I have run my electric blankets folded, wrapped with plastic, and with trays on top for three years, for a month non-stop. I bypassed the off-timer circuit. Electric Blankets have since 1985, had built-in ground-fault circuits (grounded through the neutral side) that shuts down the blanket in case it gets wet, or develops a short, or overloads. I have a k-thermocouple under the center tray, and have never overheated my plants, even on high. The most I experienced was 95F on a high setting for 10 hours. Setting "7" holds about 80F on the Sunbeam blanket. I had the Sunbeam for 3 years now. I start upwards of 20 trays, so I have 3 blankets going for most of February 24/7.
Electric Blankets have a 10-hour to 12-hour auto shutoff. The Sunbeam Twin is 12-hour, and cost me $24.99 at Walmart. I bypassed the timer circuit on mine, but that is not practical for most people.
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