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I recently purchased an early 1900s house with my first steam heat system (1-pipe). I have been getting ready to insulate the uninsulated mains with 1 inch fiberglas, but I recently noticed that the boiler appears significantly oversized. The boiler is 128,000 BTU, but my EDR calculation suggests I need only 56,504 BTU. I'm now worried that insulating could lead to significant short cycling. The main is about 80ft of 2 inch iron, and it has a single Gorton #2 main vent (I believe that's all there is currently room for as the vent only has a 1/4 inch tapping). Is the risk of bad short cycling a serious concern that weighs against insulating or shall I go ahead and insulate?
Any advice is most appreciated!