It is much less common in Europe, where hydronic heating predominates, especially in the form of hot-water radiators.

Types

Natural gas/propane/oil/coal/wood

*Heat is produced via combustion of fuel.
*A heat exchanger keeps the combustion byproducts from entering the air stream.
*A ribbon style (long with holes), inshot (torch-like), or oil type burner is located in the heat exchanger.
*Ignition is provided by an electric spark,

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