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How to Troubleshoot a Freestanding Electric Patio Heater Think about a freestanding electric heater if you're fed up of dealing with extension cables and propane tanks. It's easy to set up, has adjustable heat settings and comes with an automatic tip-over shut-off feature. When you purchase a patio heater, be sure to pay attention to the Btu output. For small areas, the 5,000 Btu is sufficient. Larger areas require more heat. Tabletop heaters are typically more efficient than pyramid or dome-shaped m