Marineland shatterproof stealth 200w heater

  • We are currently upgrading MFK. thanks! -neo

screaminleeman

Jack Dempsey
MFK Member
Nov 27, 2009
1,445
10
38
Westminster, MD
Another brand heater not just stuck on, but overheat!

I am confused. The stealth 200w is rated for up to 55G. That is what I had it in. I do weekly 50% water changes and daily feedings. The tank normally ran between 82 - 84 degrees F, to house warm species fish. There were a school of four clown loaches (~ 3 - 4"), a silver dollar @ 3", a black ghost knife @ 5" and a baby Jaguar cichlid @ 3" (growout).

I fed my fish one evening, and all was fine. The next evening was the water change day. When I stuck my hand with the gravel vacume in the tank, it was extremely hot. I couldn't believe that the fish could live in there. When I looked closely THEY WERE NOT! I have a B.S. stick on digital thermometer that maxes around 100F and the temp was off that scale. The dial on the heater does not go into triple digits!

In the past, when I have had (numerous) other brand heaters that stuck on, I just put them in tanks WAY bigger then they were capable of heating along with a fully functional heater. That would keep the functional heater to have to work less often and have not had issues to date.

Three questions.

1. How can a 200W heater raise the temperature of a tank that is of it's maximum possible function to such an extremely high temperature (especially within 24 hours)?

2. Considering some malfunction occured rather then a simple "stuck on" condition, it appears that lower wattages are able (and higher wattages NOT required) to heat tanks. Why is the technology not going in this direction? (It sure would be nice to heat your 22G tanks with a 50W heater!)

3. Is the usage of stuck heaters in tanks WAY bigger then they are rated for bordering on retardation on my part? 19 tanks with less then a handful of cool water native tanks is costly to replace the extremely common occurance of the "stuck" phenomenon!
 
just get an Eheim Jager :)

seriously though, heaters are still the subject of much debate.

a 200w heater is capable of heating a 55g to lethal levels if it never shuts off.

lower wattage heaters ARE capable of heating smaller tanks than you would think, but they stay on all the time in doing so.

in general, 3-5w per gallon is one of many 'rules of thumb' that peopel will tell you, with the lower wattage figure for the larger tanks (because once heated up to temperature larger volumes of water take longer to cool down than smaller ones) and the higher wattage figure for the smaller tanks (again, beacause the temp. will fluctuate more in a smaller volume of water when the heater is not on).

at least this is how I understand it.

I use 3w per gallon, generally using two smaller heaters.

for example, I use twin 250w on my 165g and it works very well. I use Eheim Jagers.
 
oversized heater -> takes less time to heat a given water volume -> more frequent on/off cycles -> more rapid failure of the bimetal thermostat -> heater sticks on.
 
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