For a strong all-around choice, I’d start with the SEAFLO 01 Series 2000 GPH, which pairs high stated capacity with anti-airlock protection. The NEWMAIX 2000 GPH Automatic adds a built-in float switch, while the SEAFLO 06 Series 1100 GPH combines automatic operation with a snap-off strainer. The main tradeoffs are pumping capacity versus power draw and outlet size, plus the convenience of automatic control versus the simplicity of a non-automatic pump. Fit matters: a pump’s rated flow does not account for hose length, lift, wiring, or outlet restrictions. Read on for the full comparison and guidance on matching a pump to your boat and bilge.
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Key Takeaways
- High stated capacity favors the 2000 GPH options: SEAFLO 01 Series and Rule 10 lead this lineup by rated flow, but their larger outlet and installation needs may not suit every bilge.
- Automatic control is available at several capacity levels: NEWMAIX, FILTERUP, MAXZONE, SEAFLO 06 Series, Shoreline Marine, and Attwood Sahara Mk2 offer built-in automatic operation or a kit, with different rated flows and configurations.
- Non-automatic pumps can be a deliberate fit: the NEWMAIX 2000 GPH and MAXZONE 1100 GPH non-automatic models suit setups with separate switching, though they require that control arrangement to be planned.
- Compact capacity options trade flow for fit: SEAFLO 01 Series 750 GPH and SEAFLO 06 Series 750 GPH use a 3/4-inch outlet, which may work better where space or hose routing limits larger models.
- Included components vary: kits such as FILTERUP 1100 GPH and JINYUNDZ 1100 GPH may simplify sourcing, while a bare pump can give buyers more control over switches, hose, and wiring choices.
| marine boat bilge pump | Voltage | Flow rate | Model | Dimensions |
|---|---|---|---|---|
| SEAFLO 01 Series 2000 GPH Bilg | 12V DC | 2,000 GPH | SFBP1-G2000-01 | — |
| NEWMAIX 12V 2000 GPH Automatic | 12V | 2,000 GPH | — | 18.5 × 16.14 × 9.45 in |
| NEWMAIX 12V 2000 GPH Non-Autom | 12V DC | — | 5201042A | 8.66 × 5.51 × 7.46 in |
| FILTERUP 1100 GPH Automatic 12 | 12V | 1,100 GPH | — | 12.6 × 10.24 × 3.15 in |
| MAXZONE 12V Automatic Submersi | 12V | 1,100 GPH (18.33 gpm) | A02-111001 | 5.71 × 2.95 × 3.94 in |
| Rule 10 2000 GPH 12V Submersib | 12V | — | — | — |
| SEAFLO 01 Series 750 GPH 12V B | 12V DC | 750 GPH | SFBP1-G750-01 | 3.57 x 2.77 x 4.25 in |
| SEAFLO 06 Series Automatic Sub | 12V | 1,100 GPH | SFBP1-G1100-06 | — |
| MAXZONE 12V 1100 GPH Non-Autom | 12 VDC | 1,100 GPH (5,000 L/hour) | A-1100GPH | 4.25 x 2.36 x 2.36 in |
| 12V Automatic Boat Bilge Pump | — | 1,100 GPH | — | 5.9 x 3.2 x 4.1 in |
| Shoreline Marine 800 GPH Autom | 12 V | 800 GPH | SL52259 | — |
| Attwood Sahara Mk2 Automatic B | 12 V DC | 500 GPH (8.33 GPM) | 5505-7 | 8.2 × 3.5 × 4.1 inches |
| Ojtrtdr 12V 1100 GPH Submersib | 12 V | Up to 1,100 GPH | CDB12 | — |
| JINYUNDZ 12V 1100 GPH Bilge Pu | 12 V DC | 1,100 GPH stated in title and description; specification unit conflicts | — | 3.5 × 3.5 × 4.3 inches |
| SEAFLO 06 Series Automatic Sub | 12 V DC | 750 GPH | SFBP1-G750-06 | — |
More Details on Our Top Picks
SEAFLO 01 Series 2000 GPH Bilge Pump
The SEAFLO 01 Series pairs a 2,000 GPH rating with anti-airlock protection, a useful combination for boat owners prioritizing fast water removal and steady operation. Its 1-1/8-inch outlet matches the hose size listed for the MAXZONE 1100 GPH, while the SEAFLO is rated for nearly twice the flow. That capacity comes with a meaningful electrical demand: it draws 8.5A and can reach 14A, so the boat’s wiring and power source need to support it. The stainless steel shaft and corrosion-resistant construction suit marine use, and the four-year limited warranty is specified in the product data. Compared with the automatic NEWMAIX 2000 GPH, this model’s listed strengths center on flow and anti-airlock protection; it does not list a built-in float switch.
