Elevated atmospheric CO2 levels show remarkable increases in plant growth productivity, and creating these elevated levels in your grow room is simply the easiest way to accelerate plant growth. Autopilot CO2 generators provide and maintain the carbon dioxide levels needed to meet maximum growing potential, and operate for only pennies a day. These highly reliable CO2 generators feature powder-coated steel enclosures that resist moisture, rust and discoloration, providing years of trouble-free operation. They are very safe and easy to operate. The built-in solid-state electronic ignition module creates a spark to light the burners. The units are also equipped with a safety tip over feature that shuts off the gas source if the unit is tipped or falls over. Autopilot generators are available in both propane and natural gas models, along with high-altitude versions in all sizes.