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Water in the bilge is the quiet problem on any boat, and it only announces itself when the hull sits low or the floorboards feel damp. The short answer to what is bilge pump is that it is a small submersible pump that sits in the lowest part of the hull and moves water overboard before it builds up. This guide explains how it works, what the flow and lift figures mean, and how the pumps below compare on the figures the makers state.
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What is bilge pump: how it moves water
A bilge pump is a submersible pump that sits in the bilge, the lowest part of the hull where water collects, and pushes that water out through a discharge hose. The pump runs on 12V DC from the boat battery, and a float control or a manual panel control turns it on when water rises. The SEAFLO listing states a 12V DC pump with anti-airlock protection and a stainless steel shaft, and the 6699 listings state pure copper motors with low energy consumption. Flow is measured in gallons per hour, or GPH, and lift is measured as max head or max delivery height, so a 2000 GPH pump with a 16.4 ft head moves more water higher than a 750 GPH pump with a 9 ft head.
Flow, lift and current: reading the figures
Flow, lift and current are the figures that decide whether a pump fits the boat. Flow in GPH says how much water the pump moves, and the listings here state 2000 GPH, 1500 GPH and 750 GPH. Lift says how high the pump can push water, and the listings state a 16.4 ft max head for the SEAFLO pump (on Amazon), a 19.7 ft max delivery height for the 2000 GPH 6699 pump, and a 9 ft max delivery height for the 750 GPH 6699 pump. Current says how much the pump draws from the battery, and the listings state 8.5A with a 14.0A max draw for the SEAFLO pump and 7.5A for the 2000 GPH 6699 pump. A pump with higher flow needs a battery and wiring that can carry its current, so match flow, lift and current to the boat and the battery, not flow alone.
Controls, outlets and hoses
A bilge pump needs a control, an outlet and a hose. The SEAFLO pump works with manual panel controls and automatic float controls, so it can run by hand or by itself when water rises. The 6699 pumps include a stainless steel clamp for the discharge hose, with a 1-1/8 inch outlet on the 2000 GPH pump and a 19 mm outlet on the 750 GPH pump. The SEAFLO pump has a 1-1/8 inch outlet too, with a 14 AWG wire lead of 3 feet. Match the hose to the outlet size, and keep the hose run short, since lift is lost to height and to hose length.
| Pump | Flow | Lift | Current | Amazon |
|---|---|---|---|---|
| SEAFLO 2000 GPH Bilge Pump | 2000 GPH | 16.4 ft | 8.5A | View on Amazon |
| 6699 2000 GPH Bilge Pump | 2000 GPH | 19.7 ft | 7.5A | View on Amazon |
| 6699 750 GPH Bilge Pump | 750 GPH | 9 ft | Not stated | View on Amazon |
| Rule 1500 GPH Bilge Pump | 1500 GPH | Not stated | Not stated | View on Amazon |
Where a bilge pump fits
A bilge pump fits any boat that takes on water, from a fishing boat to a yacht, and the 6699 listings name fishing boats, cruisers, runabouts, yachts, skiffs, fish tanks and RVs as uses. The 750 GPH pump suits kayaks, canoes and small boats, where a small pump and a shallow sucking level matter more than raw flow: its lowest water sucking level is 0.2 inch, and its lowest pump starting level is 0.4 inch. The 2000 GPH pumps suit larger boats with more bilge water to move, and the SEAFLO pump adds certification and a 4-year warranty for boats that stay in saltwater. Pick the pump by the size of the bilge, the height the water must climb, and the battery behind it.
Bilge pumps for a boat
The pumps below cover the flow, lift and control parts of the job above, so match GPH, head and current to the boat.
| # | Product | Solar Score | Buy |
|---|---|---|---|
| 1 | SEAFLO 2000 GPH Bilge Pump | 9.7/10 | Buy on Amazon |
| 2 | 6699 2000 GPH Bilge Pump | 9.6/10 | Buy on Amazon |
| 3 | 6699 750 GPH Bilge Pump | 9.5/10 | Buy on Amazon |
| 4 | Rule 1500 GPH Bilge Pump | 9.5/10 | Buy on Amazon |

SEAFLO 2000 GPH Bilge Pump
A 2000 GPH submersible bilge pump with anti-airlock protection, CE and RoHS certification, and a 4-year limited warranty.
