Hydor Theo Shatterproof Aquarium Heater
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About This Item
Details
- A fully submersible, shatter-proof glass aquarium heater.
- This heater is shock resistant thanks to the patented PTC heating element and the shatterproof glass tube.
- The supplied suction cups allow you to position the heater anywhere in your aquarium. You can place it in the fish tank vertically, horizontally and fully submerged.
- If heater senses abnormal functioning, the patented PTC heating system guarantees completely safe operation in case of dry running.
- This universal aquarium heater may be used in freshwater or marine water fish tanks.
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| Customer Rating | |||||
| Price | $22.99Chewy Price | $16.00Chewy Price | $29.83Chewy Price | $28.22Chewy Price | $34.32Chewy Price |
| Fish Type | Marine Fish, Marine Invertebrate, Tropical Freshwater | Betta, Cichlid, Goldfish, Marine Fish, Tropical Freshwater | Marine Fish, Tropical Freshwater | Marine Fish, Tropical Freshwater | Marine Invertebrate, Tropical Freshwater |
| Aquarium Type | Saltwater, Freshwater | Saltwater, Freshwater | Freshwater | Freshwater | Saltwater, Freshwater |
| Material | — | Plastic | Metal, Stainless Steel | Plastic, Polypropylene | Plastic |
7 Customer Questions
32 Customer Reviews
Be Cautious
Ordered because I wanted a heater for my 5 gallon tank that I could adjust. I didn’t read all the reviews. My experience was similar to most of theirs. I set the heater to 79 and went to bed. Next morning I found it had heated to 84. First, I adjusted it to 75, but it still wanted to turn on. So, I unplugged the heater and waited several hours for the water to cool down to 79. Then, I turned the heater setting to 68 and plugged it back in. Over the course of 2 hours, I turned up the heater setting a degree or two until I knew it was keeping the water a consistent 79. That setting, for me, was 75. For looks, I love it. It’s slim and modern. Price was great. But, just be aware of it’s possible issues and keep an eye on it until you’re confident it’s working properly.
Stuck on one Temp
This aquarium heater worked great for a few months. The design and appearance are great, but after a while I noticed that even if I had it on its lowest setting (68) it kept my tank was stuck at 82 degrees F... didn't hurt the fish at all, but had I owned fish that enjoyed a slightly cooler temp, I would've been in trouble.
waste of money
My experience with this product was very DISAPPOINTED after buy 4 units "1 per aquarium" fully submerged in less then 2 months 3 units just burn . I call the manufacturer and they have a only 30 days guaranty. And the last unit is a PAIN,,NEVER KEEPS THE RIGHT TEMPERATURE,,NOT A RELIABLE BRAND!!!!!
I don't trust other heaters
Sad they seem to be phasing them off of Chewy. They are all I use and so far they always seem to maintain the correct temps.
Works perfectly
Keeps my betta’s 5-gallon Fluval tank at 78 degrees without the need for adjustment and fits inside the back compartment with the filter motor.
Bad quality
Went through 2 in about a year, they power on but around 6 months you will see burnt spots on heater glass and it won't heat the water anymore.
Perfect for bettas
It’s a great heater for small tanks, and the best part is that it’s adjustable which is hard to find in small heaters.
Stopped Working
Got two of these the other day to replace the old ones I had(different brands) and suddenly they both stopped working. Both are in separate tanks and both tanks have dropped back down in temps...
Very Wrong
I had heater turned as low as possible and it still registers 86 degrees. 16 degree difference. If you love your fish please don't buy this heater. I switched to the tetra which has never let me down.
Aquarium heater
I bought two of the 25 watt heaters for my 3.5 gallon Betta tanks. It's difficult to find a good, adjustable heater for a small tank. It did take a couple days to get the water up to 80 degrees, but that's probably because I keep my home on the cool side (66-68 degrees) in the winter. I've only had the heaters a couple weeks, but I'm very happy with them. The only thing I would change is there is no indicator light to show when the heater is on.
