
Given that what it says is "...output of 356 Watts (1,214 BTUs)...", I guess they meant 356 Watt-hours - which would, of course, be true if one left the 150 heater on for about 2.37 hours
Given no losses, and provided you could persuade the towels to part with all of their stored heat at a constant rate, over exactly one hour, that should workYou cover it with dry towels, lots of them, for 2.37 hours. Then remove towels and have 356W of heating for following hour.
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