8m long boiler flue in void with no room for slope back

[Michaelb]

I am trying to replace an existing non condensing boiler which has an 8m long truly horizontal flue which runs in a 90mm tall ceiling void.

The Installer proposal is to use a Keston System 30 condensing boiler with dual 50mm plastic flues with only 2 joints since they come in 4m lengths. This meets the need of fitting the flue into the void HOWEVER it means there is not enough space to get required 1.5 degree slope back to the boiler which would need a drop of 26mm drop per meter. Installer says this will be OK. Lowering the ceilings is not an option at this point.

Is there really a need for a slope back in the flue pipe? If its properly sealed at the joints and supported and clipped along the way to reduce the chance of leaking and sagging pipes, is that enough?

The other option would be to fit a Vokera Mynute 24SE non condensing boiler with twin 80mm flues (I think we have enough points to permit this). This still has a specification of a 1.0 degree slope back, but once again, since its non condensing, would the lack of the full slope cause a problem since the condensate should be little or none.

Any other ideas ?

 

[Mike Jackson]

The flue must be installed to the manufacturers specification.

 

[IDCHAPPY]

Seen so many shonkey flues fitted and big patches forming on the ceiling because of it.
Can you not extend the boxing to give the flue the desired run or move it to an external wall?

 

[townfanjon]

mods !! maybe

 

[Killy Bing]

There is a good reason for having fall.....

move said boiler?

or heaven forbid route the flue and box it in....

 

[LPC]

Get the Gas Safe engineer you employ to install it to work all of this out for you.

 

[Ermintrude]

Done a few jobs like this, your options are as follows

1. No boiler
2. Small boxing
3.move boiler.


With only 90mm you won't get keston flue, clip and inspection hatch. Thrust me!

 

[kirkgas]

Too much gas advice being given to a customer on fitting a boiler, however what I will say to the OP is to get a gas safe engineer who cares about doing a decent job in to sort out the options

 

[Nostrum]

Thrust me!

Steady on!

 

[Ermintrude]

I'm a doctor

 

[Michaelb]

Understand. The person doing the talking is the contracting builder rather then the Gas Safe Engineer.

 

[Ermintrude]

In other helpful hints bronze tap suggests using a bit of wire from the end of your stick to the work piece when your stick welding to eliminate the need to strike the arc.

Also don't buy an auto dim visor just keep one eye closed and only open it when u have a run, just use the normal eye for tacks.

Cropper must be watching borat or anchorman.

 

[Dotty]

As there are members who clearly have not read the forum rules nor any mi's at all, this thread is now closed.