Hydor Micro & Mini Aquarium Slim Heater, 15-watt

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$15.29 (-10%) Chewy Price
$16.95 List Price
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About This Item

Details

  • Specially designed for micro tanks and mini aquariums.
  • Helps maintain the ideal temperature and natural warmth that fish like guppies and bettas need.
  • Simply plug in the heater, no complicated set up.
  • Shock-proof design and the ability to run safely when dry.
  • 7.5 W heater measures 5-1/2" x 2-1/2" and heats 2 to 5 gallons of water.

Instructions

FAQ

Learn More About Hydor From Our Team of Experts

Questions & Answers

6 Customer Questions

Cam I use it underneath the fish bowl, meaning OUTSIDE of it?

Answer by Chewy • Dec 21, 2018
This is intended to be submerged in an aquarium.

Why can't I keep it under a light I keep on 24/7?

Answer by Chewy • Jul 05, 2018
The Mini Heater should not be used in aquariums positioned close to air conditioning outlets, in direct sunlight, near sources of heat, or under a source of light that is kept on for long periods of time. This can alter the temperature of the heater.

Can this heater be used outside my fish bowl underneath it?

Answer by Chewy • Oct 30, 2025
This heater should only be used submerged in water. It should not be placed under or outside the bowl, as it could overheat and damage itself.

Is this battery operated or plug?

Answer by Chewy • Apr 06, 2024
This product is not battery-operated and works with a plug and play.
Reviews
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3.8
Rated 3.8 out of 5 stars
36 Ratings
Terms & Conditions

32 Customer Reviews

Rated 5 out of 5 stars
By blank on Feb 2, 2019

awesome for small fish tanks

it works like a charm and my tank heated up in no time. I would definitely recommend.

it works like a charm and my tank heated up in no time. I would definitely recommend.

Rated 2 out of 5 stars
By Sarah on Dec 28, 2018

Didn't hear my tank as I thought it would

I have a 1.5 -2 gallon tank with a beta fish and for how this heater is rated for bigger tanks it barely brought my tank up to a Luke warm temperature and if this

I have a 1.5 -2 gallon tank with a beta fish and for how this heater is rated for bigger tanks it barely brought my tank up to a Luke warm temperature and if this can be used on bigger tanks I don't see how it can heat the water appropriately wen it barely warms my little tank I'm kind of sorry I bought this product but nothing I can do now

Rated 3 out of 5 stars
By Macey on Dec 21, 2018

Hydor Micro & Mini Aquarium Slim Heater

I'm not sure if there was something wrong with the one I received but it doesn't work at all. I've had it plugged in for over 12 hours and the water hasn't gotten

I'm not sure if there was something wrong with the one I received but it doesn't work at all. I've had it plugged in for over 12 hours and the water hasn't gotten any warmer.

Rated 5 out of 5 stars
By Sara on Sep 8, 2018

He loves it!

Since we got this heater, Squidward the Betta fish is so much more active.

Since we got this heater, Squidward the Betta fish is so much more active.

Rated 4 out of 5 stars
By Tammy on Jun 24, 2018

Good product

It's working very well. I have a 5.5 gallon fish tank. It works perfect for my small tank.

It's working very well. I have a 5.5 gallon fish tank. It works perfect for my small tank.

Rated 4 out of 5 stars
By Cassy on Jun 11, 2018

Good for the price

This heats my 3 gallon tank very well. The only thing I don’t like is that there’s no stopping point for the heat level. When I first put it in and came home from

This heats my 3 gallon tank very well. The only thing I don’t like is that there’s no stopping point for the heat level. When I first put it in and came home from work, my fish tank was at 85 degrees and I normally keep it around 78. The fish were fine but it frightened me a bit to realize it could potentially have been bad.

Rated 4 out of 5 stars
By Kendra on Apr 1, 2018

Decent heater

This is a decent heater for very small tanks. Not good for anything more than 2 gallons but good for small betta tanks.

This is a decent heater for very small tanks. Not good for anything more than 2 gallons but good for small betta tanks.

Rated 5 out of 5 stars
By Fishtank18 on Mar 19, 2018

Working, No issues

Seems to be working so far, I've had it plugged in for a few days now, temperature fluctuates between 80-81 degrees in 8 gallon tank with no other heat source.

Seems to be working so far, I've had it plugged in for a few days now, temperature fluctuates between 80-81 degrees in 8 gallon tank with no other heat source.

Rated 2 out of 5 stars
By DebiGag on Feb 27, 2018

Doesn't do what it claims

This heater claims that it will keep your tank water at about 6-7 degrees warmer than the room temperature. NOT. My house stays around 68 degrees and the tank stays

This heater claims that it will keep your tank water at about 6-7 degrees warmer than the room temperature. NOT. My house stays around 68 degrees and the tank stays around 70-71. Waste of money. Need to go buy a "regular" adjustable heater.

Rated 5 out of 5 stars
By Stevue on Feb 13, 2018

Heats Up My Bettas Water Excellent

This heater helps a lot after about an hour or less, it heated up my tank to about 78 degrees it is really quick and efficient.

This heater helps a lot after about an hour or less, it heated up my tank to about 78 degrees it is really quick and efficient.