The component responsible for heating water in a coffee maker is typically a metal coil or plate. This component uses electricity to generate heat, which is then transferred to the water, enabling brewing. Different types of coffee makers employ variations of this technology, including immersion heaters that sit directly in the water and thermal blocks that heat the water as it passes through.
Rapid and controlled water heating is crucial for optimal coffee extraction. Precise temperature control ensures that the desirable flavor compounds are released from the coffee grounds without scorching or under-extraction. The evolution of these components has seen improvements in efficiency, durability, and temperature regulation, contributing significantly to the consistent quality and convenience of modern coffee brewing.