We just moved into a new house, well an old house to be technically correct. The gas boiler is an old Potterton and it's an open system with a hot water cylinder and a tank in the loft. We are thinking of replacing this with a combi and simply cannot decide whether it's worth doing this. Some gas engineers noticed that we have microball downstairs and 15 mm upstairs so they are saying that 99% it will work but there is that 1% chance that they may need to drop pipes in the corners to replace the microball downstairs.
So provided that it works what are pros and cons of the two systems? I have read the description and it is really good. However it does not provide any decision making information.
The two things I can think of are reclaim the space taken up by the hot water cylinder and the tank in the loft and also all the pipes, the noise that it makes when in use.
Any other thoughts?