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How to Troubleshoot a Freestanding Electric Patio Heater Think about a freestanding electric heater if you're tired dealing with extension cables and propane tanks. This model is simple to set up, offers adjustable heat settings and has an automatic shut-off feature for tip-overs. When you purchase a patio heater, be sure to pay attention to its Btu output. A small space requires 5,000 Btu to be warm enough, while bigger spaces require more heat. Pyramidor dome-shaped heater