For most types of preparation, the ideal water temperature is between 92-96°C. Regardless of whether you prepare your coffee with a hand filter or a Chemex, you should not do without a kettle with temperature adjustment. If you use too hot water during the brewing process, your coffee may become bitter. On the other hand, if the water is colder, the coffee becomes watery to sour. To avoid this, when choosing a kettle for pour-over preparation, you should make sure that it has a temperature setting. Devices with this function are also equipped with a display where you can read all important information such as the actual and target temperature.