Gas meter accuracy

[Mr Parry]

Just had my boiler services and test was 28.23kw/hr on a 30kw/hr boiler. This result was after running at this max for 2 minutes. Therefore I have calculated the following 28.23/60*2=0.941Kw use over the 2 minute test. Gas meter reading used 0.096m³. Using the standard m³ to Kw calculation 0.096*40*1.02264/3.6= 1.09Kw. This means that the gas meter is reading 16% more than the actual gas used on the boiler test. Can anyone confirm that I have calculated this correctly and if so I thought the accuracy of a smart meter had to be a lot more accurate than this.

 

[Mr Parry]

Am I understanding correctly here - you are assuming 100% conversion of the gas burned into energy ? No boiler is 100% efficient - so back of fag packet would be yours is ~85%.

Surely asking the engineer who serviced the boiler would be a better start than a computer forum though.

Im asssuming my boiler is runnig at 94% efficiency if the net reading is 28.23kw on a 30kw boiler

 

[Mr Parry]

Have you factored in the gas in the pipework from the meter to the boiler?

Our boiler has a 22mm pipe feed & is approx 10m from the meter so there's about 0.22m sq of gas that's passed the meter but not yet used by the boiler.

My boiler has about 1.5m of 22mm pipe to the meter. Im just trying to work out if my meter is faulty but factoring in all the things that you are mentioninig it may be ok. Im not educated in the boiler and plumbing world to pocess the knwoledge that you have so Im probably guesiing that things are not as bad as I first thought. Is that your opinion too? PS thanks for your time regarding this.