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How to Troubleshoot a Freestanding Electric Patio Heater You should consider an electric freestanding heater if you're tired dealing with extension cables and propane tanks. This model is easy to set up, provides adjustable temperature settings and has an automatic tip-over shut-off function. When buying a patio heater, be certain to be aware of the Btu output. For a small area, the 5,000 Btu is enough. Larger spaces require more heat. Pyramid- or dome-shaped heater