Which gas is typically used as a backup for natural gas in many appliances?

Propane is commonly used as a backup for natural gas in many appliances due to its similar burning characteristics and energy content. It is a versatile fuel that can be used in residential and commercial heating, cooking, and hot water systems. Propane can be stored in liquid form under pressure, making it convenient for use in areas where natural gas pipelines are not available.

Its combustion produces a high energy output, making it effective for various appliances designed for gas use. Additionally, propane is easily transportable, which is beneficial in situations where a consistent supply of fuel is necessary.

While butane is also a type of liquefied petroleum gas (LPG) similar to propane, it is generally used in smaller applications and colder climates. Hydrogen is primarily considered for future energy solutions and is not a conventional backup option for natural gas in standard appliances. Acetylene is mainly used for welding and cutting applications and is not suitable for heating or cooking purposes.