I am looking to replace the boiler as part of a basement reno. The house was built in 1903 and has cast iron hot water radiators but we've done a fair amount of work to it, added insulation and have all new windows.
The current system is an old boiler from the 50s with hot a water tank. We have big old pipes in the basement which we are removing, which I've been told was because the system originally operated using gravity but has since had pumps added.
I have been given different opinions from different plumbers. One plumber thinks we should stick completely to the atmospheric system with hot water tank and would not put anything else. Another said we could using a wall hung condensing boiler with 4 zones, one for each floor including basement. This would be a little more expensive but means we could relocate the boiler away from the chimney because its side vented.
I'm not really worried about the cost, but want to choose the right setup for our house. Is there any reason to stick with the atmospheric over the higher efficiency condensing boiler?