A gas boiler is essentially a furnace that operates while controlled and regulated by a thermostat. It primarily serves as a heater, keeping the inside of buildings warm and cozy. Additionally, it generates and provides hot water whenever required.

A gas boiler heats water using the power generates using natural gas. It uses the heat generated to warm up the water and provide a steady hot water supply to the various outlets of a home or building. The appliance heats an entire container or tank of water and maintains it at a consistent temperature. It allows an individual to get hot water over an extended period and at any time.

Overall, a gas boiler can act as a central heating system, generating adequate heat to warm up the entirety of a building. Generally, the hot air gets distributed via vents or gas networks.