spurting hot taps ? cause

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After an extension (involved fitting 2 new rads), hot water from the taps spurt violently for 1-2 mins. Also (in bath) can run dry but re-start after turning off for 1-2 mins. CH is fine, although it was suggested water temp be increased. 9 yr old house, combi boiler.
 
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Is all the not water fed directly from the combi (i.e. no hot water cylinder) and is the combi fed directly from the mains (i.e. no feed tank)?
 
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ahem, apologies wrong information first time round. . . . Not a combi boiler.

Grateful for your thoughts,

Almac
 
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DIA, I was thinking of a dodgy connection for the new hot water pipe in the roof space from the existing open vent. ;)
 
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No taps in extension, affected taps elsewhere around house. Thanks for the pointers, V helpful (were concerned about quality of plumbing when job was done, leak during build led to wall having to be re-plastered, so your suggestions fit with my concerns).

Thanks again.
 
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Hold a jar of water under the vent pipe to the storage tank, then get someone to open the affected taps, if the water sucks out you have found the problem
 
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Check for blockage in the pipe from the tank to the cylinder. A restriction here will cause air to suck in at the vent as doitall says.
First time I had come across it there was an iron fitting which shouldnt have been there and had rusted up. An unopened gate valve can also be a cause as can some debris on the tank outlet.
 

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