Why does not freshwater lakes become salty eventhough it meets ocean at somepoint? Do oceans grow more or less salty over time? If the oceans were only as salty as a fresh water lake, and had always been that way, would there be more life in the oceans that had evolved ...
Replacing a boiler typically costs an average of $50-$300, but this price can be drastically higher depending on where you live and the location of the boiler. Replacing leaking, aging, or bad ductwork costs an average of $35-$55 a linear foot for labor and materials, depending on the length and type of ducts.
1 This price should include removal and disposal of the old boiler. 2  High-efficiency gas boiler installation may require the addition of a chimney liner at a cost of $500 to $2,000. 3  If removing and disposing of the old oil tank is requiredâand not included in the initial estimateâthis could cost $500 to $2,500 or more. Lower output and/or mid-efficiency gas boilers cost $2,500 to $5,000 installed; higher output and/or high-efficiency gas boiler replacement cost is $5,000 to $10,000 or more.