05-23-2012, 09:03 AM
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In my original setup I had a 200w Aqueon Pro submersible heater in my 60g. I like these because they are a plastic coated aluminum heater which I feel are more indestructible than glass. They also have the green light/red light LEDs to indicate operation.
After some discussions here, I liked the idea of having two heaters in the tank so that in the event one failed, there was a back-up, so I added another Aqueon Pro 250w. Although I've adjusted so they are very close, one is slightly more dominant heating than the other. However, if/when the room gets cool, both will kick in. Heaters are a case where 'oversizing' is a good idea. Byron is correct - most manufacturers rate heaters for tank sizes where the room will not be more than 10 deg F cooler than the target tank temperature....But what if/when the room temperature gets lower? Always better to have more heater horse power than a minimum requirement to ensure a stable temperature. I guess a caveat is if a larger heater sticks on, the time to over heat the water is reduced.
So, I'd use two 200w or 250w heaters. Set properly each works less than might otherwise be the case and if room temperature drops, there is extra capacity to maintain temperature....and if one heater should ever fail, there's a backup.