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How to Troubleshoot a Freestanding Electric Patio Heater If you're tired of dealing with extension cords and lugging around propane tanks, think about a freestanding electric patio heater. It's easy to set up, provides adjustable temperature settings and comes with an automatic tip-over shut-off function. When purchasing a patio heater, be sure to check its Btu output. A small space requires 5,000 Btu to get warm enough and larger spaces require more heat. Pyramidor dome-shaped heaters generally have a higher Btu output than tabletop models. Easy to