07-29-2011, 02:12 PM
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Personally, after having both, I prefer the black submersible heaters to other brands such as Eheim, due to appearance.
I have an aqueon(?) I think that's black in color and the LED indicates green when @ temp, red when heating. The adjustment is not finicky like some heaters, although you can't "calibrate" the setting scale like the Eheim heaters (that never worked particularly well for me anyway). I find the Eheims rather large for their wattage.
I also like to use two lower-wattage heaters, rather than one. I install one at each end (more or less). If one fails in the heating mode, it won't have enough wattage to fry the fish. Also, if one fails, the temp won't get too out of line before I'd notice.
Wattage range, I use 200 watts total, but that depends on how cold you keep your house in winter and your tank temp. There is a formula for watts/gallon based on the surrounding air temp and tank temp. Search around the forum and I bet you can find it.
Last edited by DKRST; 07-29-2011 at 02:17 PM..