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Patio Electric Heater Patio electric heaters are a modern method of extending outdoor living spaces. Contrary to the older natural gas and propane-powered patio heaters that emit carbon monoxide, electric models do not require ventilation and are safe to use in enclosed areas as long as they are not left unattended. To determine the power (BTUs) needed to warm your space, take note of the cubic footage of your space and the degree of temper