Eheim Thermocontrol E Fish Aquarium Heater

By Eheim
Rated 3.5556 out of 5 stars


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$52.99Chewy Price
In Stock
FREE 1-3 day delivery

About This Item


  • Comes with a convenient 5.5-foot-long plug-in cable, a double suction cup holder to securely place the heater anywhere in the tank and an easily visible control lamp that shows red for "heating up" and green for "temperature reached".
  • The heater is durable and impact resistant.
  • Suitable for both freshwater and saltwater aquariums!
  • Offers precise temperature adjustments.
  • Designed with a glass jacket that increases the heating surface area for optimal emission.

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Fish TypeMarine Invertebrate, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterBetta, Cichlid, Goldfish, Marine Fish, Tropical FreshwaterTropical Freshwater
Aquarium TypeSaltwater, FreshwaterSaltwater, FreshwaterFreshwaterSaltwater, FreshwaterSaltwater, Freshwater
MaterialPlasticPlasticPlastic, PolypropylenePlasticPlastic

Questions & Answers

3 Customer Questions

What are the tank sizes for each wattage option?
Answer by ChewyMar 07, 2023
The 75 watt is recommended for 5.5 – 13 Imp (6.6 – 15.8 US gallons), the 100 watt is recommended for 22 – 33 Imp (26.4 – 39.6 US gallons), the 150 watt is recommended for 44 – 66 Imp (53 – 79 US gallons), the 200 watt is recommended for 66 – 88 Imp (79 – 106 US gallons), the 250 watt is recommended for 88 – 132 Imp (106 – 159 US gallons) and the 300 watt is recommended for 132 – 220 Imp (159 – 264​​​​​​​ US gallons).

What is the length of the heater?
Answer by ChewyDec 07, 2022
The 75 W heater is approximately 10.23 inches long, the 100 W is approximately 12.16 inches long, the 150 W is approximately 13.18 inches long, the 200 W is approximately 15.59 inches long, the 250 W is approximately 17.4 inches long and the 300 W is approximately 19.52 inches long.

What is the lowest you can set it to?
Answer by ChewyMar 13, 2023
This heater has a temperature range of 20-32 degrees Celsius (68-90 degrees Fahrenheit).

ReviewsWrite a Review

Rated 3.5556 out of 5 stars
9 Ratings
Would recommend to a friend

9 Customer Reviews

Rated 1 out of 5 stars
By MattK on Nov 13, 2023

fading quality

Have always had excellent experiences with Eheim products in the past. The last 3 aquarium heaters that I purchased, only lasted on average 2-3 months. Either the pilot,(on-off) light doesn’t ever come on, when heating, or when the pilot light, stays on, but the heater, never heats up. But, I still keep buying them. When you get a good one, it will last forever!

Rated 1 out of 5 stars
By Roy on Sep 21, 2023

Inferior Product

I struggled for months with the temp. It was up and down all the time. Decided to discard this heater. Purchased a Marineland for half the price and it works perfectly.

Rated 4 out of 5 stars
By MarkA on Jun 10, 2023

Reliable. Using as a "Back-up"

I've had the best luck with Eheim aquarium heaters (100-300w) in both Fresh water and Marine Reef setups over the years for this price range. Temperature stability has been great. I like the green and red LED feature that lets you know at a glance that the heater is heating (red) or in Stand-By (green). No lights would be a problem. All heaters fail depending on the environment & maintenance but the Eheim's have lasted the longest for me.

Rated 1 out of 5 stars
By Pooh on Apr 5, 2023

300w eheim

I'm concerned as I have bought more than 2 of these heaters. It appears the stay on the red light most of the time. I imagine x2 heaters pulling 600w is keeping my light bill high. I need to return as they are not doing the job that is needed for my discus tank.

Rated 5 out of 5 stars
By JG on Mar 20, 2023

Works great

I got this heater for my 20 gallon aquarium and it quickly got the water up to temperature. I like that the knob to adjust the heat settings is on the top and easily accessible. Good product.

Rated 5 out of 5 stars
By Agata on Apr 12, 2023

Very good buy

Slick design its fully submersible and very accurate temp setting

Rated 5 out of 5 stars
By Ginger1 on Jan 24, 2023

Works Great

Red/green light display lets me know temp is accurate. Tropical fish in this 20 gal love it.

Rated 5 out of 5 stars
By Shellyy on Nov 20, 2022

Great Heater

Holds the temperature perfectly, love that it is fully submersible and has a dry-run fail safe. Easy to install and set temperature.

Rated 5 out of 5 stars
By Hippiefarmer on Nov 2, 2022


Works great in my 55 gallon tank. I love it!!!!!!!!