Cubic ft to kwh

joe134

Hi Guys, had a bill from Scottish power,and they say I used 112 cubic ft of gas = 3583 kWh,s
I have checked this on at least five conversion sites, and get a different figure each time, SP being the highest?
3520 being the lowest!
Any ideas on why they all vary.
Don’t they all use the same formula ?
Here's how to convert cubic feet (ft3) to kWh from your gas meter reading. 482 unit used X 2.83 to convert to cubic metres X 1.02264 X 39.2 calorific value divided by 3.6 provides 15,189 kWh. At 2.84p/kWh provides an estimated bill of £431.38.

daveyjp

Your bill will explain how it is done.
The calorific value is variable, hence different results.

Cardew

joe134 wrote: »

Any ideas on why they all vary.
Don’t they all use the same formula ?
Here's how to convert cubic feet (ft3) to kWh from your gas meter reading. 482 unit used X 2.83 to convert to cubic metres X 1.02264 X 39.2 calorific value divided by 3.6 provides 15,189 kWh. At 2.84p/kWh provides an estimated bill of £431.38.

They vary because the Calorific Value varies

Step 3

This figure is then multiplied by the calorific value of the gas which is a measure of the available heat energy. Calorific values vary and the figure quoted on your bill (eg 39.5 megajoules per cubic metre (MJ/m³)) will be an average of the gas supplied to your property (the regulations explain how this is calculated). Gas transporters are required to maintain this figure within 38 MJ/m³ to 41 MJ/m³ as figures outside of this range will cause problems with gas burning appliances.

joe134

Thanks guys, didn’t realise calorific was variable:beer:

D_M_E

Is your meter actually measuring in cubic feet - does it say cubic feet or cft or ft3 on it?

Or does it instead have M3 or cubic meters on it?

If it says M3 then you are being charged about 2.8 times what you should be - worth checking.