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Donner Power Electric Patio Heater Review Certain models can generate up to 38,000 BTUs, which is enough to heat a moderate-sized deck or patio. They use a standard propane tank of 20lbs and come with a built-in safety valve. Freestanding and wall-mounted patio heaters are the most commonly used, standing 7-8 feet tall. They plug into a standard 230-volts electrical outlet. AZ Patio Heater