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Wall heaters operate by heating a stream of air moving through the unit by convection. There usually is no blower. Important elements include the heat exchanger, exhaust venting, controls, and clearances from combustible material. Wall heaters are simple and easily maintained, but do not distribute heated air efficiently. Installation of a forced air heating system might be considered in conjunction with other upgrades and/or remodeling. Because the nature of the moving air stream, Wall heaters tend to rapidly collect dust, animal hair, etc. in the lower part of the unit. Regular vacuuming (with a special nozzle, if necessary) is important for the furnace's safe operation.

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Q: How does a gas wall heater work?
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