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Most Recent Questions
Recent Question:
SKU: 1379011 which is the 8 1/2 in. length heater. What is the diameter of the length of the heating element?
Recent Question:
Can a 100 watt heater be used for a 55 gallon tank?
Recent Question:
I purchased a 50w today, and it has been running for about 10 hours. There is condensation forming inside of the tube near the top. Is this normal?
Recent Question:
I bought the heater 3 days ago and my water seems to be way to warm for my tiger barbs. I have two of them in a 1.5 gallon tank. what should i do?
Questions with Most Recent Answers
Question:
SKU: 1379011 which is the 8 1/2 in. length heater. What is the diameter of the length of the heating element?
Question:
Can a 100 watt heater be used for a 55 gallon tank?
Question:
Would this heat a 3 gallon tank well?

Customer Questions & Answers for
Hydor Hydor THEO (UL) Submersible Aquarium Heater

Patented PTC heating system guarantees safe operationFish tank water heater suitable for freshwater, marine and tropical aquariumsMade from specially engineered shatterproof glassHighly accurate micro-switch technology keeps temperature to within +/- 1°FMay be vertical or horizontal – suction cups secure the aquarium water heater's position in your tankCompletely submersible unit – power cord measures 6 feet in length
Customer Questions & Answers:
8 Questions,
 | 
9 Answers
Overall Rating:
3.778 out of 5
3.8
out of
5

Questions & Answers for Hydor Hydor THEO (UL) Submersible Aquarium Heater

Question

Hello i bought this heater, the light turns on for a few seconds and then it turns off? Is it broken?

asked 1 year, 9 months ago
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by
andipad
on Hydor THEO (UL) Submersible Aquarium Heater
-1point
0out of 1found this question helpful.
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2 answers
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answer 1
It is auto regulating the temp. That is perfectly normal. Use a thermometer to verfiy the water is at the temp you want.
answered 1 year, 7 months ago
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by
TekVu
OK
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0out of 0found this answer helpful.
answer 2
Test it by putting the heater into a pitcher of cool water, adjusting the dial to the temperature you want and leaving overnight. Check the next morning for accuracy. Remember you do not want to change the temperature of the water too quickly or it will stress the fish, therefor the heater may be cycling on and off for that reason... I thought the same thing but have had it in the tank for several days and it is maintaining right at the set temperature.
Best Answer
answered 1 year, 9 months ago
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by
walkinmomma
Laporte, PA
+1point
1out of 1found this answer helpful.
Question

Does this heater come with more than one suction cup clip?

Just wondering if, for stability reasons, if this heater (25w) comes with at least 2 suction cup clips to secure to aquarium side while in use in a horizontal orientation. I currently have a different brand heater that is secured with a single clip and it moves around too much for my liking.
asked 2 years, 10 months ago
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by
bettabeauty
on Hydor THEO (UL) Submersible Aquarium Heater
+2points
2out of 2found this question helpful.
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answer 1
It comes with 2 suction cups
Best Answer
answered 1 year, 9 months ago
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by
walkinmomma
Laporte, PA
+1point
1out of 1found this answer helpful.
answer 2
Yes, the 25w hydor comes with 2 suction cups and can be secured in a horizontal or vertical position.
answered 2 years, 5 months ago
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by
swhite304
The Dalles, OR
+1point
1out of 1found this answer helpful.
Question

battery operated?

Do you need to plug in the heater or is it battery operated? Is there any battery opreated heater?
asked 3 years, 7 months ago
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by
Nanette
San Francisco
on Hydor THEO (UL) Submersible Aquarium Heater
+2points
5out of 8found this question helpful.
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2 answers
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answer 1
It is an electric heater
answered 1 year, 9 months ago
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by
walkinmomma
Laporte, PA
0points
1out of 2found this answer helpful.
answer 2
You have to plug this one in. But I highly recommend this heater. Check out my preview on the product page.
User submitted photo
Best Answer
answered 3 years, 6 months ago
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by
animalloverjuly
Augusta, GA USA
+1point
3out of 5found this answer helpful.
Question

What is length in inches of Theo-150 Aquariom heater

asked 3 years, 8 months ago
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by
BobA5
on Hydor THEO (UL) Submersible Aquarium Heater
+7points
9out of 11found this question helpful.
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1 answer
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answer 1
Product Dimensions: 3.5 x 2 x 10 inches
Best Answer
answered 3 years, 5 months ago
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by
Zatharas
0points
1out of 2found this answer helpful.
Question

What is the length of the 25 watt heater for a 2 gallon tank?

asked 2 years, 4 months ago
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by
cellofish
on Hydor THEO (UL) Submersible Aquarium Heater
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1out of 1found this question helpful.
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answer 1
About 7" total I have about 6" in the water-there is a line to indicate the correct water level on the heater.
Best Answer
answered 1 year, 9 months ago
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by
walkinmomma
Laporte, PA
+1point
1out of 1found this answer helpful.
Question

what temperature can you get out of it

asked 2 years, 10 months ago
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by
Barracuda101
on Hydor THEO (UL) Submersible Aquarium Heater
+2points
2out of 2found this question helpful.
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1 answer
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answer 1
The dial ranges from 67 to 91*.
Best Answer
answered 1 year, 9 months ago
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by
walkinmomma
Laporte, PA
+1point
1out of 1found this answer helpful.
Question

is this product good for acuatic turtles?

3 inches yellow belly sliders 2-turtles and i have a 20 gallon tank filled with 10 gallons of water is this a good produt for them?
asked 2 years, 8 months ago
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by
DiDi21
Allentown,PA
on Hydor THEO (UL) Submersible Aquarium Heater
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Question

Does the dial show the temperature setting in Fahrenheit of Celcius?

asked 1 year, 3 months ago
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ndohvu
on Hydor THEO (UL) Submersible Aquarium Heater
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