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Hi Tony Yes I did as you said and all seems to be fine. Thanks for your advice and for taking time out to reply Cheers BF

I have installed the expansion vessel today - (only a couple of leaks - now cured :) ) All seems to be well - It took me all day though! (stop sniggering all you plumbers out there !) I used a PRV for the sake of a few quid thought it was worth it. Thanks to everyone for their...

LOL :D - no need to post on the other forums unless you feel the urge to. Thanks for the info BF

another "final" question please Do I need to set adjust the new vessel dryside pressure to be thasame as the Baxi original (The new vessel is charged ar 1.5 bar - Baxi vessel is pre charged at 0.5 bar ? Thanks BF

So every member is a member of every forum - i think not still not like you to moan :)

I tend to agree with you - the likely hood of the existing PRV in the system being over pressurised and isolated "accidently" is pretty unlikely , but like I say, for the sake a few extra squids i will fit one. i will not fit an isolating valve, can't see much point other than for replacing...

Thanks Gavinda. The opinion regarding PRV seems to be divided so for the sake of an extra £10-15 I think i will fit one. I will tee into the external outlet of the existing PRV If luck is on my side i will be able to mount it very close to existing pipe work and thus should not be too...

Firstly - Thanks to all for the advice I am going to fit 12l external to the 22mm return with PVR (I will buy the vessel"kit" ), I will not use the filling loop. Final question (I wish!:)) - Can I mount the vessel upside down? ie valves at the bottom. This would make the pipe work much...

Hi This lively debate is very "interesting" but I am pretty sure my boiler is not an "instant" It is the 105e CGN 4707508. so my understanding to date from these posts is: 1) It is possible to fit an XEV - (return side) 2) Secondary PRV would be a good idea but is only...

Thanks for the advice Big Burner :)

Thanks Tony - I now understand, This assumes that the boiler has been isolated and at the same time the filling valve is opened or leaks and that the filling loop is connected ? Simple scenario yes but likely ....um Better to be safe than sorry though Thanks BF

Hi Tony I am not asking for training, I am just looking for advice, but if you don't have the answers then that' fine. I am a fully qualified mechanical engineer so do understand a little about fluid dynamics, and so my logic is that if the boiler is isolated then how can it build up 3bar...

Hi Tony Thanks for the prompt response, So if i understand correctly, the PRV on the boiler could get isolated if the the boiler valves are turned off. but how would the pressure then build up in the EXV to warrant (and crack) a seperate PRV ? The tool operated isolation valve is a...

my combi boiler expansion vessel is also shot so i want to fit an external one . The boiler has Pressure Relief Valve, filling loop and gauge so i'm assuming i can just plumb a new vessel in to the CH return without having to use another PRV, gauge and filling loop? Do i need any seperate...

Hi all, this is my 1st post so hopefully i have not messed up:) my combi boiler expansion vessel is shot so i want to fit an external one . The boiler has Pressure Relief Valve, filling loop and gauge so i'm assuming i can just plumb a new vessel in to the CH return without having to use...