EPDM vs Rubber vs ...?

Chad Robinson Posted By Chad Robinson, Aug 26, 2012 at 10:19 PM

  1. Chad Robinson

    Chad Robinson
    New Member 2.

    Aug 20, 2012
    I hope I'm not revisiting an "old topic" but I'm about to build a plywood hot-water storage tank for my boiler, and I came across a vendor that sells pretty good-sized rubber sheets rated to 225F, which is higher than the EPDM ratings I'm seeing. http://www.rubbersheetroll.com/large_rubber_sheets.htm Does anybody have an opinion on using natural rubber for the tank liner?

    Also, I'd like to put in a fair bit of storage... I have the space just outside my basement under a deck with good access to build and install anything above-ground. I'm torn over whether it makes more sense to build two 500-gal (4'x8'x4' less inside isoboard insulation) tanks side by side and try to work out a stratification system (which honestly just sounds complicated to me - I'm not sure I'll pull it off properly) or just go for "build it bigger".

    I'm fairly confident I have the skill to pull off a robust enough construction to handle the weight and pressure. What I'm not sure of is whether heating all that water during the "shoulder season" would just make the whole thing a waste of time. I have plans to add radiant, but until I can afford that I have all hydronic baseboard. I was thinking that maybe two tanks would let me use a transfer pump or something like that to decide whether I want the second tank to be completely out of the loop. Then I can burn fewer times during mild weather mainly to satisfy DHW requirements.

    Thanks in advance,
  2. BoilerMan

    Minister of Fire 2.

    Apr 16, 2012
    Northern Maine

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