300 Watt Heaters

Simple ideas often are the best ones, for example, the aquarium heater as a rod. The heating rod is simply hung in the water and heats it. It's true that principle is still the same as decades ago, but a lot has changed in the meantime. Today the JÄGER aquarium heater is an ultra-modern thermal device using the best available technology. Now - with in its new jacket of laboratory glass - it offers another an extra quality dimension.


The temperature can be precisely adjusted from 18° to 34°C and readjusted if required. The control accuracy is +/- 0.5°C.
The heat is controlled to a constant temperature. The heating function is indicated by an on/off control lamp
The heater can be fully immersed, is protected against running dry and is suitable for fresh or marine water.
The glass jacket enlarges the heating surface and ensures optimum even heat transfer. Thus, a smaller wattage than other brands will heat the same volume of water.
Jacket of laboratory safety glass

Reliable, precise, and easy-to-use aquarium heaters.

Tropical freshwater and marine fish require a stable temperature of around 24-27°C, in order to remain healthy and in good condition. The TetraTec HT range of heaters maintain a constant temperature via an in-built thermostat, making it easy to provide the correct conditions.

- Easy-to-set temperature control allows adjustments of 0.5°C, within range of 20°C - 32°C
- Extra long 2.5m mains cable for easy fitting
- Safet Shut-Off turns heater off if accidently run dry
- Can be fully submerged and positioned horizontally
- Electronic regulator for extra relability and safety
- Extra thick, heat-resistant borosilicate glass for peace of mind
- TUV/GS tested - safety and reliability assured


Suitable for 300 - 450 litres of water.

Visitherms are extensively recognised as one of the most accurate and reliable heaterstats available. Voted independently by the readers of Practical Fishkeeping in their last two reader surveys as the most widely used and the easiest to adjust heaterstat on the market.