Test result: Three Stone Fire
Water boiling test (WBT)
Stove and fuel
Stove description
TSF carefully tended, wood fuel (Dry)
Stove characteristics
Three stone fire
Fuel type
Wood
Fuel description
Wood, dry
Fuel moisture content
not available
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 11.2 g/MJ-del 0.6 0.05
IWA high power PM 718.5 mg/MJ-del 60.0 0.08
IWA low power CO 0.197 g/min/L
IWA low power PM 8.567 mg/min/L
IWA efficiency  
Metric Value SD (σ) Cv
IWA high power thermal efficiency 14.9% 0.35 0.02
IWA low power specific consumption 0.066 MJ/min/L
IWA indoor emissions  
Metric Value SD (σ) Cv
IWA CO 0.934 g/min
IWA PM 49.875 mg/min
Efficiency, energy consumption and fuel use
Metric Value SD (σ) Cv
Fuel consumed 276.0 g/task
Hot start thermal efficiency 15.0% 0.1 0.01
Cold start thermal efficiency 14.8% 0.6 0.04
Output
Metric Value SD (σ) Cv
Cold start firepower 8262.0 W 789.0 0.1
Hot start firepower 9426.0 W 806.0 0.09
Simmer firepower 4692.0 W 439.0 0.09
Mean time to boil 26.6 min 1.9 0.07
Emissions
Metric Value SD (σ) Cv
CH4 emissions factor (2) 1.58925 g/kg fuel
CO emissions factor (2) 46.02 g/kg fuel
PM2.5 emissions factor (2) 2.3025 g/kg fuel
CO emissions rate 0.934 g/min
PM2.5 emissions rate 52.69976327 mg/min