The answer to 'how much to replace a boiler' is that the cost can vary widely depending on several factors. Typically, a new boiler installation can range from $3,000 to $10,000 or more, with the average cost being around $5,000 to $7,000. The exact price will depend on the size and type of boiler, the complexity of the installation, and your location.
Factors that can affect the cost include the boiler's fuel source (gas, oil, or electric), the efficiency rating, the brand and model, whether you need to upgrade the venting or piping, and the labor costs in your area. Additionally, if you need to replace related components like the expansion tank or circulator pump, that will add to the overall expense.