Essentially, a boiler is like a big furnace or fire that’s controlled by your thermostat. The main function of a gas boiler is to act as a heater and provide buildings with the hot water they need, which is important for two very big reasons.
Firstly, the hot water produced by your boiler is pumped through your radiators when you turn on your central heating, providing them with a reliable source of heat. This keeps you warm and comfortable in the colder months of autumn and winter — and sometimes during spring and summer as well.
The second main function is providing a steady supply of hot water for your sinks, baths and showers. They do this by heating up a tank or container of water and keeping it at a consistent temperature, which means you can rely on the hot water you need to keep yourself (and your belongings) sparkling clean.