Thank you so much!!! 200F! I feel so safe now lol!Yeah the bottom has a bit of a curve upwards and when I push it from above it will pop back a lot so I was worried is it because some part of the plastic tub is heated and some is cold so the temperature difference makes it transform I just search styrofoam and is it a kind of white board? I'm sorry may I know what does the "help the heat pad flush against the bottom" mean? Do you mean make it heat the bottom faster? So I should put the whole board directly under the tub right? I currently put some books under the four corner of the tub and leave an empty between the pad and the carpet since I always worried it will burn if someday the thermostat lost control lol!! So I can actually don't leave any space between the heat pad and other things right? Oh and I have a temperature gun and it's super awesome!! So convenient lol! Thank you so much for aways answering my stupid questions!!!!!

Quote Originally Posted by MissterDog View Post
If I'm understanding right you mean the bottom of the tub has a bit of a curve upwards right? If so that's how mine is too when I bought it and part of the design.

Was the swell present before the heatpad was set up? Keep in mind when you sandwich the thermostat probe between the bottom of the tub and heatpad there will be abit of a "arch" or "air pocket. If this is the case I don't think you need to worry.

If anything you may just need to put sheets of styrofoam underneath it to help have the heat pad flush against the bottom. As long as the heatpad is regulated by your thermostat the plastic won't melt. If you think about it human body temperature is around 96. If the plastic was so sensitive to heat it would start melting in our hands aha.

All plastic are different but generally melting temperatures are around 200F and above minimum. Not that you wanna get anywhere close to that but it gives you an idea of what temperature are dangerous as far melting goes.

Edit: Also if you don't have one already I recommend getting a temperature gun to measure surface temperatures accurately.