Chimney Liner

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Chimney Liner

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BDI

Joined: 21 Oct 2012
Posts: 4

Posted: Sun Oct 21, 12 12:55 pm Post subject: Chimney Liner
Help Please, My chimney has a liner fitted and has a fitted gas fire, we want to fit a multifuel stove but have been told that the liner needs replacing with one suitable for the multifuel stove ??? Is this correct HELP

mochyn

Joined: 21 Dec 2004
Posts: 24585
Location: mid-Wales

Posted: Sun Oct 21, 12 1:00 pm Post subject:
Hello BDI and welcome. I think that's proably true, but someone more knowledgeable will be along soon!

sally_in_wales
Downsizer Moderator

Joined: 06 Mar 2005
Posts: 20809
Location: sunny wales

Posted: Sun Oct 21, 12 1:15 pm Post subject:
I know the regs were tightened up just after we fitted our fire a fair few years back. At the time, we were ok running a small woodburner flue part way up our fairly huge chimney but not lining the whole thing, almost immediately after we fitted ours, things changed so that if we were fitting the same fire now we'd have to run a liner all the way up.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Sun Oct 21, 12 2:25 pm Post subject:
Gas flues are different to those which need to deal with wood or coal. Gas is far less corrosive, you'd be best advised by a qualified HETAS engineer.

Gervase

Joined: 17 Nov 2004
Posts: 8655

Posted: Sun Oct 21, 12 3:05 pm Post subject:

Part J of the Building Regs covers flues and chimneys, and HETAS is the government-approved body which oversees them. Get a HETAS-approved engineer in to look at your specific case if you are remotely uncertain.
On a more general note, however, nearly all gas flues are single-skinned, and should never be used with a solid-fuel stove. If you have a single-skinned liner you will have to replace it with a double-walled liner - ideally in stainless steel. That may sound like an expensive bore, but it could save your life; a single-skinned flue will quickly corrode, allowing colourless and odourless carbon monoxide gas to escape.
When it comes to choosing liners, stoves etc, I have found these people to be cheap and reliable. They also have advice on what to fit and how on the website. Beware of buying lengths of lining on eBay.

BDI

Joined: 21 Oct 2012
Posts: 4

Posted: Sun Oct 21, 12 3:28 pm Post subject:
Thank you all for your help, it looks like im going to have to get the professionals in to look at this.

dpack

Joined: 02 Jul 2005
Posts: 46211
Location: yes

Posted: Sun Oct 21, 12 3:29 pm Post subject:
thanks gervase ,clearly put ,my next task is liner the linky looks very helpful

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sun Oct 21, 12 4:07 pm Post subject:

Gervase wrote:

On a more general note, however, nearly all gas flues are single-skinned, and should never be used with a solid-fuel stove... a single-skinned flue will quickly corrode, allowing colourless and odourless carbon monoxide gas to escape.

That said, I've known people burn wood & coal through a gas flue for years, and the only problem they had was that it seems to fur up rather quickly.
If you take that risk, then buy a carbon monoxide detector.

Gervase

Joined: 17 Nov 2004
Posts: 8655

Posted: Mon Oct 22, 12 6:51 am Post subject:
And I've known people to drink scalding coffee while texting while driving. Just because it is done doesn't mean it should be done. Particularly if there is any danger to life.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Mon Oct 22, 12 7:51 am Post subject:
Many things present a danger to life. You do the risk assessment and make an informed decision.

dpack

Joined: 02 Jul 2005
Posts: 46211
Location: yes

Posted: Mon Oct 22, 12 11:00 am Post subject:
i have burnt through gas flue tube a couple of times with hobo stoves tis very thin ,i wouldnt consider it for a house chimney

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Oct 23, 12 8:43 am Post subject:

dpack wrote:

i have burnt through gas flue tube a couple of times with hobo stoves

tis very thin ,i wouldnt consider it for a house chimney

You would certainly want a bit of steel at the bottom.

I am not suggesting that gas flue is a good idea, only that if it is all you've got, then with the addition of a carbon monoxide detector and a healthy dose of caution, then it is probably a better idea than freezing.

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Tue Oct 23, 12 9:01 am Post subject:
I would never contemplate fitting a wood burner to a gas flue. It's unsafe, gives the householder a false sense of security, and is easily damaged by brushing. If the flue itself is in serviceable condition then it's far better to remove the gas liner and connect directly to the flue.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Tue Oct 23, 12 9:12 am Post subject:

vegplot wrote:

If the flue itself is in serviceable condition then it's far better to remove the gas liner and connect directly to the flue.

Why is that?

vegplot

Joined: 19 Apr 2007
Posts: 21301
Location: Bethesda, Gwynedd

Posted: Tue Oct 23, 12 9:37 am Post subject:
Because you can ensure the integrity of the system which you can't do with a gas liner due to the reasons stated.

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