Mini Submersible Water Pump
Small 5V submersible pump for irrigation and fountain projects.
A low-voltage submersible pump commonly used in automated plant-watering systems, mini fountains, and liquid-cooling loops.
Specifications
| Operating voltage | 3V - 6V DC (5V typical) |
| Current draw | ~130-220 mA at 5V — more than a GPIO pin can source directly |
| Flow rate | ~80-120 L/hr at zero head height, model-dependent |
| Max lift height | ~40cm-1m typical for this size of pump |
| Duty notes | Submersible, brushed DC motor — not rated to run dry; running without water in the reservoir will burn out the motor |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | + | Positive lead — through a transistor/MOSFET or relay driver, never straight from a GPIO pin |
| 2 | - | Negative lead — common ground with the driver circuit |
Drive through an NPN transistor or logic-level MOSFET (with a flyback diode across the motor) or a relay module — the pump's current draw exceeds what any microcontroller GPIO pin is rated to supply.
Variants
A submersible pump is the right choice whenever the liquid needs to be actively lifted or circulated, like watering a plant from a reservoir below it. If the goal is precisely metered small volumes (nutrient dosing, pH adjustment) rather than just moving water, a peristaltic pump trades flow rate for much better accuracy. If the liquid is already pressurized and you only need to start/stop the flow, a solenoid valve does that job without a pump at all.
| Variant | Price |
|---|---|
| Mini submersible pump (this listing) | ~$2-5 |
| Peristaltic dosing pump | ~$6-12 |
| Solenoid valve (5V/12V) | ~$3-8 |