Our house was built 18 years ago and we have a BB in a small Sitting Room (also have an oil fired system). Now I'd like to swap out the BB and put in an inset stove and connect to heating system. However 2 plumbers who came to look at it for me are reluctant to do it. 1 told me that as the BB is very close to the Oil Boiler (the boiler is in the garage on the other side of the wall about 4 feet away from the BB) he wouldn't be sure of getting the levels of 1 to the other correct - the pump is between the 2. I'm not too technical and couldn't really debate this. The other plumber didn't want to touch the system as it's pressurised (had big problems in the early days with air in the rads). I'm not sure what to do and I'm looking for any advice I can get.