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How to Troubleshoot a Freestanding Electric Patio Heater If you're tired of tying up extension cords and lugging around propane tanks, think about an electric patio heater that is freestanding. This model is easy to set up, has adjustable temperature settings and comes with an automatic shut-off feature for tip-overs. When you are looking for a patio heater, be aware of the Btu output. A small area needs 5,000 Btu to get warm enough while larger areas require more warmth. Pyramidor dome-shap