Which boiler for a long flue?

welshboy166 · 14 Feb 2011

We're refitting our house and have decided to locate our boiler on an internal wall (decision came down to kitchen design and more). This means that the flue would need to travel between 3.5 and 5m with a max of two bends in it (one to go horizontal to outside and then one to go vertical once outside if necessary). The boiler will need to power two bathrooms and the heating system. Can anyone recommend a brand of boilers that work well with this length of flue as I've only seen that Keston do flues of this length but have read on here that Keston are not the best brand?

Thanks in advance.

mickyg · 14 Feb 2011

Do not under any circumstances buy a Keston!

ATAG with 80mm twin flue works for me

mehran · 14 Feb 2011

intergas can have a 10m+ flue with a standard 60/100mm flue

Morris40 · 14 Feb 2011

Valliant will happily cope with that length of flue and much longer, and as stated before, DO NOT BUY KESTON

towan · 14 Feb 2011

most makes of boiler should be ok. looking at you longest lenght of 5 m with a meter for each bend, which gives a total lenght of 7 meters. Most boilers can go further than that.

kirkgas · 14 Feb 2011

if you intend to box the flue in it will require to have inspection hatches on it, from april 2012 might be worth remembering

Andygasman2010 · 14 Feb 2011

It it a combi you're looking for? If it's serving two bathrooms you may want to consider other options.

digdilem · 15 Feb 2011

Individual manuals will give max length, but remove 1m for each angle joint.

Mine's running for 8m with two angles up an inside wall into the loft and out through an end gable. Max run for this conventional Baxi is something like 12m twin tube. The sections are expensive (~£40 quid a meter, similar per elbow) but it allowed me to solve a tricky problem.

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Which boiler for a long flue?

Morris40

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