Woodburner kw output and flue diameter help

[adie.k]

stubby. don't want to rain on your parade friend, but no solid fuel burning appliance can run at 98%. you are well into condensing appliances at this efficiency and that just aint solid fuel. sorry - physics doesn't allow it. adie.k registered installer.

[Lukey-Loki]

hi.

there is nothing in the regs that says you have to have a liner. but if you are unsure of the condition of your chimney, it is always better to stick on the side of caution. as far as the insulation goes, the warmer you keep the flue gases, the less they will tar up your chimney and the quicker they move up and out. stops condensation in the chimney, so again, it would be prudent to do it.

if you have a modern house a 5 kw stove will be fine in a room of that size. anything over 5kw and you need an air vent.

the flue liner size should never be smaller than the collar on the stove and if the stove is half decent with a 5kw output, the fluesize will be 125mm dia. some installers put in a 6" flue but the building regs were changed to allow a stove to b fited under a 5" because of the increased efficiency of modern appliances.

 

hope this helps.

 

adie.k

 

 

Nice one adie. We were using the open fire last winter after we moved in but a couple of flats above us said they could smell smoke so we have to get the chimney lined whatever happens

 

By 'air vent' do you mean something specific that needs to go in the wall or are the air bricks that are already there adequate?

 

Luke.

[Stubby]

stubby. don't want to rain on your parade friend, but no solid fuel burning appliance can run at 98%. you are well into condensing appliances at this efficiency and that just aint solid fuel. sorry - physics doesn't allow it. adie.k registered installer.

 

Yea sorry if you check my last post I said I got my nine and eight round the wrong way ...typo .

[Alycidon]

Thank you guys for the helpful info. Much appreciated!

 

I'm waiting to see what maximum diameter of flue is possible (old 4 story house, we're in lower ground floor flat).

 

As to the air vent necessity - there are a couple of air bricks in the external wall (and cat flap). Are these sufficient or are the regs referring to something more specific?

 

OLD house would suggest that a liner is a wise choice, the cement in older properties breaks down between the bricks and allows smoke to penetrate. We had a situation just like that, ground floor flat insisted that we did not line due to cost, smoke penetrated an upper story flat due to crack in chimney, customer now cant use stove until they can afford to line the chimney, and its 4 stories so scaffolding needed as its far to high to safely install off ladders.

 

4 stories up plus maybe a loft area though will mean scaffolding or a cherry picker.

 

If the current air vents are permanently open and un closable then you may be ok, imagine a 22mm OD plumbing pipe, you will want one of those for each KW or part kw over 5.0 kw.

 

We usually put a 127mm core drill through the wall and insert a Stadium ventilator. That covers every stove we sell.

 

A

Edited March 12, 2013 by Alycidon

[mendiplogs]

Nice one Jon. I bet it's always toasty in your place.

 

HI LUKEY IT IS mate it needs to be as it -3 out there now 8.45pm :thumbup1:jon

[Lukey-Loki]

OLD house would suggest that a liner is a wise choice, the cement in older properties breaks down between the bricks and allows smoke to penetrate. We had a situation just like that, ground floor flat insisted that we did not line due to cost, smoke penetrated an upper story flat due to crack in chimney, customer now cant use stove until they can afford to line the chimney, and its 4 stories so scaffolding needed as its far to high to safely install off ladders.

 

4 stories up plus maybe a loft area though will mean scaffolding or a cherry picker.

 

If the current air vents are permanently open and un closable then you may be ok, imagine a 22mm OD plumbing pipe, you will want one of those for each KW or part kw over 5.0 kw.

 

We usually put a 127mm core drill through the wall and insert a Stadium ventilator. That covers every stove we sell.

 

A

 

Nice one. Thanks for the info.

Sounds like a very similar situation to us.

[Lukey-Loki]

HI LUKEY IT IS mate it needs to be as it -3 out there now 8.45pm :thumbup1:jon

 

Jealous here, Jon! Burning money at the moment. We've had to rely on the heating all winter as it's taken so long to get chimneys looked at!

Frustrating as there's a few ton of logs outside...

[mendiplogs]

Jealous here, Jon! Burning money at the moment. We've had to rely on the heating all winter as it's taken so long to get chimneys looked at!

Frustrating as there's a few ton of logs outside...

 

HI LUKEY our barn is old mate i think it better to go for a large stove on a old house mate i love ours going to put more logs on :thumbup1:jon