RENA Submersible Heaters has a temperature control mechanism which is computer-calibrated in water. The top light excel features illuminated temperature readings on both top and side of heater, plus a 500-micron solid-silver contact thermostat eliminates contact welding that causes overheating. RENA Submersible Heaters have a high thermal diffusion for quicker, more efficient aquarium heating. When choosing the correct size heater, a standard rule is to use five watts per gallon of water.
My 300W lasted almost a year, but the thermostat was VERY inaccurate and I would have expected this heater (in a 90g) to last longer. It broke on me, overheated, and cost me a fish! I won't buy another one.
I have a 300 Watt heater and it seem to hold the temp just fine. Its about 3 deg off, but once you get it set it works good. Love the way it hides well in the back of the tank. Its not the best heater for the price but still one of the better ones.
I have a 50W RC in a 10G tank. The problem i've experienced is that the temp is always higher than where i set it at. I had to set the dial at 70F in order for the tank to be 78F. It has stayed at that temp since but the dial/thermostat is inaccurate and i had to figure out on my own that it had to be set lower than it reads.
I've had mine for 2 weeks now. Temp is all over the place. Set dial temp at 76, actual tank temp 81.7, room temp is 75. Adjusted setting down to 72. Heater light came on with tank temp still above 81. Most inaccurate, unreliable product I've purchased in years. I'm taking it back today.
Before, I use a Visi-Therm Heater (100w). But it leak water inside after 2 months use. So I replace this Rena Cal Top 150w. I like it! Very good builted and fancy look. Keep temp constant. I am so happy. But, the temp setting is not accuracy. I set on 71F but give me 73F. 2 degree difference.
Had one that would NOT shut off! After six months in operation it actually got 'stuck' in the ON position. Not good - and fortunately, no fish got fried. The other one has been in a sump for 14 months - and has given me no problems....... yet.
One day I noticed that my Rena heater wasn't working so I took it out and at the bottom the glass fell of.It was really bad and my temp. was at 70 degrees.the cheaper Hagen heaters work way better and I would never suggest this heater to anyone!
This is my second RenoCal heater. The first one broke to my doing. Did a water change and forgot to take it out (I did not have it sumerged), and just shattered. Kinda cool actually! So I had to get another one, and now I have this one sumerged completely. Never had to touch it yet! Adjusting the temperature is tricky as first, but you have that with any heater. Just follow the directions and you'll be fine. Highly recommend this product.
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