I have experienced success with making yogurt on the stovetop; however, I have been intrigued with the idea of making it in the crockpot. It just seems like a good idea to make it based on time instead of stirring it and checking the temperature. That's not really much work; but I like the idea of streamlining the work time a bit more.
This method worked great for me, and I don't have a fancy crockpot. In fact, the crock has a chip of ceramic missing from the rim and it is basic. We're talking low and high heat and that's it. I placed 1/2 gallon of skim milk in the crockpot and turned it on low for 2 1/2 hours. I did this on a Sunday morning while I headed to the Y and by the time I came back it was ready for the next stage. Scoop out 2 cups of milk and mix with a container of plain yogurt; then pour that back into the crock and stir well. Many instructions recommend swaddling the crockpot in towels and letting it sit; however, I just put the covered crock in the oven overnight. It's runny and requires draining at this point but nothing that a dishtowel in a strainer can't take care of:)
This really worked! I like having both methods; however, I think I'm going to go with this crockpot method again and again. No thermometer needed.