A conventional boiler is also sometimes called a heat only boiler. This type of boiler uses hot and cold water storage tanks, usually installed in your home’s loft. The boiler unit is plugged into your mains, which supplies the water to be used in your home.
The boiler fires up by igniting its fuel, usually gas or oil. The heat exchanger warms up the water. A pump transports the water to the hot water storage tank for use throughout the day. When you set your thermostat, the hot water moves to through your radiators, emitting its heat energy to warm up the room.
The hot water is also directed to water outlets in your bathroom and kitchen when you turn on a tap.