Hydor THEO Submersible Aquarium Heater 50W UL

by Hydor

Product Features

• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry

Product Details

• Product Dimensions: 3.5 x 2 x 10 inches ; 9.6 ounces
• Shipping Weight: 9.6 ounces (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• ASIN: B00061UQ6G
• Item model number: T11102
• Average Customer Review: 4.1 out of 5 stars  See all reviews (8 customer reviews)
• Amazon Best Sellers Rank: #3,698 in Pet Supplies (See Top 100 in Pet Supplies)
  • #23 in Pet Supplies > Fish & Aquatic Pets > Aquarium Heaters

Product Description

Theo Heater. New aquarium heater functioning with the exclusive PTC technology means that this heater will not break or damage when run out of the tank. Theo aquarium heater has all the necessary feature for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of components guarantee a long lasting product.

Customer Reviews

Most Helpful Customer Reviews

6 of 6 people found the following review helpful:

4.0 out of 5 stars Hydor THEO Submersible Aquarium Heater 50W UL (, November 21, 2010

By 

chelma (ny) - See all my reviews

Amazon Verified Purchase

This review is from: Hydor THEO Submersible Aquarium Heater 50W UL (Misc.)

It is a good heater. I think the temp might be a little off. i have it at the highest setting and the thermometer says 77 degrees, but it is in a very cool room

5 of 5 people found the following review helpful:

4.0 out of 5 stars Works well so far..., November 21, 2010

By 

BipRoberts - See all my reviews

This review is from: Hydor THEO Submersible Aquarium Heater 50W UL (Misc.)

Just bought the 50W model for my 10G tank. I set it to 79 degrees, and the thermometer agrees to this *exactly*, even on the weak side of the tank away from the filter.

I know that I haven't had it long, but so far, so good.

UPDATE: 2 months in, it still heats well. The ambient temperature in the room has an effect on it, but the temp is staying +/- 2 degrees from 80. For a $20 heater, I'm satisfied with that.

2 of 2 people found the following review helpful:

5.0 out of 5 stars Nice compact size, accurate, stable, January 3, 2012

By 

Carolyn (Twin Cities, Minnesota) - See all my reviews

Amazon Verified Purchase

This review is from: Hydor THEO Submersible Aquarium Heater 50W UL (Misc.)

I ordered this heater because the one I already had was a little too bulky for my 5gal tank. It has been running for several weeks now and the only problem I've had is it runs about 3 degrees F above the setting but it is very consistent with the temp. I like how small this heater is without sacrificing wattage, I like the dial on top that has actual degree settings, I also like that there is an on/off light. I would recommend this heater.