Gas Boilers
Gas boilers are any type of boiler that is fueled by natural gas. They are the most common type of boiler used for heating applications in the United States. Gas boilers use a natural gas flame to heat water to a specified temperature or to its boiling point, thereby producing steam.
One type of gas boiler gaining popularity in heating, particularly in Europe, is known as the condensing boiler. Condensing boilers have a second heat exchanger, or an extra-large heat exchanger, that captures the heat lost from the initial burning of natural gas. Condensing boilers are up to 30 percent more efficient than traditional boilers but are also more complicated and harder to install. Recent legislation in the United Kingdom, however, requires all new gas and oil boilers installed in homes to be condensing boilers.