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2014 Heater Fuel Tests at Shawville

Test HK-M25
March 7, 2014

White birch cordwood. Large wood, mix of wet and dry (see fueling details in Condar spreadsheet)
Side ignition.  Newspaper 3/4 up the kindling pile.
61.7 lbs including 5.2 lbs kindling
22.4% moisture
Cleanest burn recorded on this heater to date.

Stack temperature corrected for height.
Pisla HTT 602 door, 22" wide
Austrian eco firebox, see
Custom air frame, setup "D"
Rear grate closed

Condar Spreadsheet Results
Condar Spreadsheet Results

Condar Spreadsheet (includes detailed fueling data)

Animation,  5 minute intervals.  Newspaper is located 3/4 up the kindling stack. Very staged start. Sequence goes to 140 minutes.
Note after the whole pile catches and is flaming strongly, the flaming goes down , then up again.

See burn videos, below.

gas analysis
Flue gas

TESTO Excel data file

Testo graph
Testo gas graph, entire cyle.
On the red flue temperature curve, at the beginning the sensor is in room air and then immediately goes into the closed flue. After about half an hour, the flue damper is opened, and then the ashbox door, and then the heater door.

Opacity graph. 
Note very clean start due to staged kindling. 
Note the pile collapse at 85 minutes, and then a poke to lift the two bottom unburned pieces buried under charcoal.


White birch cordwood, loose barch removed. Largest pieces were placed at the bottom, smallest pieces at the top.

Stacked in firebox

Burn sequence to 140 minutes

This page was updated on March 7, 2014
This page was created on March 7, 2014