Hotwire, I have read that electric blankets should never be used while folded, and they should not have anything resting on them. This could be a safety issue.
I use a Salton warming tray set on LOW. Since even the LOW setting is too warm for seedling germination, I tone the heat down with one layer of ceramic tiles covered with a pizza stone. The seedlings go on top of all that. I put the seedlings flats in an old broiler pan which seems to conduct the right amount of heat.
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