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Patio Electric Heater Electric patio heaters are modern ways to expand your outdoor living space. In contrast to older natural gas and propane-powered patio heaters that release carbon monoxide, electric models don't require ventilation and are safe to use in enclosed spaces, provided they are not left unattended. Calculate the cubic footage and desired temperature increase to determine the amount of power (BTUs). Power Patio heaters can keep outdoor living spaces warm and warm even when the su