Hello,

I am researching flues for my new boiler. I understand that a
conventional flue is the "exhaust" from the boiler and that it has to
draw the air it needs from the room its in, whereas a balanced flue
has an air intake as well as an air outlet built-in.

But I cannot work out what high level and low level flues are. Can
anyone enlighten me?

Thanks,
Stephen.

Stephen wrote:

But I cannot work out what high level and low level flues are. Can
anyone enlighten me?

Low level are those fitted to floor standing boilers and through wall
flued gas fires. Usually a large square section cage (12" ish) that
sticks through the wall - flue gasses come out a centre part of it, air
goes in the surround, that there a grill over the whole thing to stop
you getting too close.

High level are designed to discharge overhead - i.e. higher up a wall or
through a roof etc. These are usually smaller neater concentric 4" pipes
with a spout on the end.

--
Cheers,

John.

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On Sat, 09 Aug 2008 18:36:12 +0000, Stephen wrote:

Hello,

I am researching flues for my new boiler. I understand that a
conventional flue is the "exhaust" from the boiler and that it has to
draw the air it needs from the room its in, whereas a balanced flue has
an air intake as well as an air outlet built-in.

But I cannot work out what high level and low level flues are. Can
anyone enlighten me?

Thanks,
Stephen.

Almost all modern boilers use 60mm in 100mm concentric flue/air-duct.
Perhaps if you would like to shed some light on some of your thinking that
has led you to this point then someone can give you much better advice.

You might find some of the FAQs below relevant.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

On Sat, 09 Aug 2008 19:57:03 +0100, John Rumm
wrote:

Low level are those fitted to floor standing boilers and through wall
flued gas fires. Usually a large square section cage (12" ish) that
sticks through the wall - flue gasses come out a centre part of it, air
goes in the surround, that there a grill over the whole thing to stop
you getting too close.

High level are designed to discharge overhead - i.e. higher up a wall or
through a roof etc. These are usually smaller neater concentric 4" pipes
with a spout on the end.

Thanks for explaining. To answer Ed's post, I am reading the faqs
thanks for the urls. I had been reading the Grand flue brochure which
is where I had seen the range of conventional, balanced, low- and
high- level flues.