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List of Qualified Hydronic Heaters

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EPA's Phase 2 qualified level for hydronic heaters is 0.32 pounds of fine particles per million BTU of heat with a maximum individual test run of 18.0 grams per hour.  You can find Phase 1 and Phase 2 models archived here.

A new column has been added titled “Annual Average Efficiency (percent, higher heating value)”.  This efficiency is the thermal efficiency (also termed delivered efficiency) of the model as calculated in EPA’s Method 28 WHH, page 33, www.epa.gov/burnwise/pdfs/owhhphase2agreement.pdf.  This efficiency represents the effectiveness of a hydronic heater to deliver the energy contained in a load of wood into the circulating water that heats your home.  Hydronic heater thermal efficiencies typically range from 40% - 85%.  Thermal efficiency and combustion efficiency are not the same.  Combustion efficiency only tells you how much of the wood has burned and has no relationship to how much heat is transferred to your home. 

Note about the use of higher heating value (HHV) and lower heating value (LHV) of wood when calculating the delivered efficiency.  HHV is the measure of the energy content of a fuel that is most commonly used in North America (8600 Btu/lb).  In Europe, the LHV is most commonly used (7988 BTU/lb).  If the LHV is used, the efficiency rating of a hydronic heater would be higher than if the HHV is used.  The difference is about 8 percentage points.  For example, a hydronic heater which has an efficiency rating of 78% based on the LHV would have an efficiency rating close to 70% based on HHV.

“NA” in the efficiency column indicates the model was tested using EPA’s previous Method and is not available. 

Contact your state or local air quality agency for clarification on the type of wood-burning appliances that may legally be installed in your area.

Phase 2 Qualified White Tag Models*
Manufacturer Model Fuel Type Max 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)
Woodmaster
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Flex-Fuel
30 KW indoor/
outdoor
stick wood;
batch load
117022   NA 1.5 0.04
Woodmaster
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Flex-Fuel
30 KW indoor/
outdoor
wood pellets;
continuous feed
110167   NA 1.3 0.04
Woodmaster
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Flex-Fuel
60 KW indoor/
outdoor
stick wood;
batch load
219831   NA 2.6 0.04
Heatmor
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200 SSP wood pellets;
continuous feed
162793   69 1.1 0.07
SteelTech
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G100 stick wood;
batch load
110963   68 1.0 0.07
Polar Furnace
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G3 stick wood;
batch load
200645 142533 72 1.96 0.08
Central Boiler
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E-Classic
3200
stick wood;
batch load
305777 261506 NA 3.3 0.08
Central Boiler
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E-Classic
2400
stick wood;
batch load
260486 186453 NA 3.3 0.12
Aqua-Therm
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Kunzel
PK-20
wood pellets;
continuous feed
85969   NA 1.2 0.13
Hawken Energy
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GX-10 stick wood;
batch load
144870 76887 64 2.2 0.14
LEI Products
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MBB-100 wood pellets;
continuous feed
91300   NA 1.99 0.15
Woodmaster
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Flex-Fuel
60 KW indoor/
outdoor
wood pellets;
continuous feed
179458   NA 2.3 0.16
Central Boiler
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E-Classic 1450 stick wood;
batch load
214271 120529 78 4.7 0.18
Heatmor
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200 SSR II stick wood;
batch load
204934 66842 NA 3.7 0.18
Mahoning Outdoor Furnace
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Sky Series V stick wood;
batch load
101420 82594 54 2.44 0.18
HeatSource1
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Earth
Energy
Series
190
stick wood;
batch load
189093 87577 NA 3.56 0.19
Polar Furnace
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G2 stick wood;
batch load
182073 66897 67 3.53 0.19
Piney
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Enviro Chip 500 wood chips;
continuous
280000   73 5.4 0.19
Webiomass Woodpecker wood pellets;
continuous feed
153000   72 3.3 0.19
Aqua-Therm
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Kunzel
PK-10
wood pellets;
continuous feed
45506   NA 0.7 0.21
Nature's Comfort
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GT-6000 stick wood;
batch load
266711 100959 73 5.7 0.22
Piney
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Optimizer
250
stick wood;
batch load
178112 78252 NA 4.7 0.23
Greentech
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RS7400-E stick wood;
batch load
296192 116597 61 8.04 0.23
Steel Tech
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G400 stick wood;
batch load
335010 180409 74 9.0 0.23

Pro-Fab Industries
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Empyre Elite 100

Empyre Elite XT100

stick wood;
batch load
82968 48721 NA 2.5 0.24
Wood Boiler
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E4 stick wood;
batch load
161455 77308 61 4.5 0.25
Marway Welding
Phase 2-200 stick wood;
batch load
139576 65336 39 3.75 0.26
Steel Tech
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G200 stick wood;
batch load
295285 80368 NA 5.6 0.27
Pro-Fab Industries
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Empyre
Pro
Series
200
stick wood;
batch load
219278 66290 NA 8.4 0.27
Central Boiler
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E - Classic
1400
stick wood;
batch load
209316 107459 NA 5.5 0.27
Heatmor
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400 4S stick wood;
batch load
376409 160599 76 10.7 0.28
Earth
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Klear Sky 400 stick wood;
batch load
70770 45786 47 5.1 0.29
Piney
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Optimizer 350 stick wood;
batch load
231719 160421 65 7.3 0.30
Hardy
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KB125 stick wood;
batch load
119457 60261 61 4.09 0.30
Hardy
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KB165 stick wood;
batch load
139629 73573 57 3.9 0.31
Hardy
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KB220 stick wood;
batch load
139845 77135 NA 4.5 0.31
Pro-Fab Industries
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Empyre Elite 200

Empyre Elite XT 200

stick wood;
batch load
185983 64047 61 5.96 0.31
Pro-Fab Industries
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Empyre
Pro
Series
400
stick wood;
batch load
209119 177333 NA 6.1 0.31
Wood Doctor
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HE-5000 stick wood;
batch load
135094 44502 NA 4.2 0.32

 

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