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Surestop: It's a nice idea but it will restrict the flow. To try to avoid this as a problem we fitted a 22mm unit instead of 15mm. I was disappointed to find the flow at the kitchen tap (first branch off the main) was reduced by about 20% - from 16.8 l/min to 13.2 l/min. The shower was...

Thanks Paul Barker and FiremanT for your comments. I guess that my OP could use a little additional explanation; I was just trying to keep it brief and to the point... The fault that I called Heateam ('The Service Division of Baxi Group') for was a problem with the hot water heat...

Hello all, I received a very courteous reply from Heateam's Customer Relations (no need to give the person's name). The reply had three main points, I believe: 1) They are aware of 'a very small number of similar failures of this component'. 2) They were willing to provide a replacement...

Thanks everyone for the replies. Gasescape, what was the approximate age of the installation you saw this on? I wonder if there's been a bad batch of flue tubing from somewhere a few years back? I'd bet that Potterton and others source from the same manufacturers. Quick update: My...

Hello All, I had a Potterton ProMax 24HE combi boiler installed about 6 years ago which recently developed a fault. An engineer visited and diagnosed that, among other things, the flue had failed - he thought probably the seals between the different sections of the concentric flue had failed...

Inner tube of concentric flue 2

Inner tube of concentric flue 1

Pictures for reference in forum post.