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jms319 Anupdate after more than 4 years... More than 4 years ago, I bought this Stirling Engine (I submitted the above review with the yellow mug) and it still works great. Almost every day in the past years, I started up the engine, running on the hot water that was used for boiling potatos, vegetables, etc. Only I replaced the yellow coffee mug with a Double-Wall Insulated transparant Glass which keeps the heat of the water much longer hot than the yellow cup. You also can see what the motor is running on. The diameter of the top of that glass is 9 centimeters. The stirling motor runs normally for about two hours now, very fast in the beginning and while the water gets colder, slower and slower, until the motor finally stops. Even after four years, it's still a great gadget. Thanks again, Banggood for this very nice and well built Stirling Engine!