Pros:- Rated at 2,000 GPH for high-capacity water removal
- Anti-airlock protection helps prevent interruptions in pumping
- Corrosion-resistant construction with a stainless steel shaft
- Four-year limited warranty is specified
Cons:- Maximum current draw of 14A calls for a suitably rated circuit
- No built-in automatic float switch is listed
- The 1-1/8-inch outlet requires a compatible hose setup
Best for: Boat owners who need high-capacity 12V drainage and can provide suitable wiring and current capacity.
Not ideal for: Owners seeking hands-off automatic activation or working with a limited-capacity electrical circuit.
- Model:SFBP1-G2000-01
- Voltage:12V DC
- Flow rate:2,000 GPH
- Outlet diameter:1-1/8 in (29 mm)
- Current:8.5A
- Maximum draw:14.0A
- Maximum head:16.4 ft (5 m)
- Wire lead:14 AWG, 3 ft (1 m)
- Warranty:4-year limited
Our verdict“Choose this SEAFLO when high flow and anti-airlock protection matter more than built-in automatic operation.”
NEWMAIX 12V 2000 GPH Automatic Marine Bilge Pump with Built-In Float Switch
The NEWMAIX 2000 GPH Automatic combines high stated capacity with a built-in float switch, so it can start pumping as water rises without relying on manual activation. That makes it a different proposition from the SEAFLO 01 Series 2000 GPH, whose provided specs emphasize anti-airlock protection and do not list an automatic switch. Both are rated at 2,000 GPH, but the NEWMAIX data does not give a current draw or maximum head, leaving buyers with less electrical and installation detail to plan around. Its thermoplastic body, stainless steel shaft, marine-grade wiring, and claimed ability to run dry describe a practical marine setup. The listed dimensions are relatively large for a bilge pump, so check the available mounting space before choosing it.
Pros:- Built-in float switch supports automatic activation
- Stated flow capacity of 2,000 GPH
- Stainless steel shaft and marine-grade wiring
- Designed to run dry without burning out the motor
Cons:- Listed dimensions may make installation difficult in a confined bilge
- Current draw and maximum head are not provided
- Noise and vibration performance are not verified in the supplied product data
Best for: Owners who want a 12V pump to activate automatically and need a stated 2,000 GPH capacity.
Not ideal for: Boaters with tight bilge spaces or buyers who need published current and maximum-head figures before installation.
- Model number:5201138
- Voltage:12V
- Flow rate:2,000 GPH
- Switch:Built-in float switch
- Material:Plastic, stainless steel
- Power source:Corded electric
- Dimensions:18.5 × 16.14 × 9.45 in
- Included components:Submersible water pump
Our verdict“Pick this NEWMAIX for automatic high-flow pumping if its larger listed dimensions fit your bilge.”
NEWMAIX 12V 2000 GPH Non-Automatic Marine Bilge Pump
For buyers who want 2,000 GPH capacity without an automatic switch, this non-automatic NEWMAIX gives manual control over when the pump runs. It draws 8A according to the supplied specs, below the SEAFLO 01 Series’ listed 8.5A current, though the SEAFLO also provides a 14A maximum draw, maximum head, wire lead, and warranty details that are absent here. The NEWMAIX’s water-cooled motor and ignition protection are relevant to marine installation, while its stated uses also extend to ponds, pools, aquariums, and water treatment. That broad use case does not remove the main boat-owner tradeoff: someone must provide the switching and activate it when needed. Its compact listed dimensions and 1.19 kg weight may suit installations where space and handling matter.
Pros:- Rated for up to 2,000 GPH
- Listed current draw is 8A
- Ignition protection and a water-cooled motor are specified
- Compact listed size and 1.19 kg weight
Cons:- Non-automatic operation requires a separate switching arrangement and attention
- Maximum head and outlet diameter are not provided
- Warranty details are not supplied
Best for: Boat owners who prefer manual switching, want a 2,000 GPH rating, and can monitor bilge conditions.
Not ideal for: Owners who need automatic unattended pumping or want detailed head, wiring, and warranty specifications.
- Model:5201042A
- Voltage:12V DC
- Pump capacity:2,000 GPH
- Current:8A
- Operation:Non-automatic
- Motor:Water-cooled
- Dimensions:8.66 × 5.51 × 7.46 in
- Weight:1.19 kg
Our verdict“Choose this NEWMAIX if you want high stated flow with manual control and can supply the switching setup.”
FILTERUP 1100 GPH Automatic 12V Boat Bilge Pump Kit
The FILTERUP 1100 GPH kit is the practical pick for buyers who want the pump and basic discharge hardware together: the package lists a six-foot hose, two clamps, and a thru-hull fitting. Its built-in reed sensor provides automatic operation, while IP68 waterproof protection and corrosion-resistant materials suit its stated marine use. Against the similarly rated MAXZONE 1100 GPH, FILTERUP stands out for its included installation parts; the MAXZONE listing instead gives a more compact pump size and specifies current draw and maximum lifting height. The FILTERUP listing does not provide either of those performance details, so electrical and lift planning may require more information. At 1100 GPH, it also sits below the 2,000 GPH SEAFLO and NEWMAIX options for buyers who prioritize maximum stated capacity.
