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Upright non-flued liquefied petroleum gas heater, 1970s

A wall mounted gas heater that runs on either propane or natural gas.

A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane.

Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented.