![Tetra Adjustable Heater HT | 25 watts / 50 watts / 75 watts / 100 watts / 150 watts / 200 watts / 300 watts Tetra Adjustable Heater HT | 25 watts / 50 watts / 75 watts / 100 watts / 150 watts / 200 watts / 300 watts](https://www.aquaristikshop.com/pictures_xxl/118312.jpg)
Tetra Adjustable Heater HT | 25 watts / 50 watts / 75 watts / 100 watts / 150 watts / 200 watts / 300 watts
![50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares 50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares](https://tetra-spares.co.uk/wp-content/uploads/2022/08/MF319-300x300.jpg)
50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares
![50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares 50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares](https://tetra-spares.co.uk/wp-content/uploads/2022/08/GD049.jpg)
50w Pre-set Heater for 54L Starter Line Tank - Tetra Spare Parts | Get your tank running again with aquarium spares
![My Tetra 20-30 gallon submersible heater light keeps turning on and off. It's pre-set temperature is 79 degrees, and my tank is at 75. It is a new heater. I put it My Tetra 20-30 gallon submersible heater light keeps turning on and off. It's pre-set temperature is 79 degrees, and my tank is at 75. It is a new heater. I put it](https://external-preview.redd.it/7IaeTciIzU3qCPiPbY8J01WLmXR9ak7VXyKASN8fAXA.png?format=pjpg&auto=webp&s=28b397423ef5a9f85d425bbce20dd805321c7f49)
My Tetra 20-30 gallon submersible heater light keeps turning on and off. It's pre-set temperature is 79 degrees, and my tank is at 75. It is a new heater. I put it
![Tetra Adjustable Heater HT | 25 watts / 50 watts / 75 watts / 100 watts / 150 watts / 200 watts / 300 watts Tetra Adjustable Heater HT | 25 watts / 50 watts / 75 watts / 100 watts / 150 watts / 200 watts / 300 watts](https://www.aquaristikshop.com/pictures_xxl/118309.jpg)