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How to Choose the Best Gas Patio Heater Gas patio heaters utilize propane instead of electric patio heaters which require electricity and are expensive to operate. On hot days, they may also sputter or burn through the tank in a short time. Look for heaters with a pyramidal design that connect to standard propane tanks and that can produce 40,000 Btu. They are typically able to provide more heat to larger areas and colder cl