12-19-2009, 01:42 PM
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Originally Posted by WisFish
Byron: I'm confused. You recommend two heaters for large tanks but your favorite setup is the one which only uses one?
The Eheim unit is really not a heater per say. There is a real coil in the bottom of the canister, much like a stove element coil. Not at all the (comparatively) flimsy heating coil of any stand-alone heaters I have seen. Not even a comparison. And the Eheim temperature probe is so sensitive it recognizes one-tenth of a degree, and the digital temperature display shows this. For example, the temp is set at 25.5C (78F) and the temp display will be 25.5 then 25.4 a second later, then 25.6 two seconds later, then 25.5 a second later, etc--you get the idea. I have the probe next to the filter intake so I know the temp is the tank water farthest from the actual heating unit in the filter, since the water has been heated and passed through the filter back into the tank oat one end and then flows to the opposite length-wise end where the temp is taken before the water re-enters the filter. It is very precise and accurate. I am not aware of any stand-alone heater that can achieve this degree of precision or accuracy. And except in summer heat waves or after a pwc, the variation in temp never, and I mean never, exceeds .3 from where it is set. And for 12 years steady use.
With stand-alone heaters, I would never rely on one in a 4-foot or larger tank. I did have this for a while, then added a second (my 70g) and noticed a much more steady temperature with both heaters.