This Infrared Electric Patio Tower Heater with Fire Light (Westinghouse WES31-1588) is unlike other heaters. Yes, it is safe for indoor or outdoor use, is weatherproof, plugs into a standard wall outlet. But, this heater also has a built-in LED light bulb which simulates a burning flame while also providing ambient lighting. It'll feel like your gathered around a fire, minus the annoying smoke and sparks.
IP55 certified weatherproof rating makes this heater safe to use outside even if it's wet. Also, you won't have to put it away every night.
Low operating cost (pennies/hour) means your electric bill won't skyrocket.