Those radiator dissipation rating are a triumph of marketing. 1838 watts? With what, 80 C water and 90 dB 400 cfm fan? Their numbers are meaningless without knowing the test conditions.
And why the hell do they alway try to tack something to the end of watts? Power isn't watt-hours or watts per hour, it's just plain watts. Damn, I'd like to kick a marketor in the balls right now.