Hi Deepish,Thank you for your response to my enquiry. However, my enquiry was referring to our gas bill's "conversion factor" not "pressure factor" nor "heating value". We live in a high rise building where all 157 apartments share the same hot water service and piping but in discussion with neighbours, each of the apartments have various "conversion factors" stated on their bills. No one has an item on their bills called "Pressure Factor" or "Heating Value". If these measures exist, then how ar ...