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Married Heating Separately or Jointly
My friend has a two story house consisting of three apartments heated by three separate boilers. Each apt/boiler is piped independent of the other and has it's own meter. They each provide domestic hot water and radiant tile floors. He is changing out the boilers and is adamant on getting three new combi mod. condensing. Is there any benefit to piping the boilers into one primary loop? They would still have separate meters. I've been pondering :
A) variable primary
B)cascading a primary loop on outdoor reset and each apt would be secondary pumped zone.
Can I do this and would it be fair to all the tenants?