Pressurized CH system ?

[jumpeyspyder]

Hi
I have an ancient conventional boiler in the cellar of a terrace house with a loft conversion.

I am thinking of changing to a condensing combi boiler and also adding a rad to the attic room.
(with a young family, instant hot water would make bath times much easier and I would also get more space in the bathroom by losing the storage cylinder)

A couple of plumbers have visited to give me quotes and they have both mentioned that due to the new system being pressurized the old pipework could spring a leak.
Are they just covering themselves or is this something I should be worried about ?

thanks for reading

 

[ChrisR]

There's a chance. If you change any dodgy looking rad valves and rusty radiators then it's a small chance.
A sealed system doesn't have an endless supply of water like a tank fed one, so if there IS a leak it's unlikely to be catastrophic.
Don't worry about it, just deal with it if it happens!

 

[jumpeyspyder]

Thanks Chris

 

[Diyisfun]

Instant hot water...thats good but you also need the bath to fill quickly.
I think if you remove the storage tank, you will live to regret it.