I don't know what type. My dad borrowed it from work. Basically it sits between the wall and PC and tells you the voltage, power, frequency, watt-hours, etc.
I didn't calibrate it, but I did try it with a few lightbulbs and it was within a degree or two of their rated wattage (which should itself vary), so I think its fairly accurate.
Anyway it was really interesting. I could see power vary with CPU ussage, monitor brightness, even spining up the CDROM.
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Of course the pump power requirements will be variable. The exact power requirement will depend on the flow rate, the pressure and the mechanical efficiency of the pump. Operating close to one end of the pump's performance curve will cause the pump to draw less power... it's peak consumption is typically near its peak efficiency.
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I know that. But keep in mind, a larger pump will operate even farther to the side, so it should use an even smaller faction of its rated wattage. Or at least i would not expect it to increase in effciency by getting increasingly backpressured.