In an earlier contribution to this discussion,
Geronimo W. Christ Esq wrote:

Roger Mills 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, a bit. Looking at mine for the last 3 years, it has ranged from
39.0 to 39.6 - not a massive amount, but about 1.5%

Am I right in guessing that a higher calorific value means that more
energy is released when the gas is burnt ?


Yes


Is this just the gas companies fleecing people, or does it cost them
more to supply gas with a higher calorific value ?

Don't know about the cost to them, but you're paying for *energy*, so can't
really complain.

Same with electricity. If the voltage goes up, you get less amps per
kilowatt - but it doesn't matter.
--
Cheers,
Roger
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