Why is my heater not producing enough heat in my Duraflame Dfi 550 22?
Either you are using a power strip, surge protector or extension cord, or the unit's location might be affecting its performance. Ensure it’s plugged directly into an outlet and placed against an interior wall for optimal heating. (Page 4)
From the official Duraflame Dfi 550 22 manual, page 4
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