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Dual DHW tanks

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Paul Pollets
Paul Pollets Member Posts: 3,657
This took some time to make work. The new Viessman V300 tanks have been redesigned to lower production costs. 

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  • Alan (California Radiant) Forbes
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    I thought you retired.

    I like the redundant tempering valves.

    I also like V. dual coil indirects. We pipe them in series to get the boiler to condense.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Paul Pollets
    Paul Pollets Member Posts: 3,657
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    I did retire…sort of. This is a special project that required some experience in a tight mechanical room
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,074
    edited May 2022
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    What is that device between the check valve and the gauge on the return of the hot water circulating piping under the polypropylene piping?

    And it looks as though you have spring checks before and after the recirc. pump?

    Nice work in such a tight space. Not everyone uses unions at the equipment connections.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • mattmia2
    mattmia2 Member Posts: 9,828
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    Looks like a circuit setter