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mod-con with high temperature emitters
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