What is the maximum distance allowed for hot water lines before a recirculation line is needed?

The maximum distance allowed for hot water lines before a recirculation line is needed is set at 100 feet. This requirement is designed to ensure that hot water is readily available at fixtures without excessive delays. While longer distances can lead to a longer wait for hot water to reach the faucet, a recirculation line helps in maintaining the temperature of the water, ensuring efficiency and comfort in a plumbing system.

In the context of plumbing design and efficiency, establishing this distance helps minimize water wastage and ensures that the water delivered is hot without significant loss of heat. When distances exceed this guideline without a recirculation system, there is a higher likelihood of issues such as temperature drop and increased water usage, ultimately affecting the performance of the plumbing system.