What does "temperature rise" refer to in the context of a hot water heater?

In the context of a hot water heater, "temperature rise" specifically refers to the difference in water temperature as it flows through the heater. This is calculated by measuring the temperature of the incoming cold water and the temperature of the water as it exits the heater.

For example, if the cold water entering the system is at 50°F and the hot water leaving the heater is at 120°F, the temperature rise is 70°F. This measurement is crucial since it helps in assessing the heater's efficiency and its ability to adequately heat the water to the desired temperature, ensuring it meets the demand for hot water in a household or commercial setting.

Understanding temperature rise is vital for proper installation, maintenance, and troubleshooting of water heating systems, as it directly relates to the heater's capacity and performance.