Customer Reviews

Hydor THEO Submersible Aquarium Heater 300W UL

5 star:		(1)
4 star:		(0)
3 star:		(0)
2 star:		(1)
1 star:		(3)

 

 

This heater did not work from day one. It almost cooked my fish as it never turned off. Do not buy this junk.

Heater worked for about 2 months, then it simply stayed in the "on" position and before I could notice it had raised the tank 6 degrees! I never could get it to turn off again. Very dissapointed.

Just give yourself warned. This junk heater can cook your fish any time. This happened to me twice in the last 2 months after used for about 6-7 months. Like other reviewers, the "ON" will lock in and your tank temp. keeps rising 'til your fishes boiled. Take my words and the other two reviewers to not to buy this junky heater.

This heater worked well for a time. However, after several months of use, it failed. As with what happened to another reviewer, when it failed, it locked in the on position. I believe the thermometer read about 100 degrees when I discovered it. All the fish in the tank but one died.

The temperature was set when it was first installed and never touched thereafter. I've had submersible heaters before and since, and I've never had one fail like that.

Used for my reptiles and has met its shatterproof needs. Feels durable and heavy. And warms the water perfectly even if there is constant water movement in the aquarium.