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Description: Tetra whisper 20 is a Hang-on heater of 100 Watts. It was also know as Tetra Challenger 100.

It features a dial (+ / -) on top, protected with a plastic cover.
 

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Discussion Starter · #2 ·
I think this product is discontinued from Tetra, however my LFS still has plenty in stock.

I couldn't get a stable temperature in my 10 gallon tank. In the instruction manual, it says you have to check the water temperature every hours and adjust the dial accordingly. I guess I have other things to do! :D

Rating1
Proslow price for power (100W),
Consdial: very hard and long to set up, temperature not stable
Would you recommend?no
 
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