Originally Posted by jeffaquarius
I would say it's just a matter of elimination which component on your tank is producing abnormal heat. If you have a Ground Probe in your tank, remove it and measure how much stray voltage from water in tank to ground. If you are using more than one house receptacle to power your equipment and happens to be on different circuits the stray voltage will heat up your tank.
i'm sorry but this info is wrong. unless these outlets are on different ends of the house you don't have to worry about, even in those rare occations you still dont
also stray voltage in the water as far as i'm concerned is a load of ****, when you understand how electrical circuits work you will realize that one grounded is when you will cause problems if left alone your livestock will be at the same potential and will be harm free. a grounding prob will turn your tank into one giant piece of wire that will be the center of a dead short and kill everything that is in it as a ground will carry the voltage back to the neutral in your panel and return to the source of where it came from, this being the transformer that is located outside your house on a pole or infront of someones house.
if any voltage actually makes it to your water you have a bigger issue and you will notice it as soon as you toucked the water as you'd get a blast an a half. if people think that the powerheads will cause voltage being an inductive load then you are wrong also, it will cause magnetic lines of flux that will need a coil to generate any sort of voltage.
so again a grounding probe is a waste of money and anyone who tells anyone other wise is throwing a sales pitch to make a few extra bucks
if you're worries about electricity killing you or your lives stock, then get a GFCI and arch fault breaker and call it a day, this will help prevent any for of arching in the circuit and any sort of leakage of current to ground
PS: i'm an electrician and i do this every day of my life