The cost for replacing a standard gas boiler is about $4,000. A high-efficiency model costs about $7,500. This cost estimate usually includes removal and disposal of the old unit, as well as all necessary lines, ducts and wiring needed for the new system to run properly.
Jun 8, 2016 - The Overall Cost. The overall cost of installing a boiler depends on several factors, including location, but an average cost is between $4,000 and $7,000. High efficiency units are more expensive, with an overall cost ranging from $6,000 to $10,000.
Additionally, if you have an old radiator system or are replacing a regular boiler, you'll have to install the same type moving forward. Because standard boilers can handle more pressure, they are on the expensive end of the boiler spectrum. Regular boiler prices range from $3,000 to $7,500.