Anybody tried using a hot plate as a heat source for keeping color chemicals at the right temperature? I'm using small tanks for film and trays for prints. I've looked at some circulating water heaters and water baths used in science labs but they are either real expensive or too small or somehow don't inspire any confidence in me that they could keep up. Right now I'm using an old electric hot pad and a modified fish tank heater to keep my water bath warm but I have a tough time keeping the chemicals at 100 degrees for C-41, tends to float down into the low 90's, I end up microwaving the developer for every run. I'm using the low-temp two-step RA-4 chemical kit from Ultrafine right now, but I'm getting more serious about RA-4 and looking at buying chemical kits that will need to maintain 95 degrees across three trays (Developer, Blix, & Stabilizer) and this is going to mean a lot more surface area to keep warm. I was thinking that an electric hot plate or two and large (non-disposable) turkey pans might make a cheap, adjustable, and workable water bath system. This http://www.cooking.com/products/shprodde.asp?SKU=255589&mybuyscid=5388418602 also looks interesting but even the low setting is 130-150 degrees. Any experiences or other ideas welcome.