i think the 200w is when the compressor is running, since my res is small (10-11 gal) and its insulated . . .and since my res is sitting at equilibrium at 67* right now i doubt it would even kick on much.
the cool thing is that the heate is built in so if i plug it in and set it at X, it will heat or cool as needed to maintain that temp. when it's not heating or cooling, it's usuing almost no watts. just for the sensors. the water is pushed through the chill by an external pump. that pump will add more watts still, but i have a feeling this wont kick on very often. . . soon it may just be heating. lol.
Oh, that's not bad at all then.
Random thought, but I guess LED lights and hydro would partner up very well as far as res temps
the funny thing is i had both of your ideas when i just realized. . . sweet, more cooling power. . . 200 more watts, ouch. lol.
go figure