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Piping condensing boiler

Paul_28 Member Posts: 113
Is it necessary to use the Primary /Secondary system when piping a condensing boiler like the WM Ultra, to older fined copper baseboard???


  • Floyd_5
    Floyd_5 Member Posts: 418

    Don't even consider doing it any other way!
    You have to make SURE that you get good flow through the boiler.

    If piped correctly the condensing modulating boilers will work great and give great eficiencies.
    If not well......they work like crap!

    you was warned!!!

  • Paul_28
    Paul_28 Member Posts: 113
    Another question

    Thanks Floyd, that solves that problem. Another question, I have 120 feet of baseboard, at 600BTU per foot that’s 72000 BTU. The WM 105 Ultra has an I=B=R of 81MBH. Is that a good match??? My house is 1900 square feet, good insulation and windows... I also plan to use a 40 gallon indirect-fired water heater
  • Boilerpro_3
    Boilerpro_3 Member Posts: 1,231
    You need to do a heat load calculation

    BAsebaord capacity does not determine heat load. I bet the load for your home is only 40 to 50 thousand, but the only way to know is either calculate it, or check historic usage, which takes someone with experience to use.

  • Kal Row
    Kal Row Member Posts: 1,520
    listen to floyd, paul

    me and him tried to help out someone in another thread - whose contractor would not or could not follow the WM manual - and it's total do-do - it's going to litigation - that bad!!!
This discussion has been closed.