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Pipe sizing for heating systems

 
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hughstary



Joined: 21 Oct 2003
Posts: 30
Location: Hampshire
PostPosted: Fri Jul 02, 2004 7:45 am    Post subject: Pipe sizing for heating systems Reply with quote
In a typical 3 bed house, i.e. 7-9 rads, would you run pipework in a mixture of 22mm and 15mm, or just use 15mm throughout ? I have heard a figure of 40K btu max for 15mm - is this correct ?

Thanks
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vince knight
Moderator


Joined: 04 Mar 2004
Posts: 1343
Location: Essex/East London
PostPosted: Fri Jul 02, 2004 4:41 pm    Post subject: Reply with quote
I think i'm right in saying it is 22mm for the primarys from the boiler to pump and control valves then 15mm for each floor to the rads.

Vince
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thescruff
Moderator


Joined: 03 May 2003
Posts: 4754
Location: Bath
PostPosted: Mon Jul 05, 2004 3:11 am    Post subject: Reply with quote
from the MV in 22mm then split 15mm to each floor on a small system otherwise 28mm too valve and 22mm too each floor.

scruff
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hughstary



Joined: 21 Oct 2003
Posts: 30
Location: Hampshire
PostPosted: Mon Jul 05, 2004 8:32 am    Post subject: Reply with quote
Thanks guys,

What about in a combi system ?
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thescruff
Moderator


Joined: 03 May 2003
Posts: 4754
Location: Bath
PostPosted: Sun Jul 11, 2004 5:15 pm    Post subject: Reply with quote
Same rules.

scruff
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