Pros:- Built-in reed sensor enables automatic operation
- Includes a six-foot hose, two clamps, and a thru-hull fitting
- IP68 waterproof protection is specified
- Corrosion-resistant materials are listed
Cons:- 1100 GPH capacity is lower than the listed 2,000 GPH options
- Current draw and maximum head are not provided
- Installation and a 12V power source are required
Best for: Boat owners installing an automatic 12V pump who want a hose, clamps, and thru-hull fitting in the package.
Not ideal for: Owners who need a 2,000 GPH rating or detailed current and lift specifications before choosing a pump.
- Manufacturer part number:BBWP-12V
- Voltage:12V
- Flow rate:1,100 GPH
- Hose length:6 ft
- Hose diameter:1-1/8 in
- Protection:IP68 waterproof
- Dimensions:12.6 × 10.24 × 3.15 in
- Included components:Automatic bilge pump, hose, 2 clamps, thru-hull fitting, instructions
Our verdict“Choose FILTERUP if the included hose and fittings simplify your 1100 GPH automatic pump installation.”
MAXZONE 12V Automatic Submersible Bilge Pump, 1100 GPH
The MAXZONE 1100 GPH is the space-conscious automatic option in this group: its listed dimensions are 5.71 × 2.95 × 3.94 inches, and its built-in float switch uses an electronic reed sensor. Its 3.8A current draw is also specified, giving buyers a concrete figure to compare with the higher-flow SEAFLO 01 Series 2000 GPH, which lists 8.5A current and up to 14A draw. The tradeoff is capacity: 1,100 GPH is well below the SEAFLO’s 2,000 GPH rating. MAXZONE specifies a 1-1/8-inch outlet, one-meter wire lead, and 3-meter maximum lifting height, useful planning details for a compact install. The supplied listing also calls for a 12V, 8A power adapter, so confirm the intended electrical setup and do not assume the listed running draw is the only requirement.
Pros:- Compact listed dimensions suit space-limited installations
- Built-in float switch with electronic reed sensor
- Specifies 3.8A current draw and 3-meter lifting height
- 1-1/8-inch outlet and one-meter wire lead are listed
Cons:- 1,100 GPH rating is below the 2,000 GPH SEAFLO and NEWMAIX pumps
- Product data calls for a 12V, 8A power adapter
- Warranty details are not provided
Best for: Owners of smaller boats or tight bilges who want automatic operation and published size, current, and lift figures.
Not ideal for: Boaters who need the higher stated capacity of a 2,000 GPH pump or require warranty details upfront.
- Model:A02-111001
- Voltage:12V
- Flow rate:1,100 GPH (18.33 gpm)
- Current:3.8A
- Maximum lifting height:3 m
- Outlet diameter:29 mm (1-1/8 in)
- Wire lead length:1 m
- Dimensions:5.71 × 2.95 × 3.94 in
- Float switch:Built-in automatic switch with electronic reed sensor
Our verdict“Choose MAXZONE for a compact automatic bilge pump when 1,100 GPH meets your drainage needs.”
Rule 10 2000 GPH 12V Submersible Bilge Pump
The Rule 10 pairs a 2,000 GPH rating with a snap-lock strainer, making it a strong fit for a boat that needs substantial pumping capacity and regular access for cleaning. Its anti-airlock protection helps the pump keep moving water when trapped air could interrupt flow. Compared with the SEAFLO 06 Series 1100 GPH Automatic, this model is rated for substantially more water removal, but it does not switch on by itself: it needs a separate control or manual operation. The 1-1/8-inch discharge also calls for a compatible hose setup. I’d choose it for a larger bilge where an operator or separate float switch will manage activation; skippers seeking a self-contained automatic pump should look elsewhere.
Pros:- Rated capacity of 2,000 GPH suits higher-volume water removal needs
- Snap-lock strainer can be removed for easier cleaning
- Anti-airlock protection supports continued pumping
- Ignition-protected motor and corrosion-resistant marine construction
Cons:- Non-automatic operation requires a separate control plan or manual activation
- Requires a 12V power source and compatible 1-1/8-inch discharge hose
Best for: Boat owners with a larger bilge, a compatible 1-1/8-inch hose, and a separate plan for controlling pump activation
Not ideal for: Owners who need automatic water-level response without adding a float switch or other control
- Type:Non-automatic submersible bilge pump
- Voltage:12V
- Discharge:1-1/8 inches
- Lead length:6 feet
- Motor protection:Ignition-protected
- Other features:Snap-lock strainer; anti-airlock protection
Our verdict“Choose the Rule 10 when high rated capacity and cleanable strainer access matter more than built-in automatic operation.”
