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Tetra Second Nature Submersible Heater

Item # HN-JEN027

Dimensions & Specifications

Pet Type
Fish & Aquatic Pets

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  • Thermostat automatically maintains aquarium temperature
  • Easy to conceal aquarium heater
  • Perfect for smaller aquariums
  • Requires no adjustments
  • Thermostat maintains the water temperature at 78-degree F
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Customer Reviews


by PowerReviews
Tetra Second Nature Submersible Heater

(based on 9 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 9 customers

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Displaying reviews 1-5

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bearly heats a 5 gallon

By freshwateraquatics

from Russellville, KY 42276, USA

Comments about Tetra Second Nature Submersible Heater:

Tetra heaters have to be the worse heaters ever, I have the 30 to 60 gallon heater and it keeps my tank at 56degrees in my 5 gallon, I've bought several of them and they have all been terrible


Why get any other brand

By Fishboyoutofwater

from Undisclosed

Comments about Tetra Second Nature Submersible Heater:

It works just as good as any other heater if not better and it is half the price


Worked great, for a single week.

By GratefulDiver

from Sturgis, MI 49091, USA

Comments about Tetra Second Nature Submersible Heater:

One week old and no longer heats water. 40 degree (F) water and LED stays green...


5 gallon tank reads at a solid 76F

By BabyMamaCT

from Wethersfield, CT, USA

Comments about Tetra Second Nature Submersible Heater:

I have kept fish since I was a kid (I am now 38) and just purchased a 5 gallon tank for my 4 year old daughter's birthday. I purchased the Tetra Sub Heater suitable for a 2-15 gallon tank which touted to keep the temp at a balmy 78F. I also placed the stick on tank thermometer at the furthest point away from the heater as to glean the correct reading. After running the tank for 12 hours with ya-ya brand filter (size suitable for said tank size with a med-low flow) in a perfect location, in a dark corner, no direct sunlight, empty tank of course being new etc etc... my reading is at a solid 76F. I guess I am writing this because I have a 5 gallon tank and this is my reading. If I had the 10 or 15 gallon tank, 15 being the max this heater is rated to handle..not sure where my reading would be.. Food for thought I guess.


This heater is garbage!!!!

By Gunsmoke

from Chickasaw, AL, USA

Comments about Tetra Second Nature Submersible Heater:

This is my second heater in the last month. The first one we had the light came on one time and went right out an never came on again. We purchased another one and the light never came on.

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