Burners and anti-freeze spark plugs are systems that are based on the direct transfer of heat to the environment. LPG or other fuel combustion burners move continuously in the fruit-farm/vineyard on trolleys pulled by tractors or with independent engines; while special anti-freeze spark plugs (paraffin cans or other fuels which are called “buglie” in France) are distributed in high numbers in the middle of the fruit-farm/vineyard to spread heat to the environment.
