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Boiler efficiency...

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Jamie Hall
Jamie Hall Member Posts: 23,441
To satisfy my curiousity, are there data available for modulating gas boilers for the efficiency of a properly tuned boiler at various turn down levels? I saw a set of graphs recently for various return water temperatures, but did that also have various firing rates? Can someone point me to a source?
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England

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  • HVACNUT
    HVACNUT Member Posts: 5,864
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    I'm not sure theres anything that specific. A lot of manufacturers want separate tests at low and high fire within their parameters.
  • SuperJ
    SuperJ Member Posts: 609
    edited February 2019
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    I'm doing a commercial job with 10 Aerco boilers in parallel.
    Benchmark Platinum 6000's. Basically you want to run as many boilers as you can at as low a fire rate as possible for max efficiency.

    http://aerco.com/sites/default/files/document/document/BMK 5000 Efficiency Curves.pdf


    Solid_Fuel_Man
  • RayWohlfarth
    RayWohlfarth Member Posts: 1,518
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    @SuperJ I saw where Weil Mclain does that as well Not sure if it really saves as much as one boiler running while other is isolated
    @Jamie Hall Here is a pic from PK Boilers where they show the various firing rates at different return temps

    Ray Wohlfarth
    Boiler Lessons
  • Jamie Hall
    Jamie Hall Member Posts: 23,441
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    Perfect! Thanks guys -- exactly what I was looking for. Off for some more rumination here...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England