51 Series 24V Water Pump | 18.9LPM 4.8 Bar

💧 SEAFLO 51 SERIES 24V DIAPHRAGM WATER PUMP – 18.9LPM / 4.8 BAR

High-Volume 5-Chamber Automatic Pressure Pump for Marine, RV, Agricultural & High-Demand Water Systems

💦 The SEAFLO 51 Series 24V Diaphragm Pump is a heavy-duty automatic water pressure pump designed for applications requiring substantially more flow than a compact single-outlet pump.

Delivering up to 18.9 litres per minute / 5.0GPM with pressure capability up to 4.8 Bar, the 51 Series is ideal for larger marine, RV, agricultural, industrial and remote water systems where dependable high-volume delivery is required.

Its large five-chamber diaphragm design provides strong, consistent flow while the built-in pressure switch automatically starts and stops the pump as water is demanded.

Designed to supply up to four fixtures, the SEAFLO 51 Series also incorporates reduced-cycling technology that allows it to operate without an accumulator tank in many installations.

Self-priming operation, dry-run protection and compatibility with both fresh and salt water make it an exceptionally versatile solution for demanding 24V water systems.

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⚡ KEY FEATURES

💦 High-Volume 18.9LPM Flow
Delivers up to 5.0GPM / 18.9 litres per minute for larger water systems requiring significantly greater flow than a compact pressure pump.

🔄 Large 5-Chamber Diaphragm
Five-chamber construction provides consistent high-volume water delivery and smooth operation across demanding applications.

🚿 Suitable for Up to 4 Fixtures
Designed for larger water systems where multiple outlets may be connected to the same pump.

📈 Up to 4.8 Bar Pressure
Provides strong water pressure for compatible high-demand plumbing systems.

⚙️ Automatic Pressure Switch
Built-in demand pressure control automatically starts the pump when water is required and stops it when system pressure is restored.

💧 Self-Priming
Designed to draw water through the inlet line without requiring the pump to remain submerged or permanently gravity fed.

🛡️ Dry-Run Safe
Can operate without water without immediate pump damage, providing additional protection if the water supply is temporarily interrupted.

🔄 Reduced Cycling
Designed with a low starting-pressure characteristic to reduce unwanted cycling during changing water demand.

💨 No Accumulator Tank Required
Designed to operate effectively in many systems without needing a separate accumulator tank.

🌊 Fresh & Salt Water Compatible
Suitable for compatible fresh-water and salt-water pumping applications.

🌡️ Efficient Heat Dissipation
Designed for stable operation with good heat-dissipation characteristics.

📜 2 Year Warranty
Backed by a two-year warranty.

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🚿 DESIGNED FOR HIGH-DEMAND WATER SYSTEMS

The SEAFLO 51 Series is intended for installations where a smaller 3–11LPM pump does not provide enough water for the number of outlets or required flow.

Typical applications include:

• 🚤 Marine fresh water systems
• 🌊 Salt-water applications
• 🚐 Larger RV water systems
• 🏠 Remote cabins
• 🚿 Multi-outlet water systems
• 🌾 Agricultural spraying
• 🏭 Industrial applications
• 💧 Filtration systems
• 🥤 Beverage processing
• ☀️ Solar water systems

With capacity for up to four fixtures, it is particularly useful where several water outlets need to be supplied from one central 24V pressure pump.

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🔄 FIVE-CHAMBER DIAPHRAGM DESIGN

The 51 Series uses a large five-chamber diaphragm pumping arrangement.

Compared with smaller diaphragm pumps, the additional chambers allow the pump to deliver a high volume of water while maintaining stable pressure characteristics.

This makes it suitable for systems where consistent water delivery is important across changing demand.

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💦 UP TO 18.9LPM / 5.0GPM

The pump is rated for water delivery up to:

Maximum Flow: 18.9 Litres Per Minute

Maximum Flow: 5.0 Gallons Per Minute

This gives the SEAFLO 51 Series considerably more capacity than compact sink pumps and mid-sized RV pumps.

⚠️ IMPORTANT: Maximum flow is not the same as guaranteed flow at maximum pressure. Real-world water delivery will depend on operating pressure, hose size, fittings, filters, vertical lift and the number of fixtures being used.

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📈 UP TO 4.8 BAR PRESSURE

The SEAFLO 51 Series is specified for pressure capability up to 4.8 Bar.

This makes it suitable for compatible systems requiring stronger pressure than many smaller caravan and marine pumps.

⚠️ IMPORTANT: Because this is a relatively high-pressure water pump, all hoses, taps, filters, water heaters, fittings and other plumbing components must be checked for compatibility with the pump's pressure before installation.

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🚿 SUITABLE FOR UP TO FOUR FIXTURES

The 51 Series is designed to supply up to four fixtures in an appropriately designed plumbing system.

A typical installation may include a combination of:

• 🚰 Kitchen / galley tap
• 🚿 Shower
• 🚰 Bathroom basin
• 🚿 External shower or additional water outlet

When several outlets are opened simultaneously, the available pump flow will be shared between them.

For best results, total fixture demand should be considered when designing the system rather than assuming every fixture will receive the pump's full 18.9LPM simultaneously.

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⚙️ AUTOMATIC ON-DEMAND OPERATION

The built-in pressure switch allows the SEAFLO 51 Series to operate automatically.

When a tap opens, system pressure falls and the pump starts to supply water.

When the tap closes and pressure is restored, the pump automatically switches off.

