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How to Troubleshoot a Freestanding Electric Patio Heater Consider an electric freestanding heater if you're fed up of dealing with extension cables and propane tanks. It's simple to install and has adjustable temperature settings, and comes with an automatic tip-over shutdown feature. When purchasing a patio heater, make sure to pay attention to its Btu output. For a small area, the 5,000 Btu is adequate. Larger spaces need more heat. Pyramidor dome-shaped heaters generally have more Btu output than tabletop