shayneyasinski said:build a 2x4 frame that is 4 foot by 8 foot and lay down that waterbed heater and 3 layers of thick poly then fill it with water .
then lay down 3 more layers of poly.
you now have a place to heat up 16 big plug trays and controll the temp .
it is safe and easy
Yes it would, but who needs to germinate that many seeds?
Dale