It feels kind of warm, I just left it for like 2 hours and came back my hot spot said 86!!! I took the tub off and gun the middle of the flex watt and it said 110!! its like no heat is transferring up to the tub, do you think because i have it on the thin plastic shelf and my room temps are lower it is affecting it?? Could i get a foam insulation board and put my flex watt on it then put my tub on that?? Thanks for all your help i'm trying to get this figured out as i was planning on getting her towards the end of the week!!!!