17/3/2020 · Installing an oil-fired boiler ranges between $3,000 and $6,500. If you're looking for a replacement boiler, the costs for that including installation average around $5,150. Homeowners looking for high-efficiency boilers, which include 90-99% AFUE for gas and 90% for oil, will pay between $6,000 and $9,000 for both oil and gas models.
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