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Oil Fired combi boiler?

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TdiGuy
TdiGuy Member Posts: 3
in Oil Heating

I have been looking around trying to find a combi boiler system that is oil fired to replace my current hydronic heating system that includes a tankless coil for hot water. I see plenty of solutions that are natural gas and or propane, for me that represents a significant cost to pipe in a propane bottle since the existing oil tank is in the basement. That and my wife is strongly opposed to any propane.

Maybe my presumptions are also incorrect but i would believe a combi unit would be more efficient than my current setup especially for hot water. I also use mini splits for heat most of the time now since i have gone solar for power.

Comments

  • GGross
    GGross Member Posts: 1,969

    They make oil fired boilers with tankless coils in them, they are quite common try searching for "oil fired boiler with tankless coil" instead of "combi" since even though combi is a correct term it is more often used for mod/con combi boilers so that is probably what comes up the most with that as a search term

  • Jamie Hall
    Jamie Hall Member Posts: 27,579

    Actually what you have is pretty good — a quality modern oil boiler firing a hydronic system. The downside is keeping the boiler warm for the domestic hot water. You might gain some efficiency by using an indirect hot water heater, such as a SuperStor, heated by the boiler but storing a good deal of hot water, like a regular hot water heater. It works like a separate zone off the existing hot water heat.

    What you will NOT find is an oil fired "combi" in the modern usage of the word — which also implies "mod/con" — that is modulating. Those do have slightly higher rated efficiencies, true — but they are only for LP or natural gas, as modulating an oil burner is really remarkably hard and there isn't that much to be gained anyway (oil is naturally more efficient that either LP or gas under otherwise identical conditions).

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    TdiGuyGGross
  • TdiGuy
    TdiGuy Member Posts: 3
    https://forum.heatinghelp.com/discussion/comment/1898897#Comment_1898897

    Thank you, not sure i want to go the route of adding a tank to the system with decreasing how much i use the system for heating the home. It does sip oil when it comes to using the system for hot water only, in the summer i only use maybe 50-60 gallons between spring and summer. Maybe i am just looking for savings that might not really exist these fuel prices are killing me.

  • HVACNUT
    HVACNUT Member Posts: 7,525

    @TdiGuy

    Screenshot_20260619_141615_My Files.jpg
    Robert O'BrienGGross

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