SEAFLO 01 Series 750 GPH 12V Bilge Pump
For a tight bilge where a smaller pump is a better physical fit, the SEAFLO 01 Series 750 GPH offers a compact body and anti-airlock protection. Its 3/4-inch outlet pairs with smaller hose setups than the 1-1/8-inch discharge on the MAXZONE 1100 GPH, which can make it a more suitable match for a modest installation. That lower flow rating also means less capacity for a boat that takes on water quickly. The three-foot wire lead may constrain placement, so check the run to your power connection before choosing it. A four-year limited warranty is a useful ownership detail, but this is still a non-automatic electric pump; buyers who want a built-in float switch should compare it with the SEAFLO 06 Series 1100 GPH Automatic.
Pros:- Compact dimensions suit tight installation spaces
- 750 GPH rating fits more modest water-removal needs
- Anti-airlock protection is included
- Four-year limited warranty
Cons:- Lower rated flow than 1,100 GPH and 2,000 GPH options in this group
- Three-foot wire lead can limit placement
- 3/4-inch outlet may not match larger existing hose setups
Best for: Owners of smaller boats with limited bilge space and an existing 3/4-inch discharge hose setup
Not ideal for: Owners who need higher pumping capacity, longer wiring reach, or built-in automatic switching
- Model:SFBP1-G750-01
- Voltage:12V DC
- Flow rate:750 GPH
- Outlet diameter:3/4 in (19 mm)
- Maximum head:8.2 ft (2.5 m)
- Current draw:2.5A; maximum draw 5.0A
- Wire lead length:3 ft (1 m)
- Dimensions:3.57 x 2.77 x 4.25 in
- Warranty:4-year limited
Our verdict“Pick this SEAFLO for a cramped, lower-demand bilge with a compatible 3/4-inch hose and separate pump control.”
SEAFLO 06 Series Automatic Submersible Bilge Pump – 1100 GPH, 12V, 1-1/8″ Outlet, Built-In Float Switch, Snap-Off Strainer, Compact for Marine Boat Yacht, CE & RoHS Certified
The SEAFLO 06 Series 1100 GPH Automatic combines its pump and float switch in one unit, so it can respond to rising water without a separate external switch. That makes it a straightforward alternative to the manual MAXZONE 1100 GPH, which has the same stated flow rate but requires manual control. A snap-off strainer also gives access for cleaning, while the 1-1/8-inch outlet suits a larger discharge setup than the 3/4-inch outlet on the SEAFLO 01 Series 750 GPH. The tradeoff is its 6A maximum draw, which buyers should account for when sizing the electrical system. Its one-meter lead also limits reach. I’d shortlist it for owners who want automatic operation in a compact 12V unit, provided the hose and power setup match.
Pros:- Built-in float switch provides automatic water-level response
- 1,100 GPH rating exceeds the SEAFLO 01 Series 750 GPH
- Snap-off strainer supports cleaning access
- Four-year warranty and CE and RoHS certifications
Cons:- Maximum draw of 6A must be considered when sizing the power supply
- One-meter wire lead may limit installation placement
- 1-1/8-inch outlet will not directly match smaller 3/4-inch hose setups
Best for: Boat owners seeking a compact, self-contained automatic pump for a 1-1/8-inch discharge setup
Not ideal for: Owners with 3/4-inch hose systems or electrical setups that cannot support the stated maximum draw
- Model:SFBP1-G1100-06
- Flow rate:1,100 GPH
- Voltage:12V
- Current:3.0A running; 6.0A maximum
- Outlet diameter:1-1/8 in
- Wire lead length:1 m (3 ft)
- Water-level control:Built-in float switch
- Warranty:4 years
- Certifications:CE, RoHS
Our verdict“Choose this model for automatic operation and 1,100 GPH capacity in a compact installation with a compatible outlet and power supply.”
MAXZONE 12V 1100 GPH Non-Automatic Submersible Boat Bilge Pump
The MAXZONE 1100 GPH delivers a useful middle ground between the compact SEAFLO 750 GPH and the higher-capacity Rule 10 2000 GPH. Its 1-1/8-inch outlet and stated 13-foot maximum lifting height give buyers specific installation figures to compare against their hose route and bilge layout. The listed ABS and stainless steel materials suit a marine environment, and the water-cooled engine is described as a durability feature. This is still a non-automatic pump, so it does not provide the hands-free response of the SEAFLO 06 Series 1100 GPH Automatic. I’d consider it for a replacement installation where manual control is already part of the setup. The product data does not state a warranty or wire lead length, so those details may need checking before purchase.
