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Underground Storage tank

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by SIERRADMAX, Nov 1, 2012.


    SIERRADMAX Feeling the Heat

    Jan 13, 2011
    My uncle and I are on the wood boiler train. He purchased a Harman wood/coal boiler and I'm still shopping around. I'm more internet savy so I thought I'd ask around. He's in the midst of plumbing his as a suppliment to an oil boiler. I had mentioned the benefits of adding storage and how this can be achieved with a propane tank. Luckily, he has a friend in the propane business so we can get our hands on 1 or 2. He came up with the idea of burrying a tank under a patio slab outside. His method of constructing would be to encapsulate the tank in thick poly sheathing, sprayfoam the tank and surround with EPS or ISO insulation. I've yet to come across a thread for underground storage so I don't know if its a good idea or not.

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  2. buddylee

    buddylee Member

    Feb 16, 2011
    middle georgia
    Saw one on here where someone used a new septic tank. Insulated and water proofed it. Looked like a great idea.
  3. Floydian

    Floydian Feeling the Heat

    Dec 12, 2008
    Southwestern VA

    Here is some reading for you.

    I don't like the idea one bit, but thats just me. 24/7 heat loss to the ground,not so accessible fittings, settling and shifting potential,etc. The benefits don't seem to out way the risks.
    If you do go this rout the ONLY insulation to consider IMHO, would be a meticulous application of at least 6"-8" of 2 lb closed cell urethane spray foam. Yup, the expensive stuff.
    Poly ISO is not suitable for exterior below grade applications, it will become water logged.

    I think I'd sooner roll without storage than attempt this. Which leads to this question: what kind of supply water temps does your heat distributions system require?

    Hope this helps in some way,
  4. tom in maine

    tom in maine Minister of Fire

    Apr 4, 2008
    Searsport, Maine
    This thread recurs about once a year.
    Floydian is absolutely correct that the foam will waterlog. It is subject to the surrounding soils as to how much.
    A more significant issue is access for service and corrosion.
    Put up a small building if you do not have the space in the house.
    You have to plan for servicing something, sometime!

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