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How to Troubleshoot a Freestanding Electric Patio Heater If you're tired of having to deal with extension cords and lugging around propane tanks, you should consider an electric freestanding patio heater. It's easy to install and has adjustable temperature settings, and includes an automatic tip-over shutdown feature. When you purchase a patio heater, make sure to check the Btu output. For a small space that's 5 000 Btu is enough. Larger spaces need more heat. Pyramidor dome-shaped heaters typically have a higher Btu output than tabletop models.