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one pipe steam or two pipe hot water
Wow! I just discovered this forum.
I have recently purchased an old house originally horizontal return coal fed boiler, one pipe steam heat. This boiler was abandoned - possible in working order.
A "new" LP boiler replaced it. 400,000 btu in, 320,000 out. I have not turned this on. Recently, as I began inspecting the sight glass and water level controls, I discovered a lot of mud -- Boiler not cared for.
I have three phase delta available outside my wall as the former owners were about to replace everything with electric heat.
The electric company has a "Storage" rate that is nearly one third the regular rate. Similar to off-peak, "Storage" is where the electric is on at certain times each day, the energy is stored as heat then used during the day when the electricity is not available. The current storage systems uses ceramics to store heat, but I have all the parts available to store heat in water. 400 gallons of water is nearly 3 million btu at 5 lbs of pressure.
Some of the piping is damaged. Most of the radiators are intact. While wondering how much work it is to convert to a two pipe system, I came across some of your threads. Informative.
My goal is to determine the most efficient system to heat the house. Obviously, this boiler looses 20% before getting into any of the rooms.
I am inclined to use a water "storage" at 215 degrees, a three way valve to mix water with temperature varying from 100 to 212 depending on outside temperature and convert the radiators to a two pipe hot water system. I am looking at using this storage for the first 60% and a (the) LP boiler as backup. What are your thoughts?