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Interesting! Thanks, Jim, for your comments. I don't know whether our SuperStor is treated as a priority zone and/or prompts the boiler to heat up higher than my current 140-160 range (I set it for 170-190 in winter). It's quite possible that we don't use enough hot water at any one time to...

Adjusting boiler temperature for summer This same question has occured to me, as we have a similar oil boiler with probably the exact Honeywell temperature control unit bolted to it. My heating guy suggested that we set it 170-190 degrees in winter and set the thrid dial to a spread of 15...