Jesse Joe wrote in news:d4rbo9$mjm$1@news-
int2.gatech.edu:

Joel M. Baldwin wrote:

To test them I placed them in a 5 gallon bucket filled with water
and turned them on overnight. The next morning, to my horror, when
I placed my hand in the bucket to feel the water flow I just about
got burned. The water was VERY hot, well over 100 degrees.


Well, look at it this way. On the nameplate it should say how many watts
of power they use. Think about heaters that use that many watts. Surely
that's too much to have on ALL the time in a five gallon tank. But is
thatt number a fair amount below the amount of thermostat-controlled
heating you have in the tank? If so, then I'd not worry, since the heat
effect is going to be like that of x-watt heaters (where x is what the
two pumps use) turned on all the time. I expect we're talking 60 watts
here, and I expect that a 60-watt, alone in that tank, would never turn
off on its own.

So really, don't sweat it. Your heaters might turn on a little less.
That's it :-)

--jjoe

Logical and reassuring, however I would have expected that a large portion
of that 60watts to be expressed as mechanical energy in the water movment,
not as thermal energy into the water.

Your explaination of needing less heater wattage as a result is useful
during the winter when the house is cold and the water needs to be heated,
but during the summer my house will be quite warm and a heater won't be
on very often. I may end up with a tank that is too hot.

I'm starting to think I should mount them inline rather than submerged.
And make sure that the sump area is WELL ventilated.