Replacing an old boiler with new often means replacing the gas pipework too because it might be undersized from the previous installation or you might want to fit a new 30kw boiler when the old one was only rated 24kw. The bigger the boiler the more gas flow it requires to work.
So at a glance and without making complicated calculations, what size copper gas pipe do you need for your new boiler?
Here's a rough guide to help you gauge it at a glace.
Important; the table below is only good for when you have a single natural gas appliance.
If your supply is LPG or you have an additional gas appliance e.g cooker, hob or fire the calculation needs to take that into account too and will vastly differ from those below. Always get your Gas Safe heating engineer to work it out accurately before installation.
Note that the overall length is calculated by taking the actual distance in meters of pipe from the gas meter to the boiler and then adding 0.3 meters for every time the pipe changes direction (bend in the pipe) and 0.5 meters every time it changes direction with a elbow fitting. For example; if you have a 10 meter pipe and it has 5 bends and 5 elbows then you have to add on 1,5 meters for the bends and 2.5 meters for the elbows. So your final length would be 14 meters total.
If you can, it is always better to use a bigger size pipe than what is required.
So at a glance and without making complicated calculations, what size copper gas pipe do you need for your new boiler?
Here's a rough guide to help you gauge it at a glace.
Important; the table below is only good for when you have a single natural gas appliance.
If your supply is LPG or you have an additional gas appliance e.g cooker, hob or fire the calculation needs to take that into account too and will vastly differ from those below. Always get your Gas Safe heating engineer to work it out accurately before installation.
Note that the overall length is calculated by taking the actual distance in meters of pipe from the gas meter to the boiler and then adding 0.3 meters for every time the pipe changes direction (bend in the pipe) and 0.5 meters every time it changes direction with a elbow fitting. For example; if you have a 10 meter pipe and it has 5 bends and 5 elbows then you have to add on 1,5 meters for the bends and 2.5 meters for the elbows. So your final length would be 14 meters total.
If you can, it is always better to use a bigger size pipe than what is required.
Boiler Rating41 Kilowatt boiler requires 36 Kw 31 Kw 26 Kw 24 Kw 20 Kw 18 Kw 16 Kw 14 Kw 12 Kw | Overall Length Maxup to & including 12 meters ≤ 15 m ≤ 20 m ≤ 3 m ≤ 25 m ≤ 30 m ≤ 4.5 m ≤ 6 m ≤ 7.5 m ≤ 9 m ≤ 12 m ≤ 15 m | Copper Pipe Sizeof 22 mm pipe 22 mm 22 mm 15 mm 22 mm 22 mm 15 mm 15 mm 15 mm 15 mm 15 mm 15 mm |
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