Test result: Three Stone Fire
Water boiling test (WBT)
Stove and fuel
Stove description
TSF minimally tended
Stove characteristics
Three stone fire
Fuel type
Wood
Fuel description
Red Oak (Quercus rubra), dry
Fuel moisture content
0.097%
Fuel net calorific value
17.7 MJ/kg
Test information
Test details
WBT 4.1.2, 5 Liters of water
Testing organization
Reporting type
Third party
Country
United States
Year performed
2012
Test environment
Lab
Altitude
not available
Number of replicate tests
3
Test result IWA tiers of performance
Show subtiers
0
Emissions
0
Efficiency
0
Indoor emissions
unrated
Safety
Performance metrics
IWA emissions  
Metric Value SD (σ) Cv
IWA high power CO 15.1 g/MJ-del 0.95 0.06
IWA high power PM 1350.0 mg/MJ-del 335.0 0.25
IWA low power CO 0.246 g/min/L
IWA low power PM 14.033 mg/min/L
IWA efficiency  
Metric Value SD (σ) Cv
IWA high power thermal efficiency 13.7% 0.7 0.05
IWA low power specific consumption 0.068 MJ/min/L
IWA indoor emissions  
Metric Value SD (σ) Cv
IWA CO 1.137 g/min
IWA PM 82.0 mg/min
Efficiency, energy consumption and fuel use
Metric Value SD (σ) Cv
Fuel consumed 301.0 g/task
Hot start thermal efficiency 13.6% 0.5 0.04
Cold start thermal efficiency 13.7% 0.9 0.07
Output
Metric Value SD (σ) Cv
Cold start firepower 7806.0 W 566.0 0.07
Hot start firepower 9249.0 W 1230.0 0.13
Simmer firepower 4861.0 W 692.0 0.14
Mean time to boil 31.0 min 2.25 0.07
Emissions
Metric Value SD (σ) Cv
CH4 emissions factor (2) 1.955 g/kg fuel
CO emissions factor (2) 55.8075 g/kg fuel
PM2.5 emissions factor (2) 3.7775 g/kg fuel
CO emissions rate 1.137 g/min
PM2.5 emissions rate 85.51751564 mg/min