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Product Reviews
5493 reviews on 1118 products!

ProductsTemperature ControlHeaters
Hydor THEO
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Product Description:
Hydor THEOThe first shatter-proof heater thanks to the peculiar glass tube.

Maximum security: : THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube.

Free positioning in aquarium with supplied suction cups.

Self-limiting: : the patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger for damage.
Product Specifications:
25W - 400W sizes
User Ratings: (33 reviews)
Overall: 5.42
Value/Cost: 5.48
Effectiveness: 4.79
Quality: 4.85
Ease of use: 6.58
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Found: 33 reviews Page  2 3 - View all
partsrep has used this product for 3 Years or More.
Overall Rating: 5/10 March 25, 2013
"Was OK, now it's not"
I used a 100 watt on a 10G for several years. I unplugged it to do some tank moving and when I plugged it back in it overheats the tank even on the lowest setting.
theoryguru has used this product for 3-12 Months.
Overall Rating: 3.25/10 April 11, 2012
"Better than nothing"
I set the temp to 78F and after a week it suddenly jumped to 84F. I reset the temp several times and now set to its lowest setting and still remains at 84F. My fish aren't bothered with the warmer than average temp, but I would never buy a Hydor. This particular heater came with a used setup.
I'm glad I didn't buy it new, better than nothing.
the blur has used this product for 1-3 Months.
Overall Rating: 1.75/10 April 13, 2011
"failed "
failed in a few months.
Geddonight has used this product for 3-12 Months.
Overall Rating: 4.25/10 February 9, 2010
"Get what you pay for"
I've purchased many heaters for my tanks. These heaters consistently fail "on" so they overheat the tank.
Ali1 has used this product for 3-12 Months.
Overall Rating: 1/10 December 30, 2009
overcooked my fish. Garbage product, only had it for 7 months, if that. If you love fish, stay away from this heater unless u intend on cooking for supper.
DrgRcr has used this product for 3-12 Months.
Overall Rating: 4/10 November 8, 2009
"Incredibly Inaccurate"
I bought this for my 10g fry/QT tank. The temperature calibration is way off from the dial setting, and it seems any small adjustments you make cause it to either not change or change way too much. Don't waste your money.
bradp has used this product for 3-12 Months.
Overall Rating: 4.5/10 March 9, 2009
"Killed All of My Fish!"
I am sure that there are heaters that fail from all manufacturers, but I have gone through three of these heaters due to inaccuracy of +/- 5 degrees. The final heater killed about 20 Cichlids in my grow out tank when the heater failed to 94 degrees.

I will never place another one in my tanks again. Probably the worst fish keeping experience to date as the smell of a fish boil is still in my home.
edmlfc has used this product for 3-12 Months.
Overall Rating: 2.25/10 July 17, 2008
"Junk, Junk, Junk"
Don't waste your time or money on this heater. I purchsed one, glad I only purchsed the one. It's total junk! Spend a little more money and get a heater that will not fry your fish. This heater worked for maybe 3 weeks. Now the only thing I use it on is my backup water. I plug it in and put it in a 55 gallon drum of water. It takes 15-20 minutes for the water to go from 65 to 78 degrees. Just imagine what it would do to my fish if I left it in the tank for 24 hours. And I have it on the lowest setting. I will never buy another one of these. I didn't even bother to have it replaced or exchanged. I don't want to take the chance that it will fry my fish. I don't want it replaced with another piece of junk. If you have no other option watch your temp very carefully!
KillerX has used this product for 3-12 Months.
Overall Rating: 2.5/10 March 13, 2008
"If you love your fish, DONT BUY THIS HEATER!!!"
Well I posted on the forum of my experiences with these heaters. Basically long story short bought a 200watt it lasted around 3 months then it heated up for no reason took it back and got another one bought a bigger tank so I bought a 300 watts did the same thing around 2-3 months took it back and got a new one then the replaced 200 did it again! then I said ferget it im not buying anymore im keeping the 300 and thats it. Until one day I come home and my temp is around 86 degrees. Please, if you care about your fish buy a quality heater!!! If you dont care then sure save the couple of bucks and watch your fish die.
Altumdreams has used this product for 0-1 Month.
Overall Rating: 1/10 October 3, 2007
"Horrible Floating Heaters"
I purchased 3 Hydor submersible heaters and all of them float. They are so boyant that they continue to pull off the 2 suction cups attached to the heater and having it float on the surface. I've tried additional suction cups though this is rediculous. Submersible heaters shouldn't float.
75malawi has used this product for 1-3 Years.
Overall Rating: 9.25/10 September 11, 2007
"Good experiences here"
Some of these horror stories scare me. I have had nothing but good luck with my various Theo heaters (200w, 300w, 400w). Most of them are > 1 yr old, and everything is great. The temperature readout at the top is inaccurate, but that's par for the course with any heater. Just use a thermometer as well, and adjust the heater accordingly.

Hope my luck continues.
galen has used this product for 1-3 Years.
Overall Rating: 8.5/10 August 5, 2007
"Very very good heater"
I bought a 100 watt heater for my 20 gallon tank 2 years ago. I tis still working today. It keeps the temps above 70 degrees cause I set it up that way- a temp. floor as the tank neevr got above 78 degrees but in winter temps would go down to below 60 in the house. It works perfectly. Only complaint is that the paint is beginning to peel off from the water. Recommended.
spartan.mike has used this product for 0-1 Month.
Overall Rating: 4.25/10 April 29, 2007
"....good for frying fish"
I turn it on and an hour later my tank rises 6 degrees. i returned it and got another heater, and the same thing happened.
Beaglegirl has used this product for .
Overall Rating: 1/10 March 28, 2007
"Liked at first, till fish fry"
I really liked this heater at first. Kept my tank constant temp for about 6 months. Then all heck broke loose. Came home from work, digital alarm was going off,(Thank GOSH I had an alarm on this tank) my tank was at 85! AND RISING(It had been constant 78 up till then.) I turned it all the way down, but it refused to shut off! Horrible! Up all night plugging dang thing in and out trying to keep my fish alive till morning and fish store opened. STINKY HEATER almost fried my fish!
inkedskin has used this product for 1-3 Months.
Overall Rating: 9/10 March 5, 2007
"doing a fine job here."
for the price i paid, this heater is great. my 100w is only 3 months old but I've had zero trouble. its easy to use and keeps the water within about 5 degrees of the setting on the high side. it may not be the best but its a good product from my experience with it.
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