I'm guessing the three valves you mention, are on the rear of the heater, like the bypass valves? The upper, and lower valves should be open, and the center one closed. That one will allow cold water to mix with the hot side, and give you only warm water. I think you'll find the cold water enters from the bottom valve, and your hot water goes out the top one.
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2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
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