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one or two boilers?

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tim smith1
tim smith1 Member Posts: 26
in THE MAIN WALL
Have a job that will have appx 3000sft of radiant floor and the other 5000ft has a combo of zones of either cast iron radiators or water to air units. I have an option of either 1 large boiler with multiple temp controllers or I can do 1 modulating condensing boiler for infloor and ?? maybe one higher temp boiler for rest of heat needs. I'm leaning towards two boiler. All input welcome and thanks in advance.
Tim

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  • hot_rod
    hot_rod Member Posts: 22,242
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    It's nice to have

    the redundancy of two boilers. They do break down! Spreading the load between two would also greatly lessen the potential for gas guzzeling short cycling, when multi zoning is used.

    You might consider primary secondary with a tekmar stage control running the boilers. This control rotates, exercises, watches delta T, and a bunch of other nice features. Depending on your climate, one boiler may carry the lost most of the year, with the second boiler calling only on design days.

    Plus you can generate gobs of DHW with two boilers in a PS arrangement.

    Lots of options :)

    hot rod

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  • Steve Levine
    Steve Levine Member Posts: 106
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    One or two boilers....

    I wold not install two boilers as separate systems. Install them in modular or multiple boiler form. Deal with the dual water temperaure separately. When the loads are relatively low, only one boiler will op[erate, running at a high effeciency level due to long on cycles. When you need two, and only when you need two, will the second come on.

    Additionaly, this will allow a reasonable amount of heat in ALL areas, even if one unit malfunctions. Pipes and or people will not freeze.

    Steve Levine

    Slant/Fin
  • tim smith1
    tim smith1 Member Posts: 26
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    one or two boilers

    Steve, The only reason for seperated loads is that the infloor will run at a very low temp creating a high efficiency on the mod boiler. The other areas need higher temps and I felt to get the most out of the boilers was to do it this way, What do you think?
  • Jackchips
    Jackchips Member Posts: 344
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    I vote with

    Steve, Tim. Perfect example of where two boilers together will make a great system. Go back and read HotRod's comments.
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