I have begun to plan a solar water heater for the spa/hot tub that came with the house I've recently acquired. I am thinking of trying to use a pump that is powered by a 12v/24v DC brushless motor with the following specs: Code: [LIST] [*][COLOR=Red]Power: DC12~24V[/COLOR] [*][COLOR=Red]Current: 3.5A@24V, 1.6A@12V[/COLOR] [*]Output: 40.0L/m (635 GPH) @24V or 380GPH @ 12V [*]Pressure: 9.3psi @24V [*]Motor: DC 3 phase coil, more torque and quiet [*][COLOR=Red]Power: 84Watt/ 19.2Watt[/COLOR] [*]Speed control(3 wires): 0-5V analog [*]Intake: G1/2 (1/2") [*]Outlet: G1/2 (1/2") [*]Vertical lift: 6.5m (21ft) [*]Life span: > [COLOR=orange]20,000hrs[/COLOR] @ 1600rpm~10,00rpm [*]Noise: << 38dB [*]Working Temp: 100'C/ 212'F (non-submersed) [*]Envir Temp: <50'C [*]Size(L*W*D): See "More images for the exact dimension" [*]Weight (net): 21.0oz [/LIST] The amps - wattages for the 12/24v applications seem a bit screwey. I'm wondering if they might have mixed up the amperage requirements, if 3.5A@24V & 1.6A@12V might more accurately be 1.6A@24V & 3.5A@12V. Then, the wattage requirements would change from 84Watts @ 24v & 19.2Watts @ 12v to 42 watts @ 24v and 38 watts @ 12v. Those numbers seem to be a bit more reasonable to me. But then, my electrical knowledge is skimpy to say the least. Anyone out there with enough knowledge to confirm or deny my feeling about this?