https://elearnportal.science/w....iki/Gas_Patio_Heater
Gas Fired Patio Heaters Gas patio heaters are becoming increasingly popular in both commercial and residential outdoor spaces. Generally, these units are freestanding and have an reflector dome or shield to direct radiating heat downwards. They are usually connected to a gas line and eliminate the requirement for propane tanks, thus reducing operating costs. They are less mobile and more prone to high winds than propane models. Efficiency Patio heaters are known for extending outdoor