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RobinInCali
RobinInCali
edited March 17 in THE MAIN WALL

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Comments

  • mattmia2
    mattmia2
    edited August 2021
    Another option would be 2 cascaded boilers, you could pick the boilers to have a 10:1 turndown and sizing that better matches the load most of the time with one boiler firing near its maximum turndown but both could fire full to pick up some of the DHW load so you wouldn't have to do it all with quite as enormous an indirect. It would also give you some redundancy if one failed you would still have some heat.

    Oh, and it is very likely you could run an outdoor reset curve that kept the boilers in the condensing range most of the time.
  • Steamhead
    Steamhead
    Are all the systems hot-water, or do the radiators work with steam?

    Co-Founder, All Steamed Up, Inc.

    Baltimore, MD, USA

    mattmia2
  • Hot_water_fan
    Hot_water_fan
    Where does that heat loss come from? Seems high for somewhere so mild.
  • tim smith
    tim smith
    A lochinvar WHB 155 easily does it all. Or maybe an 055 for the 2 radiant and an 085 for upper floors radiators and indirect. That way one boiler for low temp one for higher. Plus could possibly set up some redundancy. Pretty simple.
  • RobinInCali
    RobinInCali
    Great suggestions so far. To answer questions: The radiators are hot water, 180 degrees. The heat loss is big because the square footage is pretty big and also, the original windows leak, windows cannot be replaced because they’re architectural.

    So nobody wants me to put in the single Pioneer boiler? I like the idea of two wall hung units.
  • Jamie Hall
    Jamie Hall
    The windows can't be replaced -- been there, done that many times. They can and should, however, be repaired -- and they can have interior storm windows added (several manufacturers) which are easy to put in and out and which bring them up to nearly the best of the modern triple glazed units. They're also cheaper.

    Do that and you will be very happy
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    JakeCK
  • woobagooba
    woobagooba
    edited August 2021
    Allied might be able to help with your storm windows. They are often used to satisfy historic district requirements.

    https://www.alliedwindow.com/

    They are pricey, but will provide better protection for your windows than interior storm panels. Restoration / maintenance of old windows is expensive (unless you have unlimited free time).
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes
    edited August 2021
    If they are one bedroom units, you could go with combi boilers that do both heating and DHW. That would save a lot of space.

    berkeleyradiant@gmail.com
    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

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