I have a Vokera combi boiler that's a few years old and gets serviced once a year.

Sorry, I should have said hello first. New to this forum.

My problem: for a few years now water drips from the flue, sometimes not always. It's rusty in colour and leaves a horrible rusty mark on the roughcast. The flue is bent inward, ie curved round to face the wall. Overtime the roughcast has become damaged and needs repaired. When we asked the engineer about the dripping he replied, it's supposed to drip.

Can anything be done to prevent this?

Thank you for any help or advice given.

Hi Alburly



I think the guys will want to see a picture of that. Sounds rather unusual

Make and model of the boiler would be a good plan as well as a pic of the flue.

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Hi Alburly,

Are you sure it's the flue and not just the overflow pipe?

Sounds like the prv outlet to me and no it should not be dripping.

The flue will be the large 4" pipe off the top of the boiler and can't imagine this ever turned back towards the wall

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Dave

www.drlgas.co.uk

Oops sorry guys. It must be the overflow pipe/outlet that's bent inward towards the wall. Sorry for the confusion. It's roughly about 20-25mm in diameter. The wall is stained with a rusty water mark and has caused damage to the roughcast. Is there anyway in which this can be prevented?

Many thanks for your replies and advice.

That will indicate a fault with the PRV or more likely the expansion vessel, or filler.

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Many thanks for your advice. The service engineer came out yesterday and said that it's supposed to do that? hmm!

The problem is that it's damaging the rough casting, as the boiler overflow is upstairs in the house. Is there anyway in which the overflow could be extended? I was thinking of bringing a pipe up and over the overflow. This would take the rusty water down and away from the rough casting. If this is possible, what is the best type of pipe to use?

Thank you once again for your advice.

Can you post a pic please, without the info I would say the service engineer is talking absolute poppycock

Edited by Mod 6

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Thanks for your reply the scruff.

Please find attached a photo of the overflow and rusty water mark. The water mark is actually worse than what's shown due to the photo limitations.

Thank you once again for your help!

What is it connected too the other side, it looks like the pressure relief valve is leaking.

How high does the pressure rise to when the boiler is running, and do you have to keep topping the pressure up.

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Many thanks for your help and replies. I'm afraid I haven't got a clue about boilers. I don't want to go messing about with them either.

In laymans terms, do you think something is wrong?

Would it be possible to extend the overflow down to prevent the brown water ruining the roughcast? For example, a pipe brought down the wall to take away the brown dirty water.

Thank you for your help and advice once again.

It shouldn't leak or drip at all

All Scruff asked you to do was see what the pressure guage on the boiler reads when it's cold and then check again when the systems been on for 20 minutes then tell us what you see

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If it is (and I suspect that it is) the PRV overflow, then it's in the regulations that it has to be turned into the wall (or run very close to the ground) Stops anyone getting blasted with boiling hot water should it operate due to too much pressure.

Thanks for all your help and advice.

A couple of questions to put this to bed please!

Why is the water brown?

And if the brown water problem can't be fixed. Can the overflow be extended down the wall by using a pipe to take away the dirty water from the wall?

Finally, what type of pipe (material) and fittings could be used? If it's ever been done before?

Thank you.