- A desuperheater is a device that is used to control the addition of water to superheated steam to reduce the temperature to within 10°C of saturation.
- An attemporator also adds water to steam to control its temperature but the set point temperature is higher and the downstream steam is still superheated.
- Generally desuperheaters are used in process plants where the steam is used for heating. Attemporators are used more in power stations for interstage temperature control.