Quote:
Originally Posted by Acres per Second
1) Ceramic heaters also retain heat after use; however, the "cost" is a slow warm-up. 
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Any heat they are retaining is coming from heat produced by the electricity they consume. You're not getting "free" heat just by using a ceramic heater. It's basically as you noted, they take longer to warm up, and longer to cool down. But for a given number of BTU's output the cost to operate will be the same as any other electric heater.