So I purchased this heater for my 3 gallon Eclipse tank and would like to share my experiences so far. This is the submersible unit, apparently they also make a non submersible unit.
Heats up the tank nicely. Currently the tank is at a nice 80ºF
Small enough to fit in my tank without having to angle it in.
Adjustable. Not a preset unit.
Limited lifetime guarantee.
Cheap. Only cost me $20 with tax from my local pet shop. Available cheaper online.
Noisy. When it senses that it needs to heat the water the pilot light flickers for a bit and makes a buzzing/vibrating noise. Once the light is steady the noise goes away.
No temperature indicator marks on the adjustment dial. You just have to guess, and use a thermometer to monitor the tank temperature. It has been plugged in for 24 hours, but it has crept up from 79º this morning to about 80.5º as of this writing. I have turned the dial down a bit as I'd prefer the water to be at 79º but the manual claims that it takes 12 hours for the unit to adjust each time you turn the knob.
lifetime guarantee. I have saved the original packaging and receipt just in case, and will be registering the heater ASAP