Which device regulates the temperature of boiler water for Domestic Hot Water (DHW) generation?

The device that regulates the temperature of boiler water for Domestic Hot Water (DHW) generation is the aquastat. An aquastat is a temperature-sensing device used to control the operation of heating systems, specifically in boilers and water heating applications. It monitors the water temperature within the boiler and activates or deactivates the boiler based on the set temperature thresholds.

When the water temperature falls below the desired set point, the aquastat signals the boiler to turn on, ensuring that the water is heated to an appropriate temperature. Conversely, once the desired temperature is reached, the aquastat will turn the boiler off, preventing overheating and conserving energy. This regulation is crucial for ensuring a consistent and reliable supply of hot water for domestic use.

Other devices mentioned, while related to heating systems, do not primarily serve the same function. A thermostat typically regulates air temperature within a space rather than the water temperature in a boiler. A pressure relief valve is a safety device designed to prevent excessive pressure buildup in a system, which is a different function than regulating temperature. A flow sensor is used to measure the flow rate of water but does not control temperature. Thus, the aquastat is the correct choice for regulating the temperature of boiler water used for