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Joined: 04 Aug 2005
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 Posted: Thu Sep 01, 2005 1:44 am 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.

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 Posted: Thu Sep 01, 2005 8:38 am Gas is sold by volume, not kWH units. Make sure you're reading your meter accurately - yours sounds like it's metric so cubic metres, then the fig should be on the bill. Used to be about a fiver a year.

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Posted: Thu Sep 01, 2005 5:59 pm

 panther wrote: 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.

I WAS TOLD if you left a pilot on for a full year it would cost about £42

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 Posted: Thu Sep 01, 2005 6:38 pm i only have gas central heating my pilot [which is turned up a bit to much]uses about a unit a week[3 weeks 3 units] empty house so about 50p at present values time 52 about £26 a year

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 Posted: Thu Sep 01, 2005 7:44 pm Gas consumed by pilot lights is not entirely wasted. It contributes something to heating output, prevents the boiler heat exchanger from freezing and, in the case of a combi boiler, will improve response to hot water demand by preheating the heat exchanger.

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 Posted: Thu Sep 01, 2005 8:47 pm My energy suppliers charge me for gas by the kWH. It was always stated in the Launderette industry that a pilot light in a gas dryer consumed about £37 p.a. but that figure goes back a few years. I would therefore support Bobs figure of £42 as about right, although as Chris says its not all wasted so perhaps the real cost is about £30 p.a. For several years the boiler industry has not been producing boilers with standing pilots because of the gas wastage. That is just part of the saving from switching to a condensing boiler. Tony Glazier
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