Buying a marine bilge pump comes down to two decisions: how fast the water has to leave and how much automation you want. In marine pumps plumbing sanitation, the range here runs from a compact 1100 GPH submersible to a 4700 GPH high-output pump. That 4700 GPH pump is in a separate flow class. The three smaller pumps share a 1100 GPH capacity but differ in included switch, hose fitting, and price.
Quick take
Need to move a lot of water quickly? The High-Performance 4700 GPH Marine Bilge Pump is the high-output pick. Want a float switch already on the pump? The 1100 GPH Marine Bilge Pump with Float Switch has it. Need a simple submersible near $10? The 1100 GPH Submersible Bilge Pump and the 1100GPH 12V Electric Marine Submersible Bilge Sump Water Pump are the two compact options.
Listed price comparison
| Product | Listed price | Price bar | What stands out |
|---|---|---|---|
| High-Performance 4700 GPH Marine Bilge Pump | USD 170.99 | 4700 GPH rating, 2-inch outlet | |
| 1100 GPH Marine Bilge Pump with Float Switch | USD 15.00 | Float switch included | |
| 1100 GPH Submersible Bilge Pump 12V Marine Boat Electric Water Pump 29mm Outlet | USD 9.99 | Lowest listed price | |
| 1100GPH 12V Electric Marine Submersible Bilge Sump Water Pump Boat 1-1/8 inch Hose | USD 10.00 | 1-1/8 inch hose fitting |
Decision matrix
- For rapid water removal: choose the High-Performance 4700 GPH Marine Bilge Pump. It is rated at 78.3 GPM with a 26.2 ft max head.
- For automatic operation: choose the 1100 GPH Marine Bilge Pump with Float Switch. The float switch is included, and the automatic bilge feature makes it a hands-free option.
- For a low-priced compact pump: choose the 1100 GPH Submersible Bilge Pump. It uses a stainless steel shaft and a water-cooled motor.
- For a hose hookup: choose the 1100GPH 12V Electric Marine Submersible Bilge Sump Water Pump. Its hose fitting is sized for a common bilge hose.
High-Performance 4700 GPH Marine Bilge Pump - 12V, Certified, Quiet Operation
At $170.99, this pump is the highest-priced option and the only one rated at 4700 GPH. It runs on 12V DC and includes a 2-inch outlet, a 17A current draw, 26.2 ft max head, and a 78.3 GPM flow rate. The 4.4-pound ABS housing and 3-foot wire lead round out the main specs. This is the pump for larger plumbing and situations where quick evacuation matters. The trade-off is the price and the 17A draw, which demands more from a 12V circuit than the 1100 GPH models. If your bilge area is modest, this capacity may be more than you need.
1100 GPH Marine Bilge Pump with Float Switch - Compact 12V Design for Boating
At $15.00, this pump costs more than the two basic 1100 GPH models, but it includes a float switch. Dimensions are 5.71 x 2.95 x 3.94 inches, so the design is compact. It draws 3.8 amps and works with a 6.0 fuse. The automatic bilge feature is built in, which removes the need to add a separate float-switch kit. It moves 18.33 GPM, putting it in the same capacity class as the other 1100 GPH pumps. The limitation is speed: 1100 GPH will not clear a fast-filling bilge as quickly as the 4700 GPH pump. For smaller boats and jet skis, this is a controllable choice.
1100 GPH Submersible Bilge Pump 12V Marine Boat Electric Water Pump 29mm Outlet
At $9.99, this is the lowest listed price in the group. It still offers a 1100 GPH rating, a 29mm (1-1/8 inch) outlet, 18AWG wire around 1 meter long, a stainless steel shaft, a thermoplastic body, and a water-cooled motor. Current draw comes in at about 8.5A. No warranty is stated, and batteries and wiring accessories are not included, so those are separate considerations. This is a compact submersible for a straightforward low-price installation.
1100GPH 12V Electric Marine Submersible Bilge Sump Water Pump Boat 1-1/8 inch Hose
At $10.00, this pump shares the same 1100 GPH output class as the other compact models. Its main identity is the 1-1/8 inch hose fitting, which makes it easy to match to a standard bilge hose. The pump is a submersible 12V unit, designed around direct removal of bilge water. The limitation is capacity: at 1100 GPH, it is not built for the rapid evacuation of the 4700 GPH model. For a simple marine installation where the hose size is already 1-1/8 inch, this is a direct fit.
Final recommendation by use case
- For high-volume bilge removal: choose the High-Performance 4700 GPH Marine Bilge Pump.
- For automatic operation: choose the 1100 GPH Marine Bilge Pump with Float Switch.
- For the lowest listed price: choose the 1100 GPH Submersible Bilge Pump 12V Marine Boat Electric Water Pump 29mm Outlet.
- For a hose-ready compact pump: choose the 1100GPH 12V Electric Marine Submersible Bilge Sump Water Pump.
