What type of hot water temperature switch provides the most accurate readings?

The immersion type hot water temperature switch provides the most accurate readings because it directly measures the temperature of the water in the tank or system where it is installed. An immersion switch typically consists of a sensing element that is submerged in the water, allowing it to detect temperature changes quickly and accurately. This direct contact with the heated medium ensures that the readings reflect the actual temperature of the water, leading to precise control of the heating system.

In contrast, other types of switches, such as thermostatic and capillary, can have limitations due to their design. A thermostatic switch often relies on a bimetallic element which can introduce some lag in response to temperature changes, affecting accuracy. Capillary switches, while useful in some applications, also depend on the expansion of a fluid within a tube, which can be slower and less direct than immersion measurement. Pressure switches work based on pressure changes rather than direct temperature measurement, and therefore are not typically used for high accuracy in temperature readings.