Originally Posted by BBL_Brewer
If you can switch over to natural gas....you can avoid alot of the CO...the natural gas burns cleaner and more completely combusts giving off more CO2 than CO.
This is not entirely true. You can become just as dead with either gas if the burners are oxygen starved. IOW, an oxygen starved natural gas burner can be every bit as deadly as an oxygen starved propane burner.
Stole this from Wiki on the subject:
"Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
C3H8 + 5 O2 → 3 CO2 + 4 H2O + heatpropane + oxygen → carbon dioxide + water
When not enough oxygen is present for complete combustion, incomplete combustion occurs when propane burns and forms water, carbon monoxide, carbon dioxide, and carbon.
2 C3H8 + 7 O2 → 2 CO2 + 2 CO + 2 C + 8 H2O + heat
Propane + Oxygen → Carbon dioxide + Carbon monoxide + Carbon + Water
Unlike natural gas, propane is heavier than air (1.5 times as dense). In its raw state, propane sinks and pools at the floor. Liquid propane will flash to a vapor at atmospheric pressure and appears white due to moisture condensing from the air.
When properly combusted, propane produces about 50 MJ/kg. The gross heat of combustion of one normal cubic meter of propane is around 91 megajoules
Propane is nontoxic; however, when abused as an inhalant it poses a mild asphyxiation risk through oxygen deprivation. Commercial products contain hydrocarbons beyond propane, which may increase risk. Commonly stored under pressure at room temperature, propane and its mixtures expand and cool when released and may cause mild frostbite.Propane combustion is much cleaner than gasoline combustion, though not as clean as natural gas combustion. The presence of CC bonds, plus the multiple bonds of propylene and butylene, create organic exhausts besides carbon dioxide and water vapor during typical combustion. These bonds also cause propane to burn with a visible flame.
Greenhouse gas emissions factors for propane are 62.7 kg CO2/ mBTU or 1.55 kg of CO2 per liter or 73.7 kg/GJ"
The bottom line is that both propane and natural gas burners can be operated safely so long as they are properly maintained and supplied with sufficient oxygen.