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I have a 90+ year old converted 2 family house that is now 4 @ 1 bedroom apartments, 2 up, 2 down. The single pipe steam system has two headers, one to the front and one to the rear. The entire system is controlled by 1 thermostat in the downstairs front living room. I read the article about zoning, but it seems to be for a much larger building. Is there any successful way to split the system to 2 or 4 zones?