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New House 2 plumbing systems

philrg Member Posts: 1
Just buying an old (1930's) house that has two boilers and heating systems. One is a multi-zone hydronic system with gas boiler that heats about 70% of house. the other is a ducted forced air oil furnace. Both the boiler and furnace need replacing. The house does not have central AC. Aside from switching to an all gas system, what else would people recommend considering? Thanks!


    STEAM DOCTOR Member Posts: 2,001
  • Zman
    Zman Member Posts: 7,572
    What would it take to convert the 30% to hot water and install 1 boiler?
    A good question for the installer is "how you determine the proper boiler size?". If his answer has anything to do with what size is existing, what his dad and granddad did or any rule having to do with thumbs, keep looking....
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • mikeg2015
    mikeg2015 Member Posts: 1,194
    Would definitely convert the smaller unit to hydronic. A no brained. Just adding 1 more zone. But need to do some calculations and get it installed right. For comfort, use a variable speed hydronic AHU and use 2 stages for the blower. WIll probably be able to use the lowest 90% of the time. Would allow outdoor reset as well.