At what height should unvented room heaters be installed for safety?

Unvented room heaters should be installed at least 18 inches above the floor for safety reasons. This height helps reduce the risk of fire hazards and ensures that the heater operates efficiently. Placing the heater too low can lead to the accumulation of flammable materials or debris, which poses a significant danger. Additionally, higher installation helps in achieving better air circulation, allowing for more effective heating and reducing the buildup of harmful gases that may occur with unvented systems.

Choosing any height below 18 inches, like ground level or 12 inches, would not provide the necessary clearance to mitigate these risks effectively. Meanwhile, selecting a height of 24 inches might be seen as overly cautious, but the established safety standard recognizes 18 inches as sufficient for safe operation in most residential environments.