Heat Storage, 1 large or many small tanks

Blofeld69 Posted By Blofeld69, Oct 4, 2013 at 5:05 PM

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  1. Blofeld69

    Blofeld69
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    Oct 1, 2013
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    Hello
    Hard to get a large tank where I am, I am wondering the advantages/disadvantages of having a large tank over having more smaller tanks connected together but same volume of water?
    Many thanks
     
  2. ewdudley

    ewdudley
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    I went with three 250 gallon propane tanks.

    They're short and skinny, so all three standing on end with insulation take up 4.5 ft wide x 9 ft long x 9 ft high, which makes a decent amount of storage, with a small, long and narrow footprint. With the room width available it worked out nicely, but of course most every situation will have its own optimum layout.

    Disadvantages include more fittings, more complicated piping, and more complicated rigging and millwright work to get them situated. Also it takes a fair amount more insulation (per gallon) to do a good job of insulating simply because the storage is less compact with multiple tanks.
     
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  3. stee6043

    stee6043
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    As EW mentioned above the plumbing expense can really add up on when adding more and more tanks. Shut offs and the like are not cheap!
     
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  4. arngnick

    arngnick
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    One tank if you can find one that you can move into the space you have for it. One tank will give better stratification but many small tanks will work well if set-up correctly.
     
  5. Blofeld69

    Blofeld69
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    Oct 1, 2013
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    I found a tank, about 5000 litre which is 1320 us gallons, what do you guys think? about 1000 us dollars. I thought this would be good as when not using it in the summer I could use it as a hot tub, tile it and deck the sides :)
     

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  6. kopeck

    kopeck
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    Is it Stainless steel? If it isn't you are going to have to line it some how. That being said it shouldn't be a huge deal to put a PVC liner in it but then you have to insulate it as well so you will have some money tied up...

    K
     
  7. Blofeld69

    Blofeld69
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  8. kopeck

    kopeck
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    I don't know of any paint that can take being submerged in 200 degree water for any amount of time. I guess you could drain and touch up every year or two...

    You will also have to use some sort of heat exchanger.

    K
     
  9. Blofeld69

    Blofeld69
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    or I found this one a lot cheaper. It was originally used for heating oil, the seller says its been cleaned and is rust free...would this work?
     

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  10. Blofeld69

    Blofeld69
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    I am in Europe and on a budget. This tank is 180 bucks
     
  11. hobbyheater

    hobbyheater
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    I have the plans for building your own soft tank , the plans are about 12 pages long so it will take 2 posts .
    If you want I will post them !
     
  12. Blofeld69

    Blofeld69
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  13. maple1

    maple1
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    Will this be for a pressurized or non-pressurized application?

    Big difference in the tank you'll need - and I don't think you've mentioned yet.

    (Either way stay away from oil tanks...)
     
  14. hobbyheater

    hobbyheater
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    pg 41.jpg
    pg 42.jpg

    pg 43.jpg
    pg 44.jpg

    pg 45.jpg pg 45.jpg
     

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  15. Blofeld69

    Blofeld69
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  16. hobbyheater

    hobbyheater
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    It has been recommended that pressure treated lumber be used,and stainless steel fasteners .
    Also today there are much better liners than EPDM , and I'm sure the company that I linked above would put you onto them.

    pg 46.jpg

    pg 47.jpg

    pg 48.jpg

    pg 49.jpg

    pg 50.jpg

    pg 51.jpg
     
  17. kopeck

    kopeck
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    Build your own tank/frame and then get the liner from Tom, that would keep the shipping down.

    What are you going to be using for exchangers?

    K
     
  18. Blofeld69

    Blofeld69
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    Oct 1, 2013
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    What do you guys think of a rubber tank? This is german made and 4600 litres so 1215 us gallons
     

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  19. peakbagger

    peakbagger
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    Most "rubber" tanks are synthetic and few are rated for high temperature. From personal experience even tanks rated for high temperature occasionally fail. There is a lot to be said for a welded PVC liner rated for the appropriate temperature. Unfortunately it may be hard to get in Europe as PVC is generally not recycleable.
     
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