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mod-con with high temperature emitters

hot_rodhot_rod Member Posts: 12,963
edited October 2015 in THE MAIN WALL
At last weeks Coffee with Caleffi webinar, Jody did a fine job of showing and explaining the concept.
Using ASHRAE Hours of Occurrence data you can determine what % of the season you are at, below or above design condition. This example was for Boston.

With this data and a proper ODR installed and adjusted you may be able to allow the boiler to run in condensing mode for much of the season.

The 1 hour webinar is archived at this link, webinar #10

Bob "hot rod" Rohr
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
Steve Minnichkcopp


  • NYplumberNYplumber Member Posts: 503
    HR, the webinar was nicely organized. A good watch even for those that are fluent in combustion and modcons. You never know where you can pick up a tip or two.
  • HenryHenry Member Posts: 962
    Of the 1050 heating hours here, only 150 hours are at maximum boiler design temperature.
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