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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 patio or pool deck. They use a standard 20lbs propane tank and have an inbuilt safety valve. The majority of patio heaters are either freestanding or wall-mounted, and they stand between 7-8 feet high. They plug into a standard 230-volts electrical outlet. AZ Patio Heater No matter how big or small your patio is, the right heater will add warmth and comfort. Gas heate