Pros:- 1,100 GPH rating sits between the 750 GPH SEAFLO and 2,000 GPH Rule options
- 1-1/8-inch outlet suits larger discharge hose setups
- Stated 13-foot maximum lifting height helps with installation planning
- ABS and stainless steel construction with a water-cooled engine
Cons:- Non-automatic operation requires manual activation or separate control
- Product data does not specify wire lead length
- Product data does not specify a warranty
Best for: Owners replacing a manually controlled 12V pump who need a 1,100 GPH rating and 1-1/8-inch outlet
Not ideal for: Skippers who want a built-in float switch or need confirmed lead length and warranty information before installation
- Model:A-1100GPH
- Type:Non-automatic submersible bilge pump
- Flow rate:1,100 GPH (5,000 L/hour)
- Voltage:12 VDC
- Maximum lifting height:13 ft (4 m)
- Outlet diameter:1-1/8 in (29 mm)
- Materials:ABS, stainless steel
- Dimensions:4.25 x 2.36 x 2.36 in
Our verdict“Choose the MAXZONE when replacing a manually controlled pump and its 1,100 GPH rating matches your bilge needs.”
12V Automatic Boat Bilge Pump Kit, 1100 GPH
The Subtoy BBP1112A kit earns its place through the included installation pieces: a six-foot flexible hose, two clamps, and a thru-hull fitting come with the 1,100 GPH automatic pump. That bundle can simplify a new setup compared with the SEAFLO 06 Series 1100 GPH Automatic, which lists a built-in float switch and snap-off strainer but no hose or fitting in the supplied product data. Both offer automatic operation and the same stated flow rate, so the Subtoy’s main distinction is the included plumbing, not greater pumping capacity. Its ABS construction and 1-1/8-inch compatibility limit material and hose choices, and it is explicitly not intended as a direct replacement for 750 GPH systems. I’d check the existing hose diameter and kit fit before choosing it.
Pros:- Built-in float switch enables automatic operation
- Includes a six-foot hose, two clamps, and thru-hull fitting
- Rated for up to 1,100 GPH
- Submersible 12V design for marine use
Cons:- Limited to 1-1/8-inch discharge hose setups
- Not designed as a direct replacement for 750 GPH systems
- ABS construction offers fewer material details than the ABS and stainless steel specified for the MAXZONE
Best for: Boat owners assembling a new 1,100 GPH system who need a hose, clamps, and thru-hull fitting in the kit
Not ideal for: Owners replacing a 750 GPH pump or keeping an existing discharge setup that does not use 1-1/8-inch hose
- Brand and model:Subtoy BBP1112A
- Power:12V
- Flow rate:1,100 GPH
- Discharge hose compatibility:1-1/8-inch setups
- Hose length:6 ft
- Water-level control:Built-in automatic float switch
- Material:ABS
- Dimensions:5.9 x 3.2 x 4.1 in
- Included components:Pump, flexible hose, 2 hose clamps, thru-hull fitting
Our verdict“Pick this kit when you want an automatic 1,100 GPH pump and its included plumbing matches your installation.”
Shoreline Marine 800 GPH Automatic Bilge Pump
The Shoreline Marine 800 GPH pairs automatic operation with more listed capacity than the 500 GPH Attwood Sahara Mk2, making it a fit for boaters who want hands-free water removal without stepping up to a 1,100 GPH pump. Its built-in automatic switch can manage routine water buildup without relying on someone to turn the pump on. Tinned marine-grade wiring and a stainless-steel impeller shaft are practical details for a wet installation, while the universal mounting base helps with removal for cleaning. The tradeoff is less service-oriented detail than the Attwood, which includes a cartridge release and multiple outlet fittings. Warranty information also requires contacting the manufacturer, so buyers who want clearly stated coverage may prefer the SEAFLO 06 Series.
Pros:- Built-in automatic switch supports hands-free operation
- 800 GPH listed flow exceeds the Attwood Sahara Mk2’s 500 GPH
- Tinned marine-grade wiring and stainless-steel impeller shaft
- Universal mounting base supports installation and cleaning
Cons:- Warranty details require contacting the manufacturer
- Supplied outlet fitting options are not specified
Best for: Boat owners seeking an automatic pump with 800 GPH listed capacity and a removable mounting base for routine cleaning.
Not ideal for: Owners who need a documented warranty or flexible outlet fittings supplied in the box.
- Model:SL52259
- Flow rate:800 GPH
- Voltage:12 V
- Hose outlet:3/4 inch
- Housing:Plastic
- Impeller shaft:Stainless steel
- Wiring:Tinned marine-grade
- Weight:12.8 ounces
Our verdict“Choose the Shoreline Marine if you want automatic operation and more listed capacity than the Attwood Sahara Mk2 in a pump with a removable mounting base.”
Attwood Sahara Mk2 Automatic Bilge Pump, 12V, 500 GPH
The Attwood Sahara Mk2 favors installation flexibility and routine service over raw pumping capacity. At 500 GPH, it has a lower listed flow than the Shoreline Marine 800 GPH and the SEAFLO 06 Series 750 GPH, so I would reserve it for smaller boats or lighter water-management demands. Its X-Air Impeller is designed to clear trapped air, and dry-run protection adds a safeguard when the pump runs after water falls away. The rotatable outlet, two outlet fittings, and one-hand cartridge release make routing and later cleaning easier than the Shoreline’s simpler mounting-base approach. The compromise is a 12 V DC requirement and plastic construction; buyers needing higher capacity should look at the larger pumps in this roundup.