Pros
- 2000 GPH flow with a 16.4 ft max head
- CE and RoHS certification stated
- Anti-airlock protection keeps water flowing
- 4-year limited warranty stated
Cons
- 8.5A current with a 14.0A max draw, higher than the 7.5A 6699 pump
- Wire lead of 3 feet, shorter than the 3.3 ft cord on the 750 pump
- No float control is included
- Dimensions of 6.4 by 5.2 by 4.5 inches need a larger bilge space than the 750 pump
Detailed Review
The listing states a 2000 GPH bilge pump at 12V DC with a 1-1/8 inch outlet, 8.5A current and a 14.0A max draw, a 16.4 ft max head, and a 14 AWG wire lead of 3 feet. It lists anti-airlock protection, a stainless steel shaft, marine-grade wiring and moisture-tight seals, and states CE and RoHS certification, plus a 4-year limited warranty. The pump works with manual panel controls and automatic float controls, and measures 6.4 by 5.2 by 4.5 inches.
Who it's for: boat owners who want a certified pump with a long warranty for saltwater and freshwater use. Who should skip it: owners who need a longer wire lead or a smaller pump for a tight bilge.
Its Solar Score of 9.7/10 comes from performance 32/35, build 22/25, value 21/25, safety 9/10 and warranty 3/5: 87 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 2000 GPH, 12V DC |
|---|---|
| Head | 16.4 ft max |
| Current | 8.5A, 14.0A max draw |
| Outlet | 1-1/8 in |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. CE and RoHS certification stated, so safety scores 9 of 10. 4-Year Limited Warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 3 of 5. See How We Pick.
Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

6699 2000 GPH Bilge Pump
A 2000 GPH bilge pump with a 1/10 HP copper motor, a 19.7 ft delivery height and a stainless steel clamp included.
Pros
- 2000 GPH flow with a 19.7 ft max delivery height, the highest stated here
- 7.5A current, lower than the 8.5A SEAFLO pump
- Stainless steel clamp included for the discharge hose
- Pure copper motor with low energy consumption, as the listing states
Cons
- No warranty term is stated
- No certification is stated
- Max grain size of 1/50 inch limits debris the pump can pass
- Lowest water sucking level of 2/5 inch leaves water below that level
Detailed Review
The listing states a 2000 GPH bilge pump at 12V and 7.5A with a 1/10 HP motor, a 1-1/8 inch outlet, a 19.7 ft max delivery height, a max grain size of 1/50 inch, a lowest pump starting level of 4/5 inch and a lowest water sucking level of 2/5 inch, and a 3.1 ft power cord. The body is impact-resistant ABS thermoplastic with a pure copper motor, and a stainless steel clamp is included for the discharge hose. The listing names fishing boats, cruisers, runabouts, yachts, skiffs, fish tanks and RVs as uses, and gives dimensions of 5.1 by 4.3 by 6.0 inches.
Who it's for: boat owners who want high flow and high lift at a low current draw. Who should skip it: owners who want a stated warranty or stated certification before buying.
Its Solar Score of 9.6/10 comes from performance 32/35, build 21/25, value 21/25, safety 7/10 and warranty 0/5: 81 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 2000 GPH, 12V, 7.5A |
|---|---|
| Head | 19.7 ft max |
| Motor | 1/10 HP, pure copper |
| Outlet | 1-1/8 in |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Impact-resistant ABS thermoplastic body stated, so safety scores 7 of 10. No warranty term, so warranty scores zero. See How We Pick.
Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

6699 750 GPH Bilge Pump
A 750 GPH bilge pump with a 1/15 HP copper motor, a 9 ft delivery height and a stainless steel clamp included.
Pros
- Small size with a 3.57 by 2.77 by 4.25 inch body for tight bilges
- Stainless steel clamp included for the discharge hose
- Pure copper motor with low energy consumption, as the listing states
- Lowest water sucking level of 0.2 inch picks up shallow water
Cons
- No warranty term is stated
- No certification is stated
- 750 GPH is the lowest flow in this group
- Max delivery height of 9 feet is the lowest stated here
Detailed Review
The listing states a 750 GPH bilge pump at 12V DC with a 1/15 HP motor, a 19 mm outlet, a 9 ft max delivery height, a max grain size of 1/50 inch, a lowest pump starting level of 0.4 inch and a lowest water sucking level of 0.2 inch, and a 3.3 ft power cord. The body is ABS with an exclusive moisture-tight seal and a pure copper motor, and a stainless steel clamp is included for the discharge hose. The listing names fishing boats, cruisers, runabouts, yachts, skiffs, fish tanks and RVs as uses, and gives dimensions of 3.57 by 2.77 by 4.25 inches.
