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I live in a town house and my combi boiler is located on the ground floor. It is not a condenser and needs replacing. As condensing boilers create much more visible steam I want to replace the boiler with one where a vertical flue can be taken straight up a dry riser to exit through the roof...

Thanks all, to reassure you I'm not planning to go it myself, I had been told previously by a Corgi registered fitter that there was no way I could have such a long vertical flue, the length is very important as unless can vent it to above the roof Lin my neighbours (its a 1960s terrace) would...

What's the maximum vertical flue length I can have on a combo boiler? I want to install one in the downstairs of a three storey house, and ideally run a vertical flue straight up inside a dry riser surfaces above the roof line, so I need about a 22-25 foot flue. Will this work??