have one.What else can I use? I just bought a hot stone massage kit. It says to use a roaster to heat the stones up, but I don't have one and they even look pretty expensive. I bought the kit, thinking I could heat the stones by microwaving them in water, or in a pot in the stove. Because I can monitor the temp, of the water with the thermometer. Is that possible, can I heat the stones another way without using a roaster? Like with the microwave or something like that. I was so excited to get this massage kit, and now hoping I'll get to use it. So please any help, would be great, thanks. An oven. How long should the rocks be in the oven, and at what temp should it be at?