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 Installing a high-efficiency oil boiler might cost $5,000 to $10,000 or more. 2  If replacing an older, low-efficiency boiler with a newer, more efficient model, you may have to install a new chimney liner at a cost of $500 to $2,000. If replacing an older, low-efficiency boiler with a newer, more efficient model, you may have to install a new chimney liner at a cost of $500 to $2,000.