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 low power CO 0.197 g/min/L
IWA low power PM 8.567 mg/min/L
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 efficiency  
Metric Value SD (σ) Cv
IWA low power specific consumption 0.066 MJ/min/L
IWA high power thermal efficiency 14.9% 0.35 0.02
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
Cold start thermal efficiency 14.8% 0.6 0.04
Hot start thermal efficiency 15.0% 0.1 0.01
Output
Metric Value SD (σ) Cv
Mean time to boil 26.6 min 1.9 0.07
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
Emissions
Metric Value SD (σ) Cv
PM2.5 emissions factor (2) 2.3025 g/kg fuel
CO emissions factor (2) 46.02 g/kg fuel
CH4 emissions factor (2) 1.58925 g/kg fuel
PM2.5 emissions rate 52.69976327 mg/min
CO emissions rate 0.934 g/min