Plumbing Question

Can you leave old existing pipework when changing from a back boiler to a baxi combi boiler?

I have recently had a plumber remove my back boiler and fit a combi boiler and 8 we radiators. Now only 5 out of 8 radiators get hot, the other 3 which are in 2 bedrooms and loft bedroom, only get slightly warm.

The plumber told me this is because those 3 radiators are on the old micro bore pipes and are on a 1 way system, the other 5 are running on a 2 way system. I expected new pipes with my new heating system and new bigger radiators but he says I didn't pay enough for that, I paid £3100 cash. Shouldn't he have known my system wouldn't work well and at least advised us of this?

He has told us he will change the pipework for £200 but he cannot start the work until the 23rd of December, almost a month after the work was completed. In the meantime, he has advised us to empty some water from the boiler, which is dirty (!) and to turn a valve to turn the pressure bar up. Surely this isn't right, won't I have all the dirt from my old pipes running through my boiler and shouldn't he have changed my old pipes especially the micro bore and fitted a 2 way system?

My bedroom temperature when the heating is on constant will only go up to 18c 15c in the loft bedroom. If anyone could give me some advice it would be really appreciated.

Thanks, Julie.

1 Answer

Best Answer

If it was me, I would always change micro bore. I am in a very hard water area, and always change pipework regardless. In the very least, it should have been flushed out to clear all the old sludge and debris from the system.
If it is the higher radiators on the circuit, it seems to e that you may have either a blockage in the pipework, or an airlock, or the boiler may not have sufficient pressure to push the heated water all the way around the system, I would suggest you get the original installer to return and check it.

Answered 16th Dec 2013

Midsomer Bathing

Member since 14 Nov 2013

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