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Insulating Steam Return Lines

Al Letellier_9
Member Posts: 929
It's always best to insulate all the piping in a steam system. The purpose is to keep all the heat in the system where it belongs until it gets to the radiators. At the very least, all the piping above the water line should be insulated with 1" thick fiberglass pipe covering.
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Steam Return Lines
Thanks to your help, I've now insulated several feet of pipes emerging from my boiler(which were bare). Now I'm wondering about the steam return lines.
All the lines feeding the radiators are covered by asbestoes insulation in my 72-year-old house, but the return lines are bare. Is it advisable to cover them with fiberglass insulation or is it best to leave them alone?0
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