What is a common feature of modern hot water systems to enhance efficiency?

Programmable thermostats and timers are commonly integrated into modern hot water systems to significantly enhance efficiency. These features allow users to customize the heating schedule based on their needs, ensuring that water is heated only when necessary. This not only helps in conserving energy by reducing unnecessary heating but also can lead to considerable cost savings over time.

By utilizing programmable options, users can set their hot water systems to operate at specific times, such as during periods when hot water demand is high and to lower temperatures during off-peak times. This adaptability ensures that resources are used effectively, which is a key aspect of modern energy-efficient designs. In contrast, manual temperature control lacks sophistication in energy management, and single-zone heating does not cater to the varying needs of different areas, reducing overall system efficiency. Low water pressure operation may be necessary in specific installations but does not inherently enhance the efficiency of the hot water system itself.