| | |  | Heaters | Home » » » » Hydor THEO Submersible Aquarium Heater 400W UL | | | | | | | Description: | | Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product. | | | Features: | |
• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry
| | | Product Details: | | | Product Length:
| 3.5 inches | | Product Width:
| 2.0 inches | | Product Height:
| 18.0 inches | | Product Weight:
| 0.85 pounds | | Package Length:
| 16.6 inches | | Package Width:
| 3.4 inches | | Package Height:
| 2.1 inches | | Package Weight:
| 0.85 pounds | | Average Customer Rating:
|  based on 13 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
 ( 13 customer reviews )
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Most Helpful Customer Reviews
16 of 16 found the following review helpful:
 Hydor Theo Submersible Aquarium Heater 400w ULJan 12, 2011
By angie
I have a 125 gallon fish tank and it was hard to find a heater that could keep the water warm with the right price. I went to different pet stores to price a heater it was less watts and more money. I purchased a aquarium heater from another source in which i was very dissatisfied, it worked 3 weeks and stopped. I decided i would give it one more try, so i order the Hydor Theo Submersible Aquarium Heater 400w UL from amazon and i have been very pleased with it. I did find out it is always better to get anything electrical with the UL (certified by Underwriters Laboratories) which is government approved. I would highly recommend this product also i am very pleased with Amazon's service.
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3 of 3 found the following review helpful:
great heater!Mar 08, 2011
By roytoy
got this not too long ago and so far it was been awesome! I have it as the lone heater fully submerged in my 90 tank and it heated up the tank pretty fast. its been consistantly at 82f with no fluctuations at all. would recommend to anyone with a large tank
2 of 2 found the following review helpful:
Great Heater!Mar 31, 2011
By Gene
I have a 100 gal tank. I needed to add a heater that would be dependable, safe, and easy to use. The Hydor Theo 400w heater has exceeded my expectations. I highly recommend this heater.
1 of 1 found the following review helpful:
 Theremostat broke?Apr 20, 2012
By CantSpliceThis
I got this product used, but I tested and it does heat. Problem is, it doesn't stop heating. I have a 72 gallon tank, and I set it to 80. THe tank stayed steady at 85 or 86!!!
I lowered thermostat to 75, now 72. Still at 86 and about 87 at the peak of the day!!! Not sure if it was used and abused, but damn, thats too hot. Will not get same brand.
1 of 1 found the following review helpful:
 its heats but thats itJan 26, 2012
By Karl
this heater does not shut off when required . i am tryin to maintain a 80 degree temp but i currently have heater set to 77 and water temp is 81-82 degrees . Im sure once i find the correct setting it will work great but the settings are worthless
See all 13 customer reviews on Amazon.com
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