Kasper N.
Great
18th April 2019
![Hydor - External heater](https://www.aquasabi.com/media/image/product/3573/md/hydor-externer-regelheizer.jpg)
Hydor - External heater
Works perfectly fine, temperature is stable; easy to attach to the filter hose. A must have if you want to avoid seeing a heater inside the aquarium.
Aivis K.
Must have!
10th March 2017
![Hydor - External heater - 300 W - 17 mm](https://www.aquasabi.com/media/image/product/3576/md/hydor-externer-regelheizer-300-w-17-mm.jpg)
Hydor - External heater - 300 W - 17 mm
Good quality for this price. I am exited from the item realy .Thank you aquasabyi for fast delivery to Latvia!
Gintare C.
Stable and easy to use
23rd December 2018
![Hydor - External heater](https://www.aquasabi.com/media/image/product/3573/md/hydor-externer-regelheizer.jpg)
Hydor - External heater
Keeps really stable temperature. Just finding difficult to clean as in and out flow opening smaller than inside. Nice not to see a heater in the tank