waterbed heater for seed starting?

I have a couple of old waterbed heating mats and decided to see if they could be used for bottom heat to start seeds in the greenhouse. Has anyone else used them for this purpose?

They have a strange little 3-pronged plug, though, with the prongs much shorter than normal plugs. Are they meant to be attached to some sort of transformer which then gets plugged into the wall socket?


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Diane Whitehead Victoria, British Columbia, Canada
maritime zone 8
cool mediterranean climate (dry summer, rainy winter - 68 cm annually)
sandy soil

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