The answer to 'average cost for boiler' is that the typical range for a new boiler installation can vary greatly, usually between $3,000 to $10,000 or more. The final cost will depend on factors like the size and efficiency of the boiler, the complexity of the installation, the cost of labor in your local area, and whether any additional work is required like upgrading pipes or venting.
It's important to get multiple quotes from local HVAC contractors to get an accurate estimate for your specific home and needs. They can assess your existing system, recommend the right boiler size, and provide a detailed breakdown of all the costs involved.