Malc
Must the new boiler be wm? I don't know the layout of your house, could you do floor standing in the old boilers place and flue out through the back of the chimney or is it an inside wall.
Pheat
Malc
I was under the impression that most oil boilers are more efficent than standard gas ones.
Are you aware that you should be OFTEC registered to work on oil boilers.
Also have you heard of vertex flue kits that will fit most ff boilers.
Regards
Pheat
