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WOOD STOVE COMPARISON PAGE

Sorted By: HEATING EFFICIENCY

Sweepy

The new EPA approved woodstoves are not only kinder to the environment, they offer a bonus: since the secondary burn that cleans up the emissions also creates a great deal of free heat, EPA approved woodstoves will heat the same area as their non-approved ancestors while burning much less wood. This translates into heating efficiencies that are nearly double the industry standard of just a few years ago.

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Model
Viewing
Window
Stove
Dimensions
Shipping
Weight
Firebox
Size
Hardwood
Capacity
Max. Log
Length
Heating
Efficiency
EPA
Emissions
Maximum
Output
Average
Output
Heating
Capacity
Hearthstone
Tula

Plate Steel
15"t
12"w
180 sq.in.
41-3/4" T
19-7/8" W
17-3/8" D
325
lbs
1.15
cubic ft
23
lbs
17"
88%
2.5
grams/hr
30,000
btu
20,329
btu/hr
400 - 1200
sq ft
Hearthstone
Homestead
Soapstone
10-5/8"t
17"w
172 sq.in.
27-1/2" T
27" W
19" D
440
lbs
2
cubic ft
40
lbs
21"
83.5%
1.9
grams/hr
50,000
btu
33,547
btu/hr
1200 - 1800
sq ft
Hearthstone
Tribute
Soapstone
8-1/2"t
12"w
102 sq.in.
25-1/2" T
22" W
18" D
338
lbs
1.2
cubic ft
24
lbs
16"
83%
3.0
grams/hr
36,000
btu
20,008
btu/hr
400 - 1200
sq ft
Pacific
Super 27
Plate Steel
8-1/2"t
15"w
128 sq.in.
29-1/8" T
24" W
25" D
390
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Pacific
Super Step Top
Plate Steel
8-1/2"t
15"w
128 sq.in.
33" T
24" W
25" D
390
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Pacific
Spectrum
Plate Steel
8-1/2"t
15"w
128 sq.in.
29-1/8" T
24" W
25" D
390
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Pacific
Alderlea T5
Plate / Cast
9-1/4"t
16"w
148 sq.in.
29-11/16" T
25" W
25" D
515
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Pacific
Classic
Plate Steel
8-1/2"t
15"w
128 sq.in.
29-1/8" T
24" W
25" D
390
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Pacific
Fusion
Plate Steel
8-1/2"t
15"w
128 sq.in.
36-1/4" T
22-1/8" W
26-3/4" D
390
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1200 - 2000
sq ft
Hearthstone
Manchester
Cast/Soapstone
11-1/2"t
18"w
200 sq.in.
32-1/4" T
30-1/4" W
20" D
550
lbs
2.9
cubic ft
59
lbs
24"
81.8%
3.0
grams/hr
78,000
btu
47,654
btu/hr
1800 - 2400
sq ft
 
Pacific
Neo 1.6
Plate Steel
9-1/2"t
15-1/2"w
147 sq.in.
36" T
27-1/8" W
17-7/16" D
300
lbs
1.6
cubic ft
32
lbs
18"
81.3%
3.9
grams/hr
70,000
btu
26,129
btu/hr
700 - 1500
sq ft
Hearthstone
Heritage
Soapstone
10-1/4"t
17"w
174 sq.in.
27" T
27-1/2" W
19" D
500
lbs
2.3
cubic ft
46
lbs
21"
81%
2.7
grams/hr
55,000
btu
37,424
btu/hr
1300 - 1900
sq ft
Hearthstone
Craftsbury

Cast Iron
9"t
13-1/4"w
120 sq.in.
26-1/8" T
22-3/8" W
17-3/8" D
300
lbs
1.5
cubic ft
30
lbs
17"
81%
3.0
grams/hr
40,000
btu
24,407
btu/hr
600 - 1400
sq ft
 
Pacific
Neo 2.5
Plate Steel
10-3/4"t
17"w
182 sq.in.
40" T
29-1/4" W
22" D
450
lbs
2.5
cubic ft
50
lbs
19"
81%
3.9
grams/hr
85,000
btu
40,678
btu/hr
1500 - 2300
sq ft
Pacific
Vista
Plate Steel
8"t
13-1/4"w
106 sq.in.
27-3/4" T
24" W
17-1/2" D
300
lbs
1.41
cubic ft
28.2
lbs
18"
80.7%
2.9
grams/hr
56,000
btu
22,858
btu/hr
600 - 1400
sq ft
Pacific
Alderlea T4
Plate / Cast
9-1/4"t
15"w
139 sq.in.
28" T
26" W
17-1/2" D
450
lbs
1.41
cubic ft
28.2
lbs
18"
80.7%
2.9
grams/hr
56,000
btu
22,858
btu/hr
600 - 1400
sq ft
Pacific
Vista Classic
Plate Steel
8"t
13-1/4"w
106 sq.in.
27-3/4" T
24-7/8" W
17-1/2" D
300
lbs
1.41
cubic ft
28.2
lbs
18"
80.7%
2.9
grams/hr
56,000
btu
22,858
btu/hr
600 - 1400
sq ft
Pacific
Summit
Plate Steel
9"t
17"w
153 sq.in.
31-1/2" T
25-1/2" W
23-1/2" D
475
lbs
3
cubic ft
60
lbs
20"
80.4%
3.9
grams/hr
99,000
btu
48,392
btu/hr
2000 - 3000
sq ft
Summit
Classic
Plate Steel
9"t
17"w
153 sq.in.
29-1/4" T
25-1/2" W
23-1/2" D
475
lbs
3
cubic ft
60
lbs
20"
80.4%
3.9
grams/hr
99,000
btu
48,392
btu/hr
2000 - 3000
sq ft
Pacific
Alderlea T6
Plate / Cast
10"t
18-1/2"w
185 sq.in.
29-1/8" T
29-1/4" W
25" D
585
lbs
3
cubic ft
60
lbs
20"
80.4%
3.9
grams/hr
99,000
btu
48,392
btu/hr
2000 - 3000
sq ft
Hearthstone
Castleton

