I just finished my first 2 rolls of C-41 in my home made setup. The 200 watt heater seems to be undersized for my setup, it seems that there will be a 300 watt sometime in the future. For right now though, it works ok. Without anything in the container, I can get the water up to 102(F), but as soon as I put my chems in to warm up, the temp dropped 6 degrees and stayed there. So I put the chems in the bathroom sink filled with very hot water to warm them up. Once warm and put in the bath, they held just fine and the heater was able to keep the temperature stable during developing.
As soon as the negs are dry, I'll scan them and post the link for some critiques.