"Pszemol" wrote in message
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"George" wrote in message
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"KurtG" wrote in message
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Tristan wrote:

Checkouty a sequence 1000 pump with sal****er seals.


Thanks. You put me on the right track.

If these are large submersibles, you should be aware that they can heat
up significantly at such high head loads. This could cause problems
with maintaining a proper tank temperature. Just something to consider.

Is there any relationship between the head pressure you use
the pump with and the amount of electricity it uses up ?

If so, I would guess the relationship would be that more head
pressure would cause LESS power consumption for the same pump.

I remember that this thing with submersible water pumps and power
consumption was going against the, so called, "common sense" ;-)

Most, if not all, submersibles rely on water flow for cooling. The more
head, the less flow, the less the pump is able to shed heat. So it heats
up internally (as well as the water it is sitting in) as the head
increases. Most pumps today can handle this heat (unless the pump is
deadheaded) to a point. Whether or not the critters in the aquarium can is
another matter altogether.

George