fourth year
The radiators will have to have the outlet bushings removed and full sized ones installed. You can either replace the return piping with a reverse loop hot water return, or replace the entire system with a single pipe Mono-Flo design. The radiators will have to have hot water air vents located at the top of the radiators and the steam vents, which are half way down the radiator will have to be removed and the openings plugged. You may want to replace the steam radiator valves with hot water valves, but it is not absolutely necessary. The boiler will have to be outfitted with the complete line of devices, i.e. Flo-control valve, compression tank, air eliminator, pump, burner controls, etc.
