On Wed, 8 Nov 2006 15:57:06 UTC, "Geronimo W. Christ Esq"
wrote:

Andy Wade wrote:

4. Multiply by the declared calorific value (CV - see last gas bill) to
get consumption in Megajoules.

I've always wondered why this is required. Does the calorific value vary ?

Yes. Not by much, but yes.

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