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Patio Electric Heater Patio electric heaters are the modern method of extending outdoor living spaces. Contrary to the older natural gas and propane-powered patio heaters that release carbon monoxide, electric models do not require ventilation and are safe to use in enclosed spaces, provided they are not left unattended. To determine the power (BTUs) required to heat your space, you must calculate the cubic footage of the area and the temperature rise you would lik