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How to Troubleshoot a Freestanding Electric Patio Heater If you're fed up of tying up extension cords and carrying around propane tanks, think about an electric freestanding patio heater. This model is simple to set up, provides adjustable heat settings and comes with an automatic tip-over shut-off feature. When choosing a patio heater, be aware of the Btu output. For a small area that's 5,000 Btu is enough. Larger spaces need more he