how much to fit a new boiler
1 Replacing an old oil-fired boiler with a gas model can cost thousands of dollars more than replacing one oil-fired unit with another, because of the need to install new gas lines and to update the existing fittings, valves, piping system and other parts to work with the new boiler.ust received a quote of $5,700 (boiler, parts and labor) to install a Lennox new boiler with a tankless water heater coil. I called a local company to check the specs on the boiler and found out it is a $2,000 boiler. $3K-plus for removal and installation seems a bit excessive for a 7 hour job!