How does an unvented room heater typically provide warm air?

An unvented room heater typically provides warm air by using gravity or fan circulation. These heaters operate by burning fuel, such as propane or natural gas, creating combustion gases that heat the air in the room. The resulting warm air is either circulated by a fan or rises naturally due to gravity—hot air is less dense and thus ascends, allowing cooler air to be drawn into the heater for reheating.

This method of heat distribution is effective for providing warmth in a space without needing external venting to the outdoors, which is a characteristic feature of unvented systems. The choice of gravity or fan-based circulation allows for a more direct heating experience, effectively warming the area without requiring additional exhaust systems.