SKU: 23659247811

EHEIM thermocontrol 300 heater

Sale price$166.45 Regular price$184.95
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Ships within 48 hours · Estimated delivery Sep 15 - Sep 20

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Description

EHEIM thermocontrol 300 heaterWith the EHEIM precision heater, your aquatic friends will enjoy the perfect temperature, no matter the aquarium size. Diameter : 36 mm Height: 506 mm Performance at 50 Hz: 300 Watt Max. temperature: 34C Sea water: Yes Min. temperature: 18C Freshwater: Yes Packing dimensions (Width): 6. 5 cm Packing dimensions (Height): 58. 5 cm Packing dimensions (Depth): 5 cm For aquariums up to approx.: 1000 Liter For aquariums of about: 600 Liters Simple yet

With the EHEIM precision heater, your aquatic friends will enjoy the perfect temperature, no matter the aquarium size.

  • Diameter Ø: 36 mm
  • Height: 506 mm
  • Performance at 50 Hz: 300 Watt
  • Max. temperature: 34°C
  • Sea water: Yes
  • Min. temperature: 18°C
  • Freshwater: Yes
  • Packing dimensions (Width): 6.5 cm
  • Packing dimensions (Height): 58.5 cm
  • Packing dimensions (Depth): 5 cm
  • For aquariums up to approx.: 1000 Liter
  • For aquariums of about: 600 Liters

Simple yet effective ideas often yield the best results. Take the aquarium heater, for instance, designed as a rod that hangs effortlessly in the water to provide warmth. While the basic principle has remained unchanged for decades, significant advancements have occurred since then. The EHEIM adjustable heater is now a state-of-the-art electronic thermal device equipped with the latest technology. Its jacket, crafted from specialized laboratory glass, enhances the heating surface, acts as a heat shield, and ensures optimal, uniform heat distribution. Whether you need to heat a 20-liter or a 1000-liter aquarium, you have 9 sizes available to choose from.

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 steady heat level
  • Heating function indicated by a control lamp
  • Fully submersible (watertight)
  • Automatic dry run shut-off feature (Thermo Safety Control)
  • A glass jacket enhances the heating surface and guarantees optimal heat distribution
  • Convenient cable length of approximately 170 cm
  • Includes double suction cup holder
  • Nine sizes suitable for aquariums ranging from 20 to 1000 liters
  • Appropriate for both fresh and marine water

Precision, user-friendliness, quality, and safety — all “Made in Germany.” The EHEIM aquarium heater represents an evolution of the classic heating rod. You can precisely set the temperature between 18 and 34 °C and calibrate it if needed (±2°). The temperature control accuracy is ± 0.5 °C, ensuring consistent heating. A control lamp indicates when the heating function is active. The rod is completely watertight, can be fully submerged, and features an automatic dry run shut-off (Thermo Safety Control), making it suitable for both freshwater and saltwater environments. A key innovation is the glass jacket, which:

  • Expands the heating surface
  • Concentrates heat for optimal, even distribution
  • Acts as a heat shield (safe for your aquatic life)

The jacket is made from high-quality laboratory glass, designed for research use, ensuring it is free from harmful pollutants that could leach into the water. It is resistant to chemical and biological substances, and its construction prevents any fissures or cracks that could allow condensation to infiltrate. Even significant temperature changes during water changes will not harm 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:
  1. 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
SKU: 23659247811

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4.1 ★★★★★
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Yolanda
Louisville, US
★★★★★ 5
Cooling Blanket for Hot Sleepers, Soft Lightweight Comfort with a Cool-to-the-Touch Feel
This reversible cooling blanket is a great option for anyone who sleeps warm. It’s incredibly soft, very lightweight, and has that instantly cool-to-the-touch feel that makes it especially comfortable for hot sleepers. What I liked most is how airy and breathable it feels without being heavy or stuffy. It’s comfortable enough to use all night and gives that nice cooling sensation when you first pull it over you. The softness also makes it feel cozy without sacrificing the lightweight design. My only real wish is that it came with a matching pillowcase, because that would make it feel even more complete as a sleep set. Pros: Extremely soft and comfortable Cool to the touch Lightweight and airy feel Great for hot sleepers Breathable without feeling heavy Cons: Does not include a matching pillowcase Verdict: If you tend to sleep hot, this is a really nice lightweight cooling blanket. It’s soft, breathable, and comfortable with a refreshing cool feel. I just wish it included a pillowcase to make the set feel complete
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026
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Verified Purchase
Bata
Houston, US
★★★★★ 4
Cool & comfy
Color: Dark Gray Seersucker, Size: King(108"x90")
Cool but not as cold as I wanted Very soft and comfy though
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Reviewed in the United States on April 29, 2026
L
Lola D.
Draper, US
★★★★★ 5
Cooling Blanket is a sleep saver for me!
This is the second product I have used from bedsmile and as with the other one, this is a great product! It truly is a cooling blanket. I am a very hot sleeper and live in a hot, humid climate, so this has been a sleep saver for me! One side is silky smooth and feels so good on your skin. The other side has a texture to it which is great if you want to use it as your only bedding, which I do. It covers well and hangs over the edges as it should. I ordered the white one and it is bright and unblemished. The silky side magically feels much cooler than typical bedding and keeps me cooler during the night. It is lightweight but heavy enough to make you feel that you are "under the covers". In my opinion, putting additional covers over it would defeat the purpose but if you live in a cooler climate, it would still be beneficial to use this blanket as the silky coolness would help get a good night's sleep anywhere. Another great benefit of this product is that it does not have any strange odors when unpacking. I did wash it before using, but honestly, I am not sure it was necessary.
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Reviewed in the United States on March 20, 2026
P
Verified Purchase
Paubla Maya
Omaha, US
★★★★★ 5
Incredible Value - Soft, Stays in Place, and Military Son Approved!
Size: California King, Size: California King
I purchased this mattress topper for under $27 and I'm so impressed that I'm planning to buy another one! Easy Installation & Perfect Fit: This topper was incredibly easy to put on, and it fits my California King mattress perfectly. The 18-inch deep pockets ensure it stays in place - I can move around on the bed and it doesn't shift at all. Comfort: The topper is wonderfully soft and has made a noticeable difference in our sleep quality. My husband absolutely loves it, and we both wake up feeling more rested. The Ultimate Test: My son recently came home after being deployed for a year. He slept on our bed for hours and immediately commented on how soft and comfortable it was. That's saying something for someone who's been sleeping on military accommodations! He was so impressed that he's planning to buy one for his ship. Bottom Line: For the price, comfort, and quality, I recommend this 100%. It's hypoallergenic, stays in place, and has exceeded all our expectations. You can't go wrong with this purchase!
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Reviewed in the United States on November 5, 2025
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Verified Purchase
Pat Onstott
Belleville, US
★★★★★ 5
Nice mattress Topper Pad
Size: Queen
Met my expectations and was just as advertised. Good fit; comfortable.
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Reviewed in the United States on April 20, 2026

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