Greetings with my first question: DHW as radiant zone?

Discussion in 'Geothermal Heat Pump Applications' started by Knarrly Viking, Aug 8, 2015.

  1. Knarrly Viking

    Knarrly Viking New Member

    I am designing my home for Western Washington state. 2400 sq. ft. 1-level, slab-on-grade, house with hydronic in-floor heat and no cooling. Heat loses in the house come out to 22000 btu/hr in the winter. I'd like to use a 3 ton geothermal water-to-water to give me room for DHW. Read about Desuperheaters, which are great for summer A/C waste heat, but are less of a great thing in the winter. It's not an expensive add on, but I was wondering if anyone has just heated a DHW preheater tank (that supplies tankless DHW heaters) off the manifold that feeds the in-floor tubes? I would still have a buffer tank between the geothermal unit and the floor manifold to limit cycling.
  2. docjenser

    docjenser Well-Known Member Industry Professional Forum Leader

    DSHs work also great in the winter, making DHW with the efficiency of the geo system.
    Running the DHW off the same heatpump as a zone is more elegant, but more expensive solution.

    Some older designs without the more efficient buffer tank bypass/load direct principle, but the idea is the same.

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