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WOOD FIREPLACE INSERT COMPARISON PAGE

Sorted By: SUSTAINED OUTPUT (8 HOUR BURN)

Sweepy

While it might be possible to heat a large house with a small insert if you crank the draft control wide open and stand by to add fuel every few minutes, the preferred method is to buy a larger insert and refuel less often. The industry standard for airtights on a low draft setting is a 6-8 hour, "all night" fire, with coals left at the end of the burn to ignite a fresh load. This column shows the average output over 8 hours.

To sort the table, click the column header (ie; Fireplace Size, Shipping Weight, etc.)

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Model
Minimum
Fireplace Size
Shipping
Weight
Firebox
Size
Hardwood
Capacity
Max. Log
Length
Heating
Efficiency
EPA
Emissions
Maximum
Output
Avg. Output
8 hour burn
Heating
Capacity
Pacific
Summit
Plate Steel
23-1/8" T
28" W
18" D
500
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
Clydesdale
Cast Iron
23" T
33" W
15" D
585
lbs
2.4
cubic ft
48
lbs
22"
79%
3.1
grams/hr
75,000
btu
38,087
btu/hr
1200 - 2000
sq ft
Hearthstone
Homestead

Soapstone
21-1/2" T
6" W
6" 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
Pacific
Alderlea T5
Plate Steel/
Cast Iron
21" T
24-1/2" W
18-1/4" D
475
lbs
2.1
cubic ft
41
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1000 - 2000
sq ft
Pacific
Super
Plate Steel
21" T
24" W
18" D
410
lbs
1.97
cubic ft
39.4
lbs
18"
82.6%
3.4
grams/hr
72,000
btu
32,688
btu/hr
1000 - 2000
sq ft
Hearthstone
Morgan

Cast Iron
23" T
26" W
15" D
425
lbs
1.7
cubic ft
34
lbs
18"
79%
4.3
grams/hr
40,000
btu
26,978
btu/hr
700 - 1500
sq ft
Pacific
Neo 1.6
 Plate Steel
20" T
30" W
16-1/4" D
300
lbs
1.6
cubic ft
32
lbs
18"
81.5%
3.9
grams/hr
70,000
btu
26,129
btu/hr
700 - 1500
sq ft
Pacific
Vista
Plate Steel
22" T
25" W
15" 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

To visit (or return to) any insert's page, click its photo in the chart above.

Note: Output ratings can be confusing. To read about the difference between EPA ratings, Maximum Output ratings and the 8-hour burn ratings shown in the blue column above, click here.

Some of our fireplace inserts are extremely tightly made, and will hold hot coals up to 14 hours after fueling when adjusted to their lowest draft control setting. We have scaled all burn times to 8 hours for comparison purposes.

Mathematicians: In order to compute the heat output of a given insert over a given period of time, we need to know the heat value contained in a full load of wood, the efficiency at which the insert extracts that heat, and the duration of the burn. We derived our sustained burn comparison figures using the formula below:

( firebox size in cu. in.) x ( 0.015 ) x ( 6200 ) x ( stove efficiency ) / ( burn time )

To get the firebox size in cubic inches, we multiplied the cubic foot measurement from the chart above by 1728.

The 0.015 is the weight of the load per cubic inch. To get this number, we used an average of the top 60 species from our firewood comparison chart, and adjusted to compensate for airspace between pieces.

The 6200 is the available BTU (heat) content per pound of fuelwood at 20% moisture content.

For stove efficiency, we used the manufacturer's tested Low Heat Value rating, not the rating on the EPA label. The EPA doesn't test for efficiency, and there's a disclaimer to that effect on each label. Each label also shows the exact same efficiency rating. Why they even bother to put that number on the labels we don't know, but we do know that all woodstoves don't operate at exactly the same efficiency, so we don't use it.

For burn time we used 6 or 8 hours, depending upon firebox size, which is an industry standard we know all our wood inserts can meet (even the little guys, if you're burning top-of-the-chart hardwoods).

Note that the average btu/hr rating derived by this formula does not reflect how the heat is actually delivered over the course of the fire. In the real world, a fresh load of wood delivers much more heat toward the beginning of the fire when the gasified resins are being consumed, then gradually delivers less and less heat as the fire proceeds through the charcoaling process. This actually works out quite well, as it takes more btu's to bring a cold house up to temperature than it does to maintain that temperature.

 

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