Heating stones for massage is very easy. All you need is an electric frypan with enough water to cover the stones. The temperature of the water should be like that of a lovely warm bath. If you can place your hands into the water then the water temperature is suitable. The stones should be warm to hold, but not hot enough to burn the skin... if the stone is too hot to hold it is too hot to massage with. Just as you would adjust the temperature in a bath in order to enter the water, so too you want to adjust the water temperature that the stones are bathing in.
NEVER EVER heat your stones in a microwave or in a dry oven. The stone may have an air bubble deep within the stone that you cannot see. This air bubble can expand with heating and the stone could shatter.
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