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Donner Power Electric Patio Heater Review Certain models can generate up to 38,000 BTUs which is sufficient heat for a medium-sized patio or pool deck. They use a 20-pound propane tank that has an safety valve that is built into. The majority of patio heaters are freestanding or wall-mounted, and stand between 7-8 feet high. Connect them to a standard electrical outlet that runs at 300 Volts. AZ Patio Heater Whether your patio is large or small the right heater will add warmth and comfort to any outdoor space. Lar