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Donner Power Electric Patio Heater Review Some models produce up to 38,000 BTUs of heat, which is enough to heat a medium deck or patio. They are powered by a 20-pound propane tank that has a safety valve built in. Freestanding and wall-mounted patio heaters are the most commonly used, standing 7-8 feet tall. Connect them to a standard electrical outlet that runs at 300 volts. AZ Patio Heater Whatever the size or small your patio is, the right heater will provide warmth and comfort. Gas patio heaters are best used in large open spaces where the heat can b
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