Can the Outback propane outdoor heater be used in an enclosed swimming pool area? My gym is running 2 of the Outbook heaters during the night and turning them off in the morning when people come to use pool for exercise. Isn't the air dangerously polluted after hours of having the propane heaters running? Isn't the air then a 'silent killer'?

When you burn propane with adequate air supplied to it, the only products of combustion are carbon dioxide and water vapour. It is only when you reburn those spent gases that you will begin to produce carbon monoxide. You should have a detector in that area.

Any propane heater like that requires ventilation. The rule of thumb that we use is 1 square inch for every 1000 btu's. Look at the rating plate of the heater. It will probably say something like "btu input 50,000 at 11"wc. For 50,000 btu's you need 50 square inches of fresh air to supply the heater and allow spent gases to escape. So if there are windows in that pool room, you need to open at least one a few inches. Best case is to open one at each end of the room.

Propane heaters used in an enclosed swimming pool area at night... SAFE? or health risk?
Can the Outback propane outdoor heater be used in an enclosed swimming pool area? My gym is running 2 of the Outbook heaters during the night and turning them off in the morning when people come to use pool for exercise. Isn't the air dangerously polluted after hours of having the propane heaters running? Isn't the air then a 'silent killer'?
1 second ago - 4 days left to answer.

When you burn propane with adequate air supplied to it, the only products of combustion are carbon dioxide and water vapour. It is only when you reburn those spent gases that you will begin to produce carbon monoxide. You should have a detector in that area.

Any propane heater like that requires ventilation. The rule of thumb that we use is 1 square inch for every 1000 btu's. Look at the rating plate of the heater. It will probably say something like "btu input 50,000 at 11"wc. For 50,000 btu's you need 50 square inches of fresh air to supply the heater and allow spent gases to escape. So if there are windows in that pool room, you need to open at least one a few inches. Best case is to open one at each end of the room.