Soapstone
9-1/2"t
15-1/3"w
146 sq.in.
27-1/2" T
25-1/2" W
20" D
540
lbs
1.9
cubic ft
38
lbs
18"
80%
2.71
grams/hr
45,000
btu
30,535
btu/hr
800 - 1500
sq ft
Hearthstone
Lima
Plate Steel
15"t
12"w
180 sq.in.
44" T
19-1/2"
Diameter
440
lbs
1.25
cubic ft
25
lbs
17"
80%
3.57
grams/hr
35,000
btu
20,088
btu/hr
400 - 1200
sq ft
Hearthstone
Shelburne
Cast Iron
10-1/2"t
16-3/4"w
176 sq.in.
29" T
26" W
21" D
425
lbs
2
cubic ft
40
lbs
20"
80%
2.1
grams/hr
50,000
btu
32,141
btu/hr
1200 - 1800
sq ft
Hearthstone
Bari

Plate / Soapstone
15"t
12"w
180 sq.in.
44" T
19-1/2"
Diameter
560
lbs
1.25
cubic ft
25
lbs
17"
80%
3.57
grams/hr
35,000
btu
20,088
btu/hr
400 - 1200
sq ft
Hearthstone
Equinox
Soapstone
10"t
18"w
180 sq.in.
29" T
33-2/3" W
25-1/2" D
774
lbs
4
cubic ft
80
lbs
25"
82%
3.1
grams/hr
120,000
btu
62,675
btu/hr
2200 - 3500
sq ft
Hearthstone
Mansfield
Soapstone
10-5/8"t
17"w
179 sq.in.
28" T
27" W
24" D
585
lbs
3.2
cubic ft
64
lbs
21"
77.4%
2.9
grams/hr
80,000
btu
48,211
btu/hr
1800 - 2500
sq ft
Hearthstone
Phoenix
Soapstone
9-1/2"t
15"w
143 sq.in.
27-1/2" T
28" W
20" D
450
lbs
2.2
cubic ft
44
lbs
21"
75%
2.4
grams/hr
60,000
btu
33,145
btu/hr
1200 - 2000
sq ft

To visit any stove's page, click its photo in the table above.

Q: Greetings,
I'm just beginning to educate myself on modern-day wood stoves (been using a Fisher for decades) and I've seen stoves online for example, where one has an efficiency rating of, say, 75% with emissions at 3.5 gm/hr., and another stove will have efficiency of 72% w/ emissions at 2.3. I can't make sense of that. Can you shed some light on how these calculations are derived?
Thank you
Roger

SweepyHi Roger,

Thanks for the inquiry! A woodstove's heating efficiency rating doesn't correlate directly to its emissions rating. In fact, those numbers are arrived at in two different tests:

Emissions testing is performed in EPA-approved test labs using the EPA's prescribed protocol. When testing for emissions, a nailed-together "charge" of dimensional Pine is burned, and the particulate matter in the exhaust is measured throughout the duration of several fires at various draft control settings. In this way, an average grams/hour particulate emissions rating is derived. Heating efficiency is not measured during EPA emissions testing.

Heating Efficiency testing is performed using full loads of seasoned cordwood, and is designed to measure how much of the heat value contained in the wood is extracted and delivered into the living space. When testing for heating efficiency, the following criteria are examined:

Extraction Efficiency: the load is weighed going in, and the particulate emissions and ashes are weighed after the fire to determine how effectively a given firebox design breaks down the fuel to extract the available heat.

Heat Transfer Efficiency: this testing is performed in calorimeter rooms equipped with temperature sensors. Similar temperature sensors are installed in the exhaust flue. The degree changes in the room and flue are monitored for the duration of the test fires to determine how much of the heat extracted by the fire is delivered into the room, as compared to the heat lost up the flue.

Although a low emissions weight can improve a given stove's Extraction Efficiency score, the total amount of particulate emissions produced by today's EPA approved woodstoves is so small that the affect of particulate emissions on the overall heating efficiency score is negligable. Thus, even a model with an unusually low Emissions rating doesn't necessarily score a high Heating Efficiency rating.

Consider the two models you mention: the 1.2 gram/hr difference would lighten the total weight of emissions from the cleaner-burning stove by about 10 grams at the end of an 8-hour test burn. Most likely, those 10 grams would be found in the ash remaining in the firebox, eliminating any advantage in Extraction Efficiency. Even if the 10 grams weren't found in the ashes, a difference of 10 grams of particulates from a 40 lb. load of wood would only amount to a .06% advantage in Extraction Efficiency, which would have virtually no affect on the overall Heating Efficiency score.

You can read more about woodstove efficiency testing, from the viewpoint of the test labs, at http://www.hearthandhome.com/James%20Houck%20Articles/HH_01_August.Wood%20Untold%20Story.pdf

 

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