Pros:- X-Air Impeller is designed to help prevent air locks
- Dry-run protection supports operation after water is depleted
- Rotatable outlet and two supplied fitting styles ease installation
- One-hand cartridge release simplifies servicing
Cons:- 500 GPH capacity is lower than the Shoreline Marine 800 GPH and SEAFLO 06 Series 750 GPH
- Requires a 12 V DC power source
- Plastic construction
Best for: Owners of smaller boats who value flexible hose routing and a cartridge that is quick to release for service.
Not ideal for: Boaters who need higher listed capacity than 500 GPH or a pump for a higher-volume bilge.
- Model:5505-7
- Voltage:12 V DC
- Flow rate:500 GPH (8.33 GPM)
- Maximum lifting height:7.5 feet
- Outlet fittings:Elbow and straight; 3/4-inch and 1-inch barbs
- Dimensions:8.2 × 3.5 × 4.1 inches
- Weight:13.76 ounces
- Warranty:1 year
Our verdict“Pick the Attwood Sahara Mk2 for a smaller bilge where easy servicing and adaptable outlet routing matter more than higher flow.”
Ojtrtdr 12V 1100 GPH Submersible Boat Bilge Pump
The Ojtrtdr 1100 GPH gives buyers a higher listed flow than the automatic Shoreline Marine 800 GPH, but it leaves switching to the operator: this is a non-automatic pump. That makes it a better match for a bilge with a separate float switch or someone who can monitor and control pumping, rather than a boat that needs unattended activation. Its 1-1/8-inch outlet is larger than the 3/4-inch outlets listed for the Shoreline and SEAFLO 06 Series 750 GPH, which may suit a higher-flow hose setup, though the plumbing must match. The removable filter base helps with cleaning, and the water-cooled motor is designed for continuous operation. The listing does not specify included hose or mounting hardware, so installation may call for additional parts.
Pros:- Listed flow rate of up to 1,100 GPH
- 1-1/8-inch outlet supports a larger hose connection than 3/4-inch models
- Removable filter base eases cleaning
- Water-cooled motor is designed for continuous operation
Cons:- Non-automatic operation requires a separate control approach or manual switching
- Included components list only the pump, so hose and fittings are not specified
- Requires installation and electrical connection
Best for: Boat owners who want 1,100 GPH listed capacity and already have a separate switch or can supervise pump operation.
Not ideal for: Boaters who need automatic bilge monitoring or a pump kit with hose and thru-hull fittings included.
- Model:CDB12
- Voltage:12 V
- Flow rate:Up to 1,100 GPH
- Operation:Non-automatic
- Outlet size:1-1/8 inches
- Housing:ABS
- Shaft:Stainless steel
- Weight:12.32 ounces
Our verdict“Choose the Ojtrtdr if you need 1,100 GPH listed capacity and can provide the switching and plumbing setup that its pump-only listing leaves to you.”
JINYUNDZ 12V 1100 GPH Bilge Pump Kit
The JINYUNDZ 1100 GPH kit is the practical choice for buyers who need basic discharge parts along with a non-automatic pump. Its package lists a 6.5-foot hose, two stainless-steel clamps, and a thru-hull fitting, pieces the Ojtrtdr 1100 GPH listing does not specify. That can simplify outfitting a new or replacement installation, though it does not add automatic switching: the pump still needs manual control or a separate switch. Its 1,100 GPH figure is stated in the title and description, while the specification data also contains a conflicting GPM unit; I would verify the rated flow before relying on it for a specific duty. The removable snap-lock filter base supports cleaning, but the 1.1-pound listed weight is heavier than the Ojtrtdr’s 12.32 ounces.
Pros:- Kit lists a 6.5-foot hose, two clamps, and a thru-hull fitting
- Removable snap-lock filter base simplifies cleaning
- Sealed, corrosion-resistant housing is described for marine use
- 1,100 GPH capacity is stated in the title and description
Cons:- Non-automatic operation requires manual control or a separate switch
- Specification data conflicts on the flow-rate unit
- At 1.1 pounds, it weighs more than the Ojtrtdr 1100 GPH pump
Best for: DIY boat owners replacing a pump who want hose, clamps, and a thru-hull fitting in the listed package.
Not ideal for: Owners who need automatic activation or require an unambiguous flow-rate specification before choosing a pump.
- Pump type:Non-automatic submersible
- Flow rate:1,100 GPH stated in title and description; specification unit conflicts
- Voltage:12 V DC
- Hose length:6.5 feet
- Included components:Pump, hose, thru-hull fitting, two stainless-steel clamps
- Materials:ABS and stainless steel
- Dimensions:3.5 × 3.5 × 4.3 inches
- Weight:1.1 pounds
Our verdict“Choose the JINYUNDZ kit when included discharge hardware is useful and you can manage switching and verify the flow specification.”
