I wonder how often user error causes a heater (or other equipment) to fail and then that user complains of the quality of the item
I wonder how often environment/usage affects the products performance and then that user complains of poor quality of the item
I have one aquarium that started fluctuating temperature this summer. I quickly noticed the AC vent blows directly on the tank. Direct sunlight can also impact temperature. I wonder how often are such things overlooked.
It makes sense to me that using a heater that is too large for the aquarium would cause the heater to click on and click off far more often then necessary. It then makes sense that such a heaters on/off control would wear out prematurely
As even after the heating element is turned off, a heater still retains hot for a bit, it makes sense using an oversized heater would cause the tank to continue heating up after the heater turns off thus making the temperature fluctuate.
It is suggested to put the heater in the water for a bit to allow the thermostat adjust before plugging the heater in
Not doing so is bound to affect the performance
Stealth heaters claim once functioning they can be removed from water and will automatically turn off. I have not put this quality to the test but I have heard many state they do not turn off as suggested. It is very simple to work around this and I seriously wonder what percentage of the failures are related to this particular malfunction.