The Fluval "M" 300 watt submersible heater is quality manufactured in Europe using superior components and construction. This sleek, compact Fluval heater can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval "M" series the reflective technology helps maintain the aquariums' natural look as the heater reflects the colors of the surroundings. aquariums and can be used in fresh and saltwater tanks.
I thought this heater would be fully submersible. It is not. The top needs to be out of the water. With the lip of the top around my aquarium to hold the glass top on it makes it impossible for this heater to work. Plus, I do not keep the water line down below the top trim. Very disappointed. Still don't have fish as I still need to go out and buy another heater. :(
Easy to use by NotNick01/01/2014
My old heater that I was replacing did not have an actual temperature gauge on it. This fluval I set to about 75/76 and in 3 hours the 55gallon tank was at 77 degrees and has stayed that way for the last 3 weeks. Seems to hold the temperature. Works fine