Question about water bed heaters
I scored a free waterbed heater, set it up, put my seed trays on it, set it for 75 degrees and in a matter of seconds it was very hot to the touch. Should the light go off at the desired temperature? What do you do with the metal probe? (I would assume thats what measures the temp)and does it have to be under a water source, (such as the waterbed liner to work properly) I was really hoping to use this heater as I heard of others using them successfully. I did a search from previous posts, but werent very helpful. Can I just put a towel over the heater, then seedlings on top?