Can you install a gas boiler under the stairs these days ??

13 Mar 2008
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United Kingdom
The house we recently moved into has an 11-yr old gas-fired Irish AGA-style cooker (a Stanley) that also runs the hot water & central heating but is very temperamental. We prefer a normal electric oven anyway so intend to do away with the Stanley and have a "normal" boiler (probably 100k BTU, as per the Stanley) installed for the heating & water.

The Stanley vents through a tall vertical metal flue (150mm diameter, approx 8-9m tall) that runs up the middle of the house inside an old chimney stack and out through the roof. I had assumed that the obvious place to install the new boiler would be under the stairs, behind where the Stanley now sits, and utilising the same flue.

However a local plumber told me he didn't think that modern gas boilers can be fitted in such a location, instead that they should go on an outside wall with a short horizontal flue. Whilst I can possibly achieve this by putting the boiler in the downstairs WC, this is much more intrusive.

Can anyone confirm whether the local plumber is correct ? Specifically, is there a quality boiler solution that would work OK fitted under the stairs and using the existing tall vertical metal flue used by the Stanley ?

Any guidance much appreciated !!
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There are a few solutions available if unable to fit on an outside wall but basically, yes, he was correct.

Old Flues should be replaced on new appliances and O/F boilers cannot be fitted anymore

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