jump to main content.