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Patio Electric Heater Patio electric heaters offer modern ways to expand your outdoor living space. Electric heaters do not emit carbon monoxide and can be used in enclosed spaces without ventilation. To determine the power (BTUs) required to heat your space, calculate the cubic footage of the area and the degree of temperature rise you wish to achieve. Power Patio heaters are great for keeping outdoor living spaces warm and comfortable even when the sun sets and temperatures drop. Radiant heat is released from the heaters to surrounding surfaces and