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Thread: Modcon buffer tank temperature

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  1. #1
    DIY Member Buffalobillpatrick's Avatar
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    Default Modcon buffer tank temperature

    I'm planning new Buffer-centric system. Modcon, slab, & 120 gal. Buffer tank.

    Should buffer tank temperature be controlled by ODR, with Modcon set to continuous call for heat
    OR
    Aqustat on buffer tank 90 -> 110* controlling boiler, with thermostatic 3-way valve limiting water to floor 90*

    BBP

  2. #2
    In the trades Dana's Avatar
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    What's the point of the buffer if you have high mass concrete slab radiation?

  3. #3
    Master Hot Water Mpls,MN BadgerBoilerMN's Avatar
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    Buffer-centric system? That's a new one.

    The design water temperature for any hydronic heating system, but more especially for a radiant floor heating system is determined by the heat load and the type of radiant panel you are using. I design radiant floor heating systems driven by condensing boilers every day and have only used on a handful of a buffer installations - usually to correct another's mistakes. Reading Siegenthaler's books again are we?

  4. #4
    In the trades Dana's Avatar
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    I can't imagine any slab-radiant system no matter how micro-zoned that would require any kind of buffer, let alone 1000lbs of water. It's useful to have a calculator handy (and actually use it) when reading "Hydronics for Dogs" or whatever, eh? ;-)

  5. #5
    Master Hot Water Mpls,MN BadgerBoilerMN's Avatar
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    Well, if you boiler is twice too big for the application and is bumping off the bottom, but then you're in a whole other world of hurt. Perhaps our mountain man has solar heating in mind?

  6. #6
    DIY Member Buffalobillpatrick's Avatar
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    I still need some input related to my question.
    Thanks

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