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mod con with high supply temps
I’m considering a HTP EFTC-140F combi boiler for a small house with 62 feet of baseboards and a design day load calculation of 37K. The EFTC-140F has a minimum fire rate of 28K BTUs so high temp or more emitters would be needed to keep the boiler from short cycling. I’m less concerned about fuel cost and more concerned about shortening the life of the boiler or needing expensive repairs. Won't the efficiency of the boiler still be around 80-85% with high water temps?
Besides reduced efficiency is there another reason not to use a mod con boiler at high water temps (165 -175F?) If I need to keep the supply temp high in order keep the boiler from short cycling (baseboard emitters) am I going to reduce the lifespan of the boiler or require excessive maintenance?
My primary reason for looking at a mod con is to be able to side vent with PVC and also provide DHW in a relatively small amount of space.
Thanks for taking the time to read!