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How to Troubleshoot a Freestanding Electric Patio Heater If you're fed up of having to deal with extension cords and propane tanks, think about an electric freestanding patio heater. It's simple to install, has adjustable heat settings, and comes with an automatic tip-over shutdown feature. When you purchase a patio heater, be certain to be aware of its Btu output. For small areas, 5 000 Btu is sufficient. Larger areas require more heat. Tabletop heaters are generally more efficient than pyramids