Good Economical Heaters By JJ12680 on 10/27/2010
JJ12680 would recommend this product to a friend
I have several Hydor Theo heaters in various wattages (50-400). Although I wouldn't trust my display tank to just one (with a back up I probably would), I can't say enough about their surprising reliability and accuracy. I use these heaters for my make-up water, saltwater for water changes, and freshwater tanks. I turn them on and off, take them in and out, and I've only ever had one break (A 400 watt heater that broke a day after I got it). In my experience these heaters easily maintain a +1/-1 temp variation. If you're looking for an economical, good heater I'd say these are it.