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What to Look For in a Garden Patio Heater Electric Look for models with multiple heat settings if you want to get the most value of your electric garden patio heater. This will help reduce running costs by using only the amount of heat you require. Also consider the heating power of each model, which is shown in BTUs. A higher number will generate more heat, and can be used to determine the amount of space a heater can warm. Versatility Patio heaters extend the usability of your outdoor living spa