Replacement expansion vessel placement

[Jim K..]

Put it low down & it can "air" the cupboard, a bit (like the good old days, a bit) :-)

[Lee]

Hi, need to replace a failed boiler expansion vessel* how critical is it to place an additional (replacement) expansion vessel close to the boiler? From what I read it seems the concensus is as close to the boiler as possible or Bad Things will happen, but I've also seen installations where a system boiler has an expansion vessel in a remote cupboard. So it can't be all that bad?

*Vaillant, so no surprise there, but it did manage to last a few years. I really don't want to demount the boiler to replace the internal one and space around the boiler is very limited, hence the question.

[newshound]

Doesn't really matter IMHO.

[Pancho]

Mine is in my loft, where the old feed tank was.

I can't see why it would need to be close to the boiler.

[Jethro_uk]

I replaced mine and felt keeping it as close to the boiler as possible was a Good Thing. Luckily I had space in the room to mount it high, and it's been nearly 2 years now.

More important is which side to connect it to. Mine is fitted to the return side as it runs cooler so is kinder to the diaphragm.

[John Rumm]

The location of it is not really that important.

Most modernish Vaillant boilers have a very easy to get at expansion vessel - typically on the right hand side of the case. Vis (silver thing top right):

[tabbypurr]

makes little difference where it is as long as it never gets cut off from the boiler primary circuit.

NT

[Tim+]

Our boiler is in the loft, our expansion tank in in the garage. Has worked fine for the last ten years. I would say that it?s not that critical. ;-)

Tim

[Thomas Prufer]

Install a cutoff valve anyway, thus ensuring that the expansion vessel will never fail because now you can swap it out with ease?

Thomas Prufer

[tabbypurr]

I've seen plumbing jobs where it looks like someone was working with Es.

NT

[Lee]

On 05/06/2019 14:29, John Rumm wrote: <snip>

It would be nice, but there isn't enough clearance above the boiler to remove the Expansion vessel in situ - at least according to Vaillant anyway.

This one has the flat red vessel at the back, the one in the link does look easier to change.

[Lee]

Well that's that settled then :)

It's going in a convenient space in a storage cupboard - about 4m from the boiler. The CH pipes already run through said cupboard so should be straightforawrd...

[Lee]

Given the poor service life reported for two of the brands I looked at, this might not be a bad idea! :)

[Lee]

Thanks everyone.

[Jethro_uk]

Oops - forgot that one ! :)

Of course now it's got the cutoff, it will never need attention again. Like the taps I fitted 15 years ago.