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Patio Electric Heater Electric patio heaters are an innovative way to increase your outdoor living space. Electric models emit no carbon monoxide and can be used in enclosed spaces that lack ventilation. To determine the power (BTUs) required to heat your space, you must calculate the cubic footage of the area and the degree of temperature rise you want to achieve. Power Patio heaters are great to keep outdoor living spaces warm and comfortable even when the sun sets and temperat