Next simulation I wanted to run is how fast does the vat loose heat. 

There is a number of assumption. One is that the whole vat is the same temp. In practice this is never the case. So the question what is the vat temperature depends where you measure. I decided that I will measure the temperature on the inside of the long side of the vat. In a sense there the temperature should be highest because the heater is located on the outside of the same wall. Next assumption is that the vat is empty. And the third one is we will test it a single lumped thermal mass.

Since I already have a 3D model of the vat I can get the volume, and the surface of the vat. I can also measure the weight of it. 

Again we are pretty close to the real deal. This gives me a starting point for another experiment. The walls of the vat are empty which is terrible for thermal conductivity. I plan to fill the gaps with AS1803 which is a great thermal conductivity and this will double as glue for the heaters as well. Will it make such a big difference to justify the price? 

Cheers!

M.