Help with how to plumb wood heat into this system

Eureka Posted By Eureka, Oct 3, 2018 at 11:16 PM

  1. Dutchie84

    Dutchie84
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    And I don't think you need that second exp tank by the HX.
     
  2. maple1

    maple1
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    Yes, how the flow switches are playing with the temperature regulation of the gas boiler is a bit of a fuzzy thing, in my mind at least. I would think the gas wouldn't fire if the boiler was hot enough even with flow through it? I have no experience with a gas boiler though.

    I would also likely change my marked up version and put the DHW mixer after the boiler - so the boiler is getting the hottest water, to help prevent it from firing. And, since the DHW plate would be acting more or less as an on demand heater - I would also likely make it bigger.

    I'm kind of thinking there might be two controlling things going on inside the boiler - one for heating & one for DHW? They might at times each have different temperature requirements also - DHW needing hotter stuff than in-floor but more infrequent. Kind of guessing at some of this.

    But another consideration is that DHW demand is only a fraction of heating demand. Everyones situation is different of course but I think I see at our house that DHW demand is about 1/30 of heating demand, in the heating season. In other words - it might not really matter a whole lot if the gas still heats the DHW.
     
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  3. Eureka

    Eureka
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    The manufacturer told me that the boiler will still fire with preheated water, and will error out. Too smart for its own good kind of thing.. High return temps (over a 20 degree difference) won’t allow it to operate normally. Which is the first thing I found out in all of this remember. I can’t heat the return water.

    My household uses a lot of hot water, and I also will be using it for power washing.
     
  4. Eureka

    Eureka
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    Just put it there to keep positive pressure before the circulator. I’ve been told it’s a good practice and a good spot to have an air vent.
     

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