Lightobject EWP-DC30A1230 Mini DC Brushless Submersible Water Pump, Ideal for CPU Cooling, 3.6 L/Minutes

It moves a lot of water at 12v for it's size. Appears to be built well. I did not trust the sealing of the wires so I placed silicone sealant at the wire entry and it has not had any issues since.It would be nice if the wire leads were longer. The wire leads were about 2 feet long. I had to make sure to seal my solder joint when I extended the wires since they would be in contact with water.I tried adjusting the flow with PWM but that did not work. Any duty cycle under ~ 95% would just stop the motor. It does work fine at 5V though so I am running it at 5V because I did not need so much flow. At 12V it can be loud depending on the application, but it is really quiet at 5V.

This pump moves a lot of water quickly, which is not really what I needed for my project. It would be great in a closed system such as a cpu cooler. However, for my small scale evaporative cooler, it was not exactly idea. The pump wanted to move lots of water but didn't have the strength to suck the water up 12 inches. I had to submerge the pump and push the water up instead. This design change was a little annoying but doable. Now that it works, it's moving far more water than I need to. 4x or more.... Would be keen to find this exact same pump with less volume but more power. But for what it does, it's a good little pump.

I bought it to couple into an automotive heater core in a housing, for a couple of computer case fans (3.5", 45 CFM, 0.25A each) to make a low power requirement "air conditioner" for my boat. it oughtta be nice for days when its 100+ outside, we'll see.(its winter, drilling 2 holes into the bottom of a boat's hull is perfectly normal, right?) hopefully if the water temp is 65-70, it'll blow air 5-10 degrees warmer than that, 70-80 is lots nicer than 100+. it'd be a lot of cooling action for under 1 amp worth of battery drain-rate, and the whole project aint gonna cost 50 bucks in materials.(as friends say "gee why dont ya just jump in?", of course I'm just nutty enough to want more options.)when I tested the pump it threw a 15-16" high stream of water vertically without any tubing to confine or support it, what a mess and so what..I think this unit would be great for filling-draining-circulating a livewell too, it'll throw about a gallon a minute, which oughtta be plenty for applying like that, and it draws near nada to power it.its rated for some 20,000 hours worth of usage, means "forever!" to my intended applications here.a little pump like this could be used so many ways.**update** the low power lake temp "air conditioner" is a success, in the other boat as a livewell pump too. as a livewell pump it takes about 8-9 minutes to fill it, but the low energy usage for constant on circulation is nice enough when its full of fish. these pumps will SCREAM if they catch an air bubble to run dry, they do need to be submersed (or inside and below the waterline). the "AC" intake grabbing onto a leaf is just switching it off a few seconds for the leaf to fall away, has happened a couple times but not any kind of real problem. a change of shape for its intake maybe.

While I've yet to run this pump I did notice that the epoxy / water seal around where the wires exit the pump is poorly applied and does not appear to have sealed the motor compartment from water. Before running this pump I will need to apply some caulk or something similar to ensure water does not cause a short circuit when running it submerged. This may not be required but it's more for my piece of mind. It's a cheap pump so I'm not too surprised.

I ordered two of these pumps and they are perfect for the project I am working on. One thing I should have taken into account however, is that they will not work with my PWM speed control. They are either on or off. I worked around this problem and my guess is that my inexperience with speed controls is the reason I did not catch this first. That said,even if I knew in advance that the speed control would not work with the pump, I probably would have still ordered them. All that remains is to see how they operate in an actual application and if they last as long as they are reported to last.

Have been using these little pumps for home-made off-grid swamp coolers and outside garden fountains, and they have performed flawlessly. They use 5/16 inch inside diameter tubing, I use a section of tubing with holes cut into it and surrounded with screen, bounded with tie-wire for an intake filter, usually about 5" long. That seems to work to keep the beasties from getting to the impeller. Also, the current draw of less than 400 mA makes them ideal for small solar power fountains, and they really pump a lot of water. Experiments with variable voltage and current, at about 4 volts they stopped pumping, but even at 6 volts they pumped enough for my smaller fountain and swamp cooler.Also noticed that on the occasion that I boned it and it ran dry, didn't seem to cause any harm. This has happened several times on one pump. Makes a lot of noise, wouldn't recommend letting it happen, but it still works good.At 12 volts input, does seem to pump about 10' high, but for me try to keep it from working too hard, want them to last longer.These are NOT self-priming pumps. But they do just fine being submerged.Would not recommend using them in a closed-loop pressurized system. Keep the radiator cap loose or off if using it with such a system. Hope these notes help, these are really great pumps!