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40-50k btu boiler?

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maitoboika
maitoboika Member Posts: 4
edited 7:12PM in Radiant Heating

Wondering if anybody has experience installing smaller boilers, or know of any decent ones? The system is about 40,000 BTUs, with 7 panel radiators. I was planning on a Viessmann Vitodens 100w B1HE-85. I’ve been having problems finding a boiler with a smaller btu output.

Comments

  • DJS
    DJS Member Posts: 6

    lochinvar whb055 or whb085 depending on what your supply water temperature is. If it's 180 degrees the 55 might be light.

    Ibc sfb99-1 works great too.

    Most boiler these days can set a max output or have ramp delays to allow you to not be super oversized.

    I just put a IBC sfc125-1 in my shop and only need about 35,000 btu's for heating and the rest is for DHW. I set the max heating output for 45%(the heating side is maxed at 99,000). But I'm also only heating the floor temp to 85 degrees.

    kcopp
  • mattmia2
    mattmia2 Member Posts: 16,357

    The better question is what the minimum load is. Most mod cons can operate at a bit less than their max output without a problem but the higher max output means that the min output will also be higher and that could be a problem on a system with a small zone.

  • kcopp
    kcopp Member Posts: 4,662

    The IBC HC will get you between 13k and 50K

    I have a bunch out there. Very reliable for me.

  • hot_rod
    hot_rod Member Posts: 27,260

    I have a Lochinvar Knight 55K, 51,00 output. It modulates down to around 8,000 BTU/hr. It has nice control features.

    With panel rads you should not need much above 140- 150°

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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