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Patio Electric Heater Patio electric heaters are a modern method of extending outdoor living spaces. In contrast to older natural gas and propane-powered patio heaters, which emit carbon monoxide, electric models don't require ventilation and are safe to use in enclosed spaces 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 the area and the temperature rise you would like t