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🔥 Gas Rating Calculator
Imperial stopwatch method & Metric 1-minute test
📊 Imperial (ft³)
Time 1 dial revolution
0.0s
▶ Start
■ Stop
↻ Reset
Seconds per Revolution
Calculate
Net Input
matches boiler data plate
Gross Input
calorific value incl. latent heat
Flow Rate
gas consumption
⏱️ Metric (m³)
1 minute countdown test
1:00
▶ Start
■ Stop
↻ Reset
Start Reading (m³)
End Reading (m³)
Calculate
Net Input
matches boiler data plate
Gross Input
calorific value incl. latent heat
Flow Rate
gas consumption
💡 Typical Boiler Output Sizes
1-2 bed:
24-28 kW
2-3 bed:
28-32 kW
3-4 bed:
32-35 kW
4+ bed:
35-42 kW