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.
This has been calculated by the Energy Saving Trust, and is based on a household having the oldest, least-efficient boiler possible for a three-bedroom, semi-detached house. In reality, if your boiler was installed in the late 1990s or early 2000s, youâre more likely to save half of that. With the average price of a new boiler installation being approximately Â£2,300, and energy providers quoting closer to Â£3,000, the fuel savings are likely to be small in the short term.