found the same problem 300 W (4 year old) heater was sticked and killed some of mine discus fishes. i sended a complain to Rena , that heater does not do what has been promised. The leaflet promised that overhaeting and sticking is prevented by a 500 micron silver coating. will be kept updated on reaction of RENA. positive or negative R.Mens Beverwijk

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300w or 2 150w
by lukmek

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Advantages: Vital Equipment
Disadvantages: Can break if not careful

If you are planning to keep tropical fish then you are going to be in for a shock at how much it actually costs to get set up and running. One thing you will have to think about buying is a water heater to keep your fishes warm. This 300W heater wil ... Read review

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Good op! x x x Jo x x x by J4M1721

A good review, L x by flufftier

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Advantages: only one unit for large tanks
Disadvantages: may stik and boil your fishes!

Rena has a very good reputation on aquarium equipment and their 300w heaters are a good buy, good build quality and in most cases very good value for money. the heat element is sealed and in case of an accident would not be realised in the aquarium, ther ... Read review