SEAFLO 06 Series Automatic Submersible Bilge Pump – 750 GPH, 12V, 3/4″ Outlet, All-in-One with Float Switch and Snap-Off Strainer
The SEAFLO 06 Series 750 GPH combines the pump and float switch in one unit, offering automatic operation in a compact setup. Its listed capacity sits between the Attwood Sahara Mk2’s 500 GPH and the Shoreline Marine’s 800 GPH, so it is a middle ground for buyers who want hands-free control without choosing the roundup’s higher-capacity 1,100 GPH pumps. The snap-off strainer is useful when debris needs clearing, and the ignition-protected housing and pre-wired leads support marine installation. There are fit limits: the 3/4-inch outlet may not suit larger hose runs, and the three-foot lead can require an extension. Compared with the Attwood, its supplied specs emphasize integrated switching and capacity rather than multiple outlet fittings.
Pros:- Integrated float switch supports automatic operation in one unit
- 750 GPH listed flow is higher than the Attwood Sahara Mk2’s 500 GPH
- Snap-off strainer supports easier cleaning
- Ignition-protected housing and pre-wired leads are specified
Cons:- Three-foot power lead may require an extension
- 3/4-inch outlet limits compatibility with larger hose fittings
Best for: Owners with limited bilge space who want an integrated automatic switch and a 750 GPH pump.
Not ideal for: Boaters whose hose setup needs a larger outlet or whose pump location requires a longer power lead.
- Model:SFBP1-G750-06
- Voltage:12 V DC
- Flow rate:750 GPH
- Outlet size:3/4 inch (19 mm)
- Maximum draw:5.0 A
- Wire lead length:3 feet (1 m)
- Impeller:5-blade high efficiency
- Warranty:4 years
Our verdict“Choose the SEAFLO 06 Series if you want an integrated automatic pump with more listed flow than the Attwood and your installation fits a 3/4-inch outlet.”
How We Picked
I compared these marine boat bilge pumps by their stated flow capacity, automatic control arrangement, outlet size, and the installation details implied by each product’s configuration. Those factors affect whether a pump suits a small compartment, a higher-volume bilge, or a boat where unattended switching matters. I also weighed features such as anti-airlock protection, snap-off strainers, and included kit components because they can affect setup and routine access.
The ranking favors a useful balance of capacity, practical features, and clear buyer fit. The SEAFLO 01 Series 2000 GPH takes the overall lead for its high stated flow and anti-airlock feature; automatic models rank well when their built-in controls add useful convenience. Smaller pumps and non-automatic models remain sensible for specific installations, but their lower capacity or need for separate control makes them less universal. Product names alone do not provide measured flow under a boat’s actual head height, so I treat GPH figures as stated ratings rather than guaranteed onboard performance.
Factors to Consider When Choosing Marine Boat Bilge Pumps
Before choosing a pump, I’d match the pump to the boat’s bilge, electrical setup, and likely water ingress. A higher GPH label can be appealing, but installation details determine how much water moves through the finished system.
Match rated capacity to the boat and installation
Start with the boat’s size, bilge layout, and the role this pump will play in the system. A pump’s rated GPH is generally measured under specified conditions, while lift, hose length, bends, and fittings can reduce delivered flow. That means a long or restrictive discharge run can undercut the advantage of choosing the largest rating. Check the manufacturer’s flow information at the lift height closest to your installation when available. A smaller pump can be a sensible fit in a confined compartment or as a secondary pump, but it should not be treated as equivalent to a higher-capacity primary pump. For safety planning, consider whether the boat needs more than one pump or an alarm as well.
Choose automatic control with the whole system in mind
A built-in float switch can start a pump as bilge water rises, which helps when nobody is aboard to operate a manual switch. Automatic control also adds a component that needs room to move and should be checked for fouling or obstruction. Verify how the pump behaves during routine switching and whether its wiring requires a dedicated fuse or an always-powered circuit. A non-automatic model may fit a system with a separate float switch or control panel, but that control must be included in the plan. Avoid assuming that “automatic” means maintenance-free; debris and wiring faults can still prevent operation. Test the complete installed system, not just the pump motor.
Confirm outlet diameter and discharge routing
Outlet size determines which hose and fittings can connect without awkward adapters. Check the pump outlet against the boat’s existing hose before ordering, since reducing diameter can restrict discharge and add another potential leak point. Route the hose upward and out through an appropriate discharge fitting, following the boat and pump maker’s directions. Keep the run as direct as the layout allows and secure connections against movement. If the outlet exits near or below the waterline, use the correct anti-siphon arrangement for the installation. A pump that fits the bilge but cannot be routed cleanly is a poor match.
