Valliant pure rear flue

king of pipes · Oct 21, 2019

Anyone fitted these problem I am finding is it does not close down enough for the thickness of the wall and cannot be cut they are not the same as a normal horizontal flue , phoned Valliant technical they said it is what it is not alot of help. Kop

Scott_D · Oct 21, 2019

I have only fitted one
The white inner was just poking outside, i think the wall was 280mm thick and I had to extend the black part out past the eves so had to add a bracket. Wasnt easy to fit.

EvilDrPorkChop · Oct 21, 2019

king of pipes said:
Anyone fitted these problem I am finding is it does not close down enough for the thickness of the wall and cannot be cut they are not the same as a normal horizontal flue , phoned Valliant technical they said it is what it is not alot of help. Kop

Yeah they're rubbish. Had exactly the same problem, first one I did I took back and swapped. Just use a normal horizontal flue and cut down as required....They say allow 24-28mm on the bracket side, however I find that 28mm can be touch and go. I usually allow 32mm and have no issues. Usually easiest pushing flue through, setting up and marking it on the side when the bracket is on the wall.

Make sure you silicone grease the sockets up plenty on back of boiler for when you hang it makes it easier.

Harvest Fields · Oct 21, 2019

Have also been told to avoid these. Not had the pleasure of one before. I always use standard and cut to size. Does it screw to the rear flue port like the standard?

king of pipes · Oct 22, 2019

I was told I couldn't use a standard flue under 550mm because of the turbulace it would cause in the flue ? I only had 328mm, the joint where the two telescopic ends when fully inserted needs tapeing and screwing I could just see the joint didn't see any white showing the wall weathering collar is pony and I am not going to use that I have a rubber type one which is slightly wider and it will cover the taped joint and weather proof the joint against the wall , I have to tooth out the wall as the original boiler was a balanced flue , on the whole bit of a faf but got it now so will get it done as MI will post once completed. Cheers kop
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Harvest Fields said:
Have also been told to avoid these. Not had the pleasure of one before. I always use standard and cut to size. Does it screw to the rear flue port like the standard?

No mate it is screwed to the wall bracket fixed at 24 - 28 mm protruding , the boiler hangs on the bracket and the weight of the boiler helps insert the it into rear flue spigot .

EvilDrPorkChop · Oct 22, 2019

king of pipes said:
I was told I couldn't use a standard flue under 550mm because of the turbulace it would cause in the flue ? I only had 328mm, the joint where the two telescopic ends when fully inserted needs tapeing and screwing I could just see the joint didn't see any white showing the wall weathering collar is pony and I am not going to use that I have a rubber type one which is slightly wider and it will cover the taped joint and weather proof the joint against the wall , I have to tooth out the wall as the original boiler was a balanced flue , on the whole bit of a faf but got it now so will get it done as MI will post once completed. Cheers kop
[automerge]1571723965[/automerge]

No mate it is screwed to the wall bracket fixed at 24 - 28 mm protruding , the boiler hangs on the bracket and the weight of the boiler helps insert the it into rear flue spigot .

The MI flue instructions say you can use the standard flue if the rear one isn’t suitable.

king of pipes · Oct 22, 2019

Not what technical support told me bud don't shoot the messenger

nowhere does it say use a horizontal standard flue only ducts for extensions . Cheers kop
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That circled bit is not clear ? Opions gents

EvilDrPorkChop · Oct 22, 2019

king of pipes said:
Not what technical support told me bud don't shoot the messenger nowhere does it say use a horizontal standard flue only ducts for extensions . Cheers kop
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That circled bit is not clear ? Opions gents

That's for the Telescopic one mate, there's something somewhere that states if you cannot achieve the minimum length for the rear telescopic flue it's acceptable to use the standard horizontal flue and cut it down. I've read it somewhere before. Just had a quick skim through and can't see it, although the books aren't always the best reading material.
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Sorry, it's been a long day - it says on there

Do not shorten the telescopic flue pipe. If the required pipe length cannot be achieved, use extensions or the horizontal wall/roof duct.

Your screenshot got cut off on the forum picture.

Thought i'd seen it somewhere 😂

Christopher buzzard · Oct 22, 2019

Had this issue with a glow worm energy where the rear flue would stick out to far and couldn’t be cut. Rang technical and they told me to use a standard horizontal and cut to required length.

king of pipes · Oct 22, 2019

Gonna ring em again tomorrow to check cheers chaps .
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Update I couldn't leave it as it was so checked with Valliant got some one different in technical and not a problem to use a horizontal flue cut down grrrr lesson learned chaps . Cheers kop

Harvest Fields · Oct 23, 2019

Love it when a proper job is done mate. Got one myself to key In at some stage. Looks good

king of pipes · Oct 25, 2019

Done and dusted an early day for me Feeling rough with a head cold 🥵 , have a good weekend chaps

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Valliant pure rear flue

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