Who it's for: owners of kayaks, canoes and small boats who want a small pump for shallow water. Who should skip it: owners who need more than 750 GPH or a higher lift than 9 feet.
Its Solar Score of 9.5/10 comes from performance 28/35, build 20/25, value 20/25, safety 7/10 and warranty 0/5: 75 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 750 GPH, 12V DC |
|---|---|
| Head | 9 ft max |
| Motor | 1/15 HP, pure copper |
| Outlet | 19 mm |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. ABS body with exclusive moisture-tight seal stated, so safety scores 7 of 10. No warranty term, so warranty scores zero. See How We Pick.
Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

Rule 1500 GPH Bilge Pump
A 1500 GPH submersible bilge pump with a 90 day warranty and little else stated in the listing.
Pros
- 1500 GPH flow, 5678 Lph, as the listing states
- 12V submersible design
- 90 day warranty stated
- 3.1 pound weight stated
Cons
- No max head, current or outlet size is stated
- Material type of Canvas stated, which does not match a submersible pump
- No certification is stated
- 90 day warranty is shorter than the 4-year SEAFLO warranty
Detailed Review
The listing states a 1500 GPH bilge pump at 12V, 5678 Lph, with a 90 day warranty and a weight of 3.1 pounds. It states almost nothing else: no max head, no current, no outlet size and no construction detail. The listing also states a material type of Canvas, which does not match a submersible pump body. The spec table gives dimensions of 5.25 by 6 by 4.5 inches, which read like a conversion artifact rather than a measured size.
Who it's for: boat owners who want a Rule pump at 1500 GPH and accept a thin listing. Who should skip it: owners who want stated head, current and outlet figures before buying.
Its Solar Score of 9.5/10 comes from performance 28/35, build 19/25, value 19/25, safety 4/10 and warranty 1/5: 71 of 100 points, placed on our 9.2 to 9.8 scale.
Key Specifications
| Flow | 1500 GPH, 5678 Lph |
|---|---|
| Voltage | 12V |
| Warranty | 90 days |
| Weight | 3.1 pounds |
Taken from the seller's listing on 13 November 2026. Capacity and output figures are rated by the manufacturer.
Safety and Warranty
What this listing states. Submersible design stated, so safety scores 4 of 10. 90 days warranty stated. It does not say everything a buyer needs, such as who pays return shipping, so warranty scores 1 of 5. See How We Pick.
Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.
This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.
As an Amazon Associate I earn from qualifying purchases.
How the pumps were scored
The Solar Score weighs performance, build, value, safety where it applies, and warranty. Safety here means stated certification, submersible design and seals that keep water out of the motor. The SEAFLO listing states a 4-year limited warranty, and the Rule listing states a 90 day warranty, while the 6699 listings state no warranty term. The site guide to picking explains the weights.
FAQ: power away from the grid
What is a bilge pump?
A bilge pump is a small submersible pump that sits in the lowest part of the hull and moves water overboard through a discharge hose. It runs on 12V DC from the boat battery, started by hand or by a float control when water rises.
How many GPH does a bilge pump need?
It depends on the boat: the listings here state 2000 GPH, 1500 GPH and 750 GPH, with the 750 GPH pump made for kayaks, canoes and small boats. Match flow to the size of the bilge and the height the water must climb, using the max head the listing states.
What is max head on a bilge pump?
Max head is the highest the pump can push water, stated as a height. The SEAFLO pump states a 16.4 ft max head, the 2000 GPH 6699 pump (on Amazon) states a 19.7 ft max delivery height, and the 750 GPH 6699 pump states a 9 ft max delivery height.
Do bilge pumps need a float control?
No, but a float control lets the pump run by itself when water rises. The SEAFLO pump works with manual panel controls and automatic float controls, while the 6699 pumps state no control type and the Rule listing states none at all.
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