Calorific value (CV)
The energy released by burning a set volume of gas, usually in MJ/m³. It varies a little by area and day.
Natural gas in Great Britain is typically around 39 to 40 MJ/m³. Gas suppliers print the calorific value used for billing on gas bills.
When working out heat input from a gas rate, use the calorific value you work to; small differences change the result slightly.
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A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.