The figure is then multiplied by 1.02264 as prescribed in the above regulations. 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. 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). This figure is then multiplied by the calorific value of the gas which is a measure of the available heat energy. This step is not required for metric meters as they are read directly in cubic metres. The conversion factor from cubic feet to cubic metres is 0.0283 therefore:įor imperial meters the reading (in hundreds of cubic feet) is therefore multiplied by 2.83 to convert to cubic metres (if the reading to the supplier was provided in cubic feet then this should be multiplied by 0.0283). Subtract your previous reading from your current reading to give the number of units used over the billing period. All conversion factors are prescribed in the Gas (Calculation of Thermal Energy) Regulations ( SI 1996/439). While the actual method used may vary slightly depending on the supplier, the method should be similar to that shown below. Information found on the gas bill itself will generally explain how the bill has been calculated.
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