Fitting new combi boiler using existing single pipe system

Joined
23 Dec 2006
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Location
Southampton
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United Kingdom
I am in the process of getting quotes for replacing my old back boiler with a combi boiler and the first heating engineer to call has said that I will need to convert my existing single pipe system to a dual pipe system! Is that correct? No combi boilers will work with a single pipe system!
 
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Some manufacturers explicitly forbid it, nobody recommends it. If you system's that old you probably have rads which are due for replacement? TRVs are a problem too.
Converting to 2 pipe is not that hard when you look into it, and well worth it.
 
By the time that you consider whats required then its almost worth replacing all the rads anyway.

Many of the rads on one pipe systems were undersized by current standards.

Tony
 
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i have fitted 2 combi's on one pipe in last 2 weeks and they both worked fine but chris had it right that it's not recommended and i also didnt recommend it but customers choice :rolleyes:
 

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