Which method does a gravity-fed hot water system use to distribute water?

A gravity-fed hot water system relies on the force of gravity to distribute water through the system. This method takes advantage of the natural tendency of water to flow downward from a higher elevation to a lower one. In such systems, water enters a storage tank, which is typically installed at a higher point than the outlets or taps. When a tap is opened, gravity allows the water to flow down through the pipes to the desired location without the need for added pressure from pumps or other mechanical means.

Using gravity for water distribution simplifies the system design and reduces the need for additional energy sources, making it a more efficient choice in many residential and certain industrial applications where elevation can be easily controlled. This is why choosing gravity as the method of distribution in a gravity-fed hot water system is the correct answer.