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Gas Patio Heater Sale Calcana's overhead patio heaters with gas are perfect for heating large commercial or residential outdoor areas. They use radiant technology to heat people and objects, not the air. This makes them more efficient. The units can be hung on the wall or ceiling to maximize space and save the floor space. They are also simple to operate for employees without lengthy training. Versatility Gas patio heaters that are most efficient can be used in a