Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Pipe sizes for radiator panel heating
Good morning everyone,
I’m currently renovating one of my units in a 4 unit building and would like to slowly begin the process of switching to a centralized heating system. It’s a 1920 building and each unit is overall roughly 24x28 while the sub level unit is a bit smaller to allow for a utility room which the new heater will be housed. I have all the tools needed to do the plumbing but can’t get any definitive answers on pipe sizes. The system will be a high efficiency condensing unit running at 140 degrees to 4 panels in each unit with a thermostat controlled valve for each unit. I understand most of you will just say to hire the proper contractor but I’m not installing the entire system now just the sections that I can while I have the ceiling open for renovation in one of the units. My thoughts were to run 1” pex from a main that runs the 3 levels and then branch off with either 3/4 or 1/2 to each radiator and back to another 1” return to the main return. The feed and return pipes that run up through the building I would like to use the iron pipe but not sure if what size to feed the building. I would assume at least 1 1/4 if not more. I’m not hooking up any gas or electric or anything dangerous simply doing some plumbing here to get it ready as I renovate units. Any input on pipe sizes would be greatly appreciated