I was wondering how much gas my boiler pilot light consumed and took a meter reading at 9pm yesterday and again at exactly 9pm today. The heating & water have been off all that time with just the boiler pilot light lit. I included the 2 red decimal numbers in the meter readings and in 24hrs had used 0.18 unit, which over a year is 65.70 units. If my sums are correct (Calorific Value of 39.4) I work that out to be around 2081kWh. Is that amount of consumption right for a pilot light? The boiler is a Potterton Prima B about 6 years old.