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I converted from Oil to heat last year and the plumber installed a Williamson GSA‑250 Complete 250,000 BTU Steam Boiler. It seems like it is way oversized. My was built in the 1920's and is 2,500 square feet with poor insulation. I plan on insulating my house and am wondering if this boiler is oversized and if it is worth replacing? Also being that the boiler probably runs for less time because the home heats up quicker, would I really be saving money by replacing it?