A boiler is a device that heats water or produces steam for various applications, such as heating buildings or powering machinery. It works by burning fuel, like natural gas or oil, to generate heat, which is then transferred to the water inside the boiler. This heated water or steam can be used for heating systems, hot water supply, or even in industrial processes. In homes, boilers are often part of a central heating system, providing warmth during cold months. They can be found in different types, including combi boilers, system boilers, and regular boilers, each designed to meet specific heating needs efficiently.