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What's the minimum height for an expansion tank in a non pressurized system?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by GS7, Nov 9, 2013.

  1. GS7

    GS7 Member

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    Is there a minimum height to hang a horizontal expansion tank in a non pressurized gasifier set up? Ceiling in boiler room is only 75inches. Boiler is 60 inches. Could never fit the 16 inch diameter expansion tank in between floor joist. Could the limited height risk performance in any way?

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  2. ewdudley

    ewdudley Minister of Fire

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    Don't understand you terminology. Non-pressurized and expansion tank don't usually go together.
  3. GS7

    GS7 Member

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    Ok I'll send you a pm
  4. Lapeer20m

    Lapeer20m Member

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    I built an owb that is non pressurized. without an expansion tank it would spew water out the overflow when it was hot. When it cooled down the boiler was no longer full to the top. I cannot answer the op's question, but in my case a put a 5 gallon tank with a vent directly on top of my boiler. This solved the problem for me.
  5. maple1

    maple1 Minister of Fire

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    My boiler manual specs 2.5 metres above the highest radiator in the system, for a vented expansion tank.
  6. GS7

    GS7 Member

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    If yours is directly on top and non pressurized as well, guess I should be ok
  7. Lapeer20m

    Lapeer20m Member

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    I suppose its also important to note that my boiler is the highest point in the system.

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