Conventional flue and chimney

[Frank McGuire]

I'm planning to instal an oil fired non-condensing combi boiler(Grant) in the kitchen of an old cottage. There's an existing, but disused fireplace in the kitchen and the chimney looks good. Is it enough just to fit a length of 4in flexible liner onto the boiler and route it up the chimney, with the boiler taking its air from the kitchen?

I take it I can't use a balanced flue discharging into the fireplace!

[Weatherlawyer]

You need to line the whole stack with that stuff. Climb up and clear it out if necessary, then drop the liner in. (I think.)

[The Natural Philosopher]

If the property is pre 1970 (IIRC) this is acceptable to the regulations..otherwise you may need to use a better flue liner.

if the BCO is involved he will check for ventilation *into* the room.

generally a 4" hole with a 'hit and miss' vent over it will be enough.