Plan for power draw, wiring, and backup
Higher-capacity pumps can draw more current, so compare the pump’s electrical specifications with the boat’s wiring, fuse, switch, and battery capacity. Use the wire size and fuse guidance supplied by the manufacturer; undersized wiring can cause voltage drop and impair performance. Automatic pumps may need a circuit that remains powered while the boat is unattended, which changes how the battery system is arranged. Think through what happens if the primary battery is depleted or the pump is blocked. A second pump, high-water alarm, or regular battery checks may suit a boat that sits unattended for long periods. Do not select a pump on GPH alone without checking the electrical system it depends on.
Compare kits with individual components
A kit can reduce the number of separate parts to source, but the included hose, fittings, switch, or wiring may not suit your boat’s dimensions or installation standards. Before buying, check the package contents and compare them with what is already onboard. A pump sold alone can be a better choice when you want a specific float switch, control panel, or hose material. Look for clear access to the strainer and mounting points, since cleaning and inspection are part of ongoing ownership. Snap-off strainers can make access easier, but they still need periodic checks for debris. Build the full installed cost and service plan around the parts you will actually use.
Treat bilge pumps as part of a safety system
A bilge pump handles water that collects in the bilge; it is not a substitute for finding and correcting a leak. Think about the likely source and rate of water ingress, and whether one pump gives enough margin for the boat’s use. Keep manual access available so you can respond if an automatic switch fails or water enters faster than the pump can remove it. Include routine inspections of wiring, hoses, strainers, and discharge points in the boat’s maintenance schedule. Salt, oil, and debris can affect components, so follow the pump maker’s guidance for the water and cleaning methods involved. A well-matched pump is only one part of keeping water management dependable.
Frequently Asked Questions
Should I choose a 2000 GPH pump or a 1100 GPH pump for my boat?
Choose based on the boat’s bilge volume, installation height, discharge hose, and electrical capacity rather than the rating alone. A 2000 GPH model such as the SEAFLO 01 Series or Rule 10 has a higher stated capacity than the 1100 GPH options, but may need a larger outlet and more current. A 1100 GPH pump can be easier to fit in a smaller space, especially if the hose run is short and unrestricted. Check manufacturer flow data at your expected lift height and compare it with the boat’s needs. For a primary safety pump, consider whether a separate backup or alarm is warranted.
Is a built-in float switch better than a separate switch?
A built-in float switch can make installation more straightforward and keeps the pump and automatic control in one unit. A separate switch can offer more flexibility if you want to place the sensor where water collects or use a control panel with manual override. Either setup depends on clear movement, sound wiring, and regular checks for debris or sticking. Confirm the pump’s wiring instructions and how the automatic circuit is powered when the boat is unattended. The right choice depends on the bilge layout and the control system already aboard.
Can I use a non-automatic bilge pump as my only pump?
You can use one as part of a system that includes a separate switch, but a pump that only runs when switched on will not respond by itself while the boat is unattended. If you rely on a non-automatic model, plan how water will be detected and how the pump will be activated. A manual switch alone may not help when nobody is aboard. Check that the separate switch and wiring are rated for the pump and installed according to their instructions. For unattended boats, consider an automatic pump or a properly designed separate automatic control.
Will a larger outlet or pump rating make my existing bilge system work better?
Only if the hose, fittings, discharge route, and electrical supply can support the pump. A narrow hose, long run, sharp bends, or substantial lift can reduce delivered flow, even with a high stated GPH. A larger outlet can also require new hose and fittings, so check compatibility before replacing the pump. Compare the existing system’s dimensions with the candidate pump and use the manufacturer’s performance data for the installation height. Replacing one component without checking the rest can add work without delivering the expected flow.
When is a smaller 500–800 GPH pump the right choice?
A smaller pump can make sense where the bilge is compact, the expected water load is modest, or a tight space and smaller outlet limit installation choices. The Attwood Sahara Mk2 is rated at 500 GPH, while the Shoreline Marine model is rated at 800 GPH; these ratings place them below the 1100 and 2000 GPH choices in this roundup. Check the boat’s likely water ingress and the pump’s delivered flow at the installed lift before treating a smaller model as sufficient. A smaller unit can also serve as a secondary pump, depending on the system design. If it will be the only pump, weigh fit against the consequences of limited capacity.
Conclusion
For the broadest fit among these options, I’d choose the SEAFLO 01 Series 2000 GPH as best overall, with its high stated capacity and anti-airlock protection. For buyers seeking automatic operation at a midrange capacity, the SEAFLO 06 Series 1100 GPH stands out for its built-in float switch and snap-off strainer; the FILTERUP 1100 GPH kit is a value-oriented pick when its included components suit the installation. The Rule 10 2000 GPH is the premium alternative for buyers prioritizing high stated flow from a recognized marine pump line, while beginners may prefer a clearly specified automatic kit after checking its included parts and wiring needs. For compact spaces or smaller hose runs, compare the SEAFLO 06 Series 750 GPH and Attwood Sahara Mk2 500 GPH; for a system with separate controls, consider the non-automatic NEWMAIX or MAXZONE models. Choose only after confirming outlet fit, wiring, and expected delivered flow for your boat.
