Boiler recommendation

[s--p--o--n--i--x]

A friend wants a combi boiler which he plans to have installed in the airing cuboard.

The only way for the outlet flue is straight up and out through the roof, a distance of ten or fifteen feet. The air inlet pipe may be a problem. This may either have to be routed up through the roof or alternatively horizontally and out through a side wall.

Most boilers are wall hung jobbies that vent straight through the wall via a co-axial duct.. Can anyone suggest a range of boilers that allow seperate intake and outlet flues going in different directions?

sponix

[Doctor Evil]

Not so. Most boilers, if not all, can have extended flues right up through the roof. Many can convert from concentric flues to two pipe jobs. Some supply a roof ridge tile for the purpose. It is a case of looking at the boilers in the price range and getting the tech info. The Keston Celsius uses plastic waste pipe, so flue extensions then can be very cheap. The boiler is expensive, but a cheap flue. Extended concentric flues are expensive for long lengths and elbows (45 and 90 degrees). So, a cheap boiler may end up more expensive than a Keston.

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[Andy Hall]

The Keston Celsius has this as standard and the MAN Micromat has it as an option by the use of a flue adaptor that converts the concentric flue adaptor to twin 50mm.

There are almost certainly a number more that can have this option.

The flue is then 50mm muPVC high temperature waste pipe which is relatively cheap and can run for typically 10-20m or more and with intake in different place to outlet.

Many boilers can also have the option of a long concentric flue rising vertically. Pretty much all German models have this because it is a very common method of installation in Germany.

[Bernie Ecclescake]

Why in the name of god would you not use a coax flue routed to an outside wall (or indeed out through the roof) Ten or fifteen feet of flue is nothing!

[Ed Sirett]

Whilst the over whelming majority of modern room-sealed fan-assisted wall hung gas boilers are fitted in a kitchen on an outside wall, when this is not the case then a flue/duct system that is versatile is a great help. The cost of less common flue accessories from many manufacturers is often substantial. (Eg. standard flue up to 1m, terminal, one bend and fixing kit = £30 v. 1 pair of 45deg bends = £70.)

As for different directions, this is partially forbidden in that opposite side of a building are not allowed. Typically the route for both inlet and outlet is substantially the same. Although plume and condensate considerations may make for alterations.

HTH

[s--p--o--n--i--x]

A friend wants a combi boiler which he plans to have installed in the airing cuboard.

The only way for the outlet flue is straight up and out through the roof, a distance of ten or fifteen feet. The air inlet pipe may be a problem. This may either have to be routed up through the roof or alternatively horizontally and out through a side wall.

Most boilers are wall hung jobbies that vent straight through the wall via a co-axial duct.. Can anyone suggest a range of boilers that allow seperate intake and outlet flues going in different directions?

sponix

[Doctor Evil]

Deja-vu

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[--s-p-o-n-i-x--]

On Wed, 25 May 2005 18:09:05 +0100, Bernie Ecclescake wrote: the

Because there is already a vertical flue in place and it'd be nice to reuse it if possible, to minimise work.

That leaves an air intake. Yes, it would be nice to bring this down from the roof but is more complicated than bringing it in from an outside wall.

Therfore the exhaust needs to go vertically and the intake horizontally.

sponix

[Ed Sirett]

It should be possible to find some boiler types as you need. If the existing flue is straight and more than 100mm internal you should also be able to use a vertical co-ax flue. _Provided you can support it properly._

-- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at

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