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Description
EHEIM thermocontrol 25 heaterWith the EHEIM precision heater, your fish will enjoy the perfect temperature in any aquarium. Diameter 36 mm Height 243 mm Performance at 50 Hz 25 Watt Max. temperature 34C Sea water Yes Min. temperature 18C Freshwater Yes Packing dimensions (Width) 6. 5 cm Packing dimensions (Height) 34. 5 cm Packing dimensions (Depth) 5 cm For aquariums up to approx. 25 Liter For aquariums of about 20 Liters Sometimes the simplest ideas are the most effective. Take
With the EHEIM precision heater, your fish will enjoy the perfect temperature in any aquarium. Diameter Ø36 mm Height 243 mm Performance at 50 Hz 25 Watt Max. temperature 34°C Sea water Yes Min. temperature 18°C Freshwater Yes Packing dimensions (Width) 6.5 cm Packing dimensions (Height) 34.5 cm Packing dimensions (Depth) 5 cm For aquariums up to approx. 25 Liter For aquariums of about 20 Liters Sometimes the simplest ideas are the most effective. Take the aquarium heater, for instance, which functions as a rod. This heating rod is simply submerged in the water to warm it. While the basic principle has remained unchanged for decades, significant advancements have been made since then. Today, the EHEIM adjustable heater is a state-of-the-art electronic heating device utilizing the latest technology. A jacket crafted from specialized laboratory glass enhances the heating surface, acts as a heat shield, and guarantees optimal heat distribution. Whether you need to heat a 20 or a 1000-liter aquarium, there are 9 sizes available to accommodate your needs. **Advantages of the EHEIM thermostatic heaters** - Accurate temperature adjustment from 18 to 34 °C - Easy and secure recalibration (±2 °C) - Temperature control precision of ± 0.5 °C - Maintains a consistent temperature - Heating function is signaled by a control light - Fully submersible (watertight) - Equipped with automatic dry run shut-off (Thermo Safety Control) - A glass jacket expands the heating surface and ensures effective, even heat distribution - Convenient cable length of approximately 170 cm - Comes with a double suction cup holder - Available in 9 sizes suitable for aquariums ranging from 20 to 1000 liters - Ideal for both freshwater and marine environments - Precision, user-friendliness, quality, and safety “Made in Germany” The EHEIM aquarium heater represents an evolution of the iconic heating rod. You can precisely set the temperature from 18 to 34 °C and recalibrate it as needed (±2°). The accuracy of temperature control is ± 0.5 °C, ensuring that the heat remains stable. The control lamp indicates when the heating function is active. This rod is completely watertight, can be entirely submerged, features an automatic dry run shut-off (Thermo Safety Control), and is compatible with both freshwater and saltwater. A key innovation is the glass jacket, which: - Expands the heating surface, - Concentrates the heat for optimal even heat distribution, and - Serves as a heat shield (safe to touch without harming your aquatic life). The jacket is made from specialized laboratory glass developed for research purposes, ensuring it is free from harmful pollutants that could leach into the water. It is resistant to chemical and biological substances and does not have any fissures or micro-cracks that could allow condensation to penetrate. Even extreme temperature fluctuations that may occur during water changes will not damage this durable glass.Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Durable and fun
Size: 4 Pieces, Size: 4 Pieces
I have a chewer who gets bored in the afternoon. She loves these Lego blocks. They’re sturdy enough for a big chewer and they hold her interest . She really enjoys figuring out how to get her breakfast!
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Reviewed in the United States on June 4, 2026
★★★★★ 3
Love the idea!
Size: 6 Pieces, Size: 6 Pieces
Love the idea of this product! Arrived 3/25/2026 and started using it the same day. Lab puppies (8 months old) loved it too, until one of the tabs was chewed off 😞
One of the puppies ate something (not this product) last week and was sick & finally threw up the rubber pieces he ate. So they can’t use the toys they love!
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Reviewed in the United States on April 1, 2026
★★★★★ 5
Get 8 pack for bigger / stronger dogs
Size: 6 Pieces, Size: 6 Pieces
This is the best puzzle toy i have found for my GSD mix. All around high quality product 10/10. Thick, durable rubbery material that holds up against a strong chewer. Individual pieces are big and bulky enough that i don’t have to worry about my bigger dog accidentally (or intentionally) swallowing a piece, so i don’t need to supervise.
That being said, if you have a bigger dog or a strong chewer, i HIGHLY recommend getting the 8 pack if you actually want to keep them busy for more than 20 mins consistently. Bigger dogs just have more leverage to tug on the pieces because obviously…they are bigger, so its just easier for them. The more pieces you add and more tangled/thicker you can make it, the less leverage they have and the harder it is for them to get a good grip.
I have a german shepherd/pitbull mix (big boi, v smart, v strong) and i initially got the 4 pack which, after the first few times, only took him about 5 mins to get all the pieces apart even with level 5 connections. So I ordered an additional 6 pieces (i have a total of 10 pieces now) so i could make it harder for him and it was totally worth it.
Now I use 8 pieces with level 5 connections and vital essentials freeze dried beef liver treats inside for my GSD and it consistently takes him 30+ mins to get the whole thing apart. I have timed this lol. I can rebuild the 8 pieces multiple different ways to make it more or less challenging (but i always opt for as difficult as possible to keep him entertained for as long as possible)
I use the other two pieces with a level 1 or 2 connection for my other dog- bordercollie mix who is not a very strong chewer, he mostly just rolls it around/ licks it until it finally opens or i help him.
Both of my dogs are obsessed with this. And i love watching them try to figure it out.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Awesome Tough Chewer Focus Puzzle
Size: 8 Pieces, Size: 8 Pieces
Our 2 yr old busy Mini Goldendoodle (24lbs) looooves this!
The material is super tough, yet malleable; he has chewed away and you can’t even tell.
We got the 8 pack, worth it! I load them all up with mostly kibble and a treat or two. It took just a short time for him to figure out how to really get it apart. On 1 it came apart really easy for him. We are mostly on 3s, with 2s. When he gets down to only 2 pieces connected it’s usually a 3 and it takes a little longer to get apart due to less leverage.
It is mostly easy to use but the higher the plug end is, the more effort it will also take for YOU to get it together. The numbers are a little hard to see, more so on the yellow over the blue.
If you use kibble like me, don’t fill it too full as then it won’t connect fully and be prepared for kibble to fly everywhere when they finally get it off. There are holes in the plug part, if you put something in it like peanut butter, remember to poke the holes out! Eew! Other than that they are fairly easy wash out in the sink!
Overall, this has become our go to, extended focus, quiet time, [essentially a] slow feeder!
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Great!
Size: 4 Pieces
I have a mini Australian Shepherd (37 lbs) and she loves this! She can get level one but has a tougher time with level 2. I have tried 3 but she gives up so she hasn't gotten further than that lol. She is quite stubborn and gives up easy if she can't figure something out and is totally over it. The quality is great as it is thick and not easy to destroy. My fur baby does love it, she seems to think it is fun for at least an hour so it is worth it in my eyes. There are times I have to do something that takes longer and I just can't play with her so this is perfect for her. It was definitely worth the money
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Reviewed in the United States on July 16, 2025