Aquatop GH150 Aquarium Submersible Glass Heater, 150-Watt

This is not an expensive heater and after a failed attempt at a different brand heater I was a little worried. No worry for me (and least not yet). I put the heater in the tank, waited 30 minutes and turned it on. In a few hours after I turned it on the tank was up to temperature and has stayed there. The only thing I didn't like was the temperature was a degree or two off of what the heater said but not a big deal. I've had more expensive ones do the same thing. You have a minimum water line or it can go completely under the water. I have it set so I can change the temperature without sticking my hand in the water. I only just got this heater so if I develop any problems with it I will update my review but for now all is good.

Update Over a month later and all is still good. The water is always at the same exact temperature with very, very little variance. Even after water changes the temp is back quickly. I will be ordering another one or two for other tanks.

Update 10 months later and all is still good. Worth the money!

I use this heater to regulate the temperature of a water bath for my carboys full of wine. The thermometer on the outside of the carboys tell me this heater did its job perfectly.

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The heater was submerged vertically. It's my habit to check my aquarium's water temperature frequently. After 4 weeks, I noticed the water temperature was far below the heater's set temp. Upon closer inspection, I found fragments of the heater's plastic casing at the bottom of the aquarium. The casing had somehow fractured. Being that I live alone and none of my fish are capable of snapping plastic, I'd say something went wrong with the heater, unless a home intruder entered my home with the specific intent of shattering my heater.

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Use it in a 20 gallon water turtle tank. Had a 50 watt that was supposed to be enough but at 69° room temp could not keep up. This one has no problem with 85° and seems to be off more than on.

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This is exactly what I needed and works great. Keeps my fish comfy warm at the temperature I set it to.