According to WB,30mtrs (equivalent length) of 28MM will deliver 4.7m3/h so you just about ok at 3.2 m3/h (30 CDI-30.9KW)
condensing boiler gas supply is 15mm ok
- Thread starter wennners
- Start date
According to WB,30mtrs (equivalent length) of 28MM will deliver 4.7m3/h so you just about ok at 3.2 m3/h (30 CDI-30.9KW)
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ive had this problem on a few jobs and the corgi inspector actually assessed me on a vaillant 824 that had 6m on 15mm pipe with no other appliance on. He said it was'nt a problem (as did vaillant technical) as long as the gas inlet and gas rates could be achieved at maximum rate. The 824 actually has a 15 mm inlet. When it has looked a bit dodgy i always explain this and say if we cant get the right pressure and rates then a new gas pipe will have to be run.
like a few others on here have stated theres no reason it cant be run outside if its possible. If its not a huge job and mess to change the pipe though i would personally change it to 22mm or higher if needed
like a few others on here have stated theres no reason it cant be run outside if its possible. If its not a huge job and mess to change the pipe though i would personally change it to 22mm or higher if needed
Outside could be the way to go however depends on loads of stuff like distance etc.
No you don't need to protect the pipe unless there is vehicular traffic or similar likely to damage it.
Tony.
As it's a 38Kw then You can forget the 15mm and possibly 22mm, depending on how long the run is. If this has the same tails as the Vaillant 438 then the gas will be 22mm off the boiler.
This boiler will need 4m3/hr gas supply to work properly.
This boiler will need 4m3/hr gas supply to work properly.
<<<FOr example, I just put in a 28kw combi.
20metres of 28mm pipe, all completely deburred, 10 elbows, and a little 22mm coming off the meter.
Drop shows the pipe is undersized. Go figure.>>>
It has been known in cases like this to give the meter governor a tweak!
20metres of 28mm pipe, all completely deburred, 10 elbows, and a little 22mm coming off the meter.
Drop shows the pipe is undersized. Go figure.>>>
It has been known in cases like this to give the meter governor a tweak!
B
Bambergaspipe
22mm from meter to boiler, End of story.
end of story my ass
22mm is good for a 38Kw boiler up to a maximum 15m less any bends, you would almost certainly require 28mm if its going outside.
How come nobody has mentioned 35mm?
Anyhow, if someone wants to use 15mm to feed a combi boiler, well no probs. It is a free country (me thinks), you can do what you like.
Just now finished a call where the inlet pressure at the boiler is 11.5mbars with no other appliances running. Boiler is a 28kw combi on a 15mm gas line. 22mm pipe goes through the wall from the gas meter. House heating poor and hot water delivery miserable.
Anyhow, if someone wants to use 15mm to feed a combi boiler, well no probs. It is a free country (me thinks), you can do what you like.
Just now finished a call where the inlet pressure at the boiler is 11.5mbars with no other appliances running. Boiler is a 28kw combi on a 15mm gas line. 22mm pipe goes through the wall from the gas meter. House heating poor and hot water delivery miserable.
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