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Help sizing baseboards, new install old house.
Hi, I hope I am posting this question in the right place. I own a house that currently has steam heat. I have a basement, 1st, 2nd, and soon to be 3rd floor. My third floor currently is an attic that will be turned in to a master suite. My steam system is working pretty well but I really want to change everything over to forced hot water/baseboard for the following reasons. First, I have a finished basement and the steam pipes in the basement make it unbearably hot in the winter. My wife is a personal trainer and we have a gym downstairs for her and her clients. Opening the windows down there does not help. Second, since I am doing an addition I really want my own zone for heating and cooling on the third floor which I just can't do with steam. So I figured I can kill two birds with one stone. If I ditch the steam system I can run oxygen barrier pex and have each floor be on its own zone with its own circulator pump. I have been planning out the best way to run the pipes while opening as few walls as possible. Here in lies the question, 1, I have a few steam pipes which are going from the boiler room straight up to the 2nd floor, is it ok if I cut the pipe with a Sawzall on the bottom and top of it and use it as a conduit for my pex so I don't have to open the drywall on each level to drill holes in the bottom and top plates? I plan on sending two pipes through it (supply and return). And the next question I have is how do I size my baseboards per room of the house? I understand that with a series configuration, the last baseboard on each zone tends to get much colder water than the first in the zone, are there any piping configurations that would eliminate this, short of hooking everything up in parallel? I saw a pass through valve with a dial that can be sweat soldered to each baseboard which can change how much water each baseboard gets but I can't seem to find the correct part that I need. As an example, my living room on the first floor is 32.5 feet long x 13.5 feet wide x 8 feet high.
I'm very worried about installing all the baseboards only to find out that I either under, or oversized the baseboards while having the last baseboard in the loop not give off enough heat.
Any help would be greatly appreciated, thank you!
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