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Donner Power Electric Patio Heater Review Some models produce up to 38,000 BTUs of heat, which is sufficient for a medium deck or patio. They are powered by a 20-pound propane tank that has an integrated safety valve. Wall-mounted and freestanding patio heaters are the most commonly used and are 7-8 feet tall. They connect to a standard 230-volt electrical outlet. AZ Patio Heater No matter how big or small your patio, the right heater can provide warmth and comfort. Gas patio heaters are best