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Kullander and Essen were given permission to examine the setup, check for hidden power supplies, fill the reactor with hydrogen, calibrate the volume of water flow, monitor the temperature of the water flow in and out of the system, and observe the entire experiment. The reactor contained 50 grams of nickel powder and .11 grams of hydrogen. In their report (pdf) they state, "We had free access to the heater electric supply, to the inlet water hose, to the outlet steam valve and water hose, and to the hydrogen gas feed pipe. The total weight of the device was estimated to be around 4 kg."
The result of the experiment was a constant average production of 4.69 kW of power for almost six hours. Additionally, the input was on average 330 watts (30 of which was used by the electronics controlling the setup). This is fifteen times less than the energy produced by the device (15x overunity).