👉 The term "boiler" is a household appliance that is used to heat water or steam for various purposes. It consists of a cylinder with a high-pressure heating element, and it has a tube connecting two sides of the cylinder. The hot water or steam is passed through the tubes at the bottom of the boiler, which causes the water or steam to boil. Boilers can be either manual or electric, depending on the type of appliance used in your home.