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I am involved in converting an old low pressure steam heating system to hot water. The intent is to reuse the existing cast iron radiators for the heating medium. The existing control valves and traps will be removed and a air vent will be installed. There will be a new non-electric control valve and balancing valve installed on each radiator. Is it better to connect the hot water supply to the bottom of the existing radiator or the top? Should the air vent be put on the radiator on the opposite side of the supply? Has anyone done such a conversation? If so, did you reuse the existing piping or provide new piping? How long did it take to flush out the existing cast iron radiators? At what temperature was the system set to operate, IE high side at 160 degrees? Low side at...? Was the water temperature reset based on outdoor air temperature, or did you find that keeping it at one temperature functioned better? What boiler manufacturer was chosen to be used in the system and why? I was considering a condensing type boiler with the intent of setting up the high side at 130-140 degrees and using a 30 temperature drop. Please feel free to comment and make suggestions. some of the questions contained here-in may sound stupid, but there are very few people out there any more that can talk cast iron rads, hot water heat and converting systems. Your help will be appreciated.