How to relate ft2 on Gas meter with gas bill & cost

buglawton

Just had a new boiler and am curious to know the daily cost. So for example I know that in 4 days I used 3.78 ft2 per the meter. Looking at my gas bill it talks about kWh and TCR but does not mention ft2 (the units I input my meter readings in).

So how do I relate my volumetric consumption to my units in my gas bill, and so go on to calculate the cost?

Cardew

It is cubed feet i.e. ft3.


On an Imperial gas meter 1 gas unit is approx. 32kWh.* Note a gas unit is 100 cubic feet.
So in 4 days you used approx 121kWh (3.78 x 32)


* This can vary slightly depending on the calorific value of the gas.

buglawton

About £5 worth of gas on my tariff then it seems, based on "4.19
pence per kWh". Plus about 80p standing charge. Thanks.

Cardew

4.19p/kWh is hugely expensive - as is the daily standing charge.


There are plenty of tariffs where gas is considerably less than 3p/kWh.

Chrishazle

On my gas bills they show how they convert meter reading to KWh. Formula is :

Units used x Volume Conversion factor x Calorific Value / 3.6.

Units used is current meter reading minus last meter reading.
Volume conversion factor is 1.02264
Calorific Value varies between 39.1 and 39.3

FYI I'm on the BG/CheapEnergyClub fixed Feb2017 dual fuel tariff, SC 18p+VAT/day, gas 2.86p/KWh+VAT

Cardew

Chrishazle wrote: »

On my gas bills they show how they convert meter reading to KWh. Formula is :

Units used x Volume Conversion factor x Calorific Value / 3.6.

Units used is current meter reading minus last meter reading.
Volume conversion factor is 1.02264
Calorific Value varies between 39.1 and 39.3

That calculation is for converting a metric gas unit to kWh. - a metric gas unit is 1 cubic metre.


The OP has the older Imperial gas meter. An Imperial gas unit is 100 cubic feet and is 2.83 times bigger than a metric gas unit. Thus the result obtained by your calculation needs to be multiplied by 2.83.


As said earlier it really isn't worth going through those long calculations unless you need exact conversions. Just use 11.2kWh for a metric gas unit and 32kWh for an Imperial gas meter.
https://www.gov.uk/guidance/gas-meter-readings-and-bill-calculation

buglawton

Cardew wrote: »

4.19p/kWh is hugely expensive - as is the daily standing charge.

There are plenty of tariffs where gas is considerably less than 3p/kWh.

My standing charge is 20p/day not a million miles from Chrishazie's, anyway I'm in a fix with a month before getout, and this time may go with separate gas & electric e.g. Zog for gas and Isupplyenergy for leccy.

reeac

As a physicist (retired), I love the surreal concept of gas by the square foot!