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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  1 3 - View all
mohinder has used this product for 3-12 Months.
Overall Rating: 1/10 April 16, 2007
"These run about 10 degrees too high! BEWARE."
I bought three of these from Pet Solutions when I bought a new tank, and they were sold out of Ebo Jager heaters. They are compact and fairly cheap. But, all of them run about 10 degrees too high. I set them at around 78 degrees, but the water measured at 88 degrees. ALL THREE OF THE HEATERS RAN TOO HOT, AND I COULDN'T GET THEM TO RUN COOLER. Be careful, and stick with a Jager (formely Ebo Jager) heater instead.
Kuettle has used this product for 0-1 Month.
Overall Rating: 3/10 August 1, 2006
"Returned After 1 day"
Bought one for my 110G. Set the temp for 80 checked temp a few hours later had gone up to 84, turned it down to 76 and checked later temp had risen to 86. I turned it down all the way and after about 15 minutes touched the heater and practically burned my hand. Wounld not shut off. Total POS don't waste your money.
chefjimmy has used this product for 1-3 Months.
Overall Rating: 3.75/10 July 14, 2006
"i am replacing 6 now"
i purchased 6 of these heaters, right around the same time, and within 2 months 4 of them are just running on there own. the dial is set at 75 and i noticed the temp was climbing and the light was not going off. it got up to 85 degrees, and i had enough. none of them are even close to accurate.
mbunakeith has used this product for 3-12 Months.
Overall Rating: 6.25/10 May 11, 2006
"works great, when it works."
i graded it high for effectiveness because when it works, it is great. i have 3 of these (100w, 150w, 200w) and my 100w konked out on me after only 6 months. the temp would slowly go up and i would turn the heater down to compensate for it and it would be fine for a couple days. finally after about two weeks of this constant fidgeting, it just gave up on itself. it just wouldnt turn on anymore. my others are newer and seem to be working good so far. i graded low on ease of use because if want 80 degrees, you have to set it to 75 or so. dial seems to be off. it's too bad because i think the hydor inline heaters (eth300) are the best heaters ever. i went with the hydor glass style for my smaller tanks because i use HOB's on them.
mike01c has used this product for 1-3 Years.
Overall Rating: 10/10 May 5, 2006
"no problems"
I haven't had any problems with this heater. I have a 50w for my 10gallon. It's been accurate. My apt has been as cold as 58 degrees and still this maintained the water at 78 or above. I've been using it for a yr. I bought it because it was the smallest 50w on the market.
DaddyWiehe has used this product for 0-1 Month.
Overall Rating: 8.5/10 April 28, 2006
"Great deal..."
I bought two of these a few weeks ago and they are running great. Easy to adjust and to read the settings. Would recommend shopping around for best price them can be costly. My 400 watt was norm. $45 at petsmart but on thier site it was $35 so i picked up two cheaper than the rest they had to offer.
stelow has used this product for 0-1 Month.
Overall Rating: 4.5/10 April 12, 2006
"Buyer beware"
The worst heater I ever purchased. It was not working right brand new from the box. I retuned it for a refund.
dabigmandan has used this product for 1-3 Years.
Overall Rating: 1.5/10 March 15, 2006
"Terrible, worst heaters I've had"
I've had 2 Hydor Theo's. A 200watt and a 300 watt. Both Had the same problems. THEY WOULD NOT SHUT OFF! One was only a year old when it started to malfunction and the other was only 3 months old!. Do not buy this heater. Worst heaters on the market.
waterways has used this product for 1-3 Years.
Overall Rating: 10/10 March 14, 2006
"Great Heater at Good Price"
I have many large cichlid tanks and each one of them has Hydor Theo heaters. For the simple reason they keep the water temp super accurate, never a problem with it. You pretty much just set it and forget it. On top of that I have large fish that in the past have distroyed old heaters. Not these one bit. Some of them have been beaten up pretty good by some pretty big fish and not one once of damage on any of them. So a definate yes for this heater, espically if you have larger fish!
Miles43 has used this product for 1-3 Months.
Overall Rating: 9/10 March 2, 2006
"Very good heaters"
Great accuracy. Highly recomended if can get at the right price.
straitjacketstar has used this product for 1-3 Months.
Overall Rating: 9/10 March 2, 2006
"Great heaters"
Have about 5 in differn't tanks. All great. They keep the temp. w/in 1 deg. acc.
pcworks has used this product for 0-1 Month.
Overall Rating: 8.25/10 February 10, 2006
"Price was right but dial not accurate"
I have had this heater for about 3 weeks or so. IT took a little messing around with the setting to get it right. Its set at about 75 to get 79. But once set my temp does not fluctuate. So for the price I would say its ok.
rna has used this product for 1-3 Months.
Overall Rating: 7.75/10 January 25, 2006
"disappointment"
i've searched for a small heater to put in my ac500(sw use) and this was the smallest 100w heater i could find. the first one i bought, got scared because the light would never go off. the second one i bought set it at 79F and it would heat to 85F, next one did the same, and te next did the same too.

i would just compensate for the difference, but other than that, the heater is small and compact. and it also holds the temp very well, very constant.

mixed review about this heater.
brianp has used this product for 0-1 Month.
Overall Rating: 4/10 January 24, 2006
"Unstable and unreliable"
Installed two 400 watt Theo heaters on a 150 gallon tank and set each at 79 degrees. Watched the temp jump around within a 3 degree range. Then set back to 78 and watched the temp climb to 80 degrees. Then set back to 76 and the heaters were still turning on.
brutus8 has used this product for 3-12 Months.
Overall Rating: 7.5/10 March 10, 2007
"Solid Heater"
This is a good heater for the money. The only bad thing I can say is that the water temp is a little cooler than what my heater is set on, but other than that it is pretty good.
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