This provides convenient household-style water operation without requiring manual pump control every time a fixture is used.

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🔄 REDUCED CYCLING AT LOWER FLOW

The 51 Series is designed to manage changing flow requirements while reducing unnecessary pump cycling.

This is especially useful when a tap is only partially open or the water demand is lower than the pump's maximum output.

Reduced cycling can contribute to:

• 💧 Smoother water delivery
• 🔇 Less repetitive pump noise
• ⚙️ More stable operation
• 🚰 Improved performance at varying flow demand

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💨 DESIGNED TO OPERATE WITHOUT AN ACCUMULATOR TANK

The SEAFLO 51 Series can be used in many systems without adding a separate accumulator tank.

This can simplify installation, reduce plumbing complexity and save valuable space in marine, RV and remote installations.

⚠️ An accumulator may still be useful for particular system designs, but it is not stated as a requirement for normal pump operation.

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💧 SELF-PRIMING

The pump is self-priming, allowing it to draw water through its inlet plumbing when installed correctly.

This provides significantly more mounting flexibility than a centrifugal transfer pump that must remain submerged or gravity fed.

⚠️ A maximum self-priming height has not been provided here. Do not assume a specific suction lift without confirming the specification for the exact 24V model.

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🛡️ DRY-RUN SAFE

The SEAFLO 51 Series is designed to tolerate dry running without immediate damage.

This provides useful protection if:

• 💧 The water tank runs empty
• 🔧 The pump temporarily loses prime
• 🚐 The water supply is interrupted during operation

⚠️ Dry-run capability should still be treated as a protection feature rather than a reason to operate the pump without water unnecessarily.

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🌊 FRESH & SALT WATER COMPATIBLE

The SEAFLO 51 Series is suitable for both fresh and salt-water applications.

This makes it particularly versatile for marine installations where fresh water and compatible salt-water pumping applications may both be required.

Appropriate maintenance and flushing should be carried out where required for the particular installation and water type.

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🛡️ DURABLE, HEAVY-DUTY CONSTRUCTION

The 51 Series is designed for demanding use across marine, RV, agricultural and industrial environments.

It is described as providing:

• 🛡️ Good sealing performance
• 💧 Water-resistant characteristics
• 🌫️ Dust-resistant characteristics
• 🌡️ Good heat dissipation
• ⚙️ Stable pumping performance

⚠️ No specific IP ingress-protection rating has been provided here. Do not treat the pump as waterproof or suitable for unrestricted external exposure unless an appropriate IP rating is confirmed for the exact model.

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⚡ 24V DC OPERATION

This model is designed specifically for a 24V DC electrical system.

It is particularly suited to larger boats, RVs, agricultural equipment, remote systems and other installations already operating from 24V battery power.

⚠️ IMPORTANT: This listing is for the 24V version. Do not connect this pump directly to a 12V system and do not assume compatibility with a different system voltage.

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📜 STANDARDS & WARRANTY

The SEAFLO 51 Series is listed as meeting or exceeding:

• ✅ RoHS standards
• ✅ SGS standards
• ✅ ISO standards

Warranty: 2 Years

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📋 TECHNICAL SPECIFICATIONS

Brand: SEAFLO

Series: 51 Series

Product Type: Automatic Diaphragm Water Pressure Pump

Voltage: 24V DC

Diaphragm Design: 5 Chamber

Maximum Flow Rate: 18.9LPM / 5.0GPM

Maximum Listed Pressure: 4.8 Bar

Automatic Pressure Switch: Yes

Automatic On-Demand Operation: Yes

Suitable Fixtures: Up to 4

Self-Priming: Yes

Dry-Run Safe: Yes

Reduced Cycling Technology: Yes

Accumulator Tank Required: No for Typical Applications

Fresh Water Compatible: Yes

Salt Water Compatible: Yes

Warranty: 2 Years

Standards Listed: RoHS / SGS / ISO

Applications: Marine, RV, Agricultural, Industrial, Filtration, Beverage Processing, Remote Cabins & Solar Water Systems

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🔧 INSTALLATION CONSIDERATIONS

• Confirm the electrical system is 24V DC
• Mount the pump securely in an appropriate location
• Use suitable water-rated hose and fittings
• Keep the suction side airtight and as unrestricted as practical
• Ensure all plumbing components can safely handle the pump's pressure
• Confirm compatibility with any water heater or filtration equipment
• Use appropriately sized wiring and fuse protection
• Protect electrical connections from moisture and corrosion
• Do not assume an IP rating that has not been specified
• Confirm exact port sizes and fitting requirements before installation

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❓ FREQUENTLY ASKED QUESTIONS

Is this suitable for a large caravan or RV with several water outlets?

Yes. The SEAFLO 51 Series is designed for higher-demand systems and is stated as being capable of supplying up to four fixtures. Its 18.9LPM maximum flow makes it substantially more capable than smaller single-outlet pressure pumps.

Can it run a kitchen sink, shower and bathroom basin?

Yes. Those three fixtures fall within its stated capacity of up to four outlets. Available flow is shared when more than one fixture is used at the same time.

Can I add an external shower as a fourth outlet?

Potentially, yes. The pump is designed for systems containing up to four fixtures. Whether all four can provide your desired performance simultaneously depends on their individual flow requirements and the plumbing system.

Will it give good shower pressure?

The pump provides significantly greater flow and pressure capability than small caravan water pumps, making shower operation a strong application. Actual shower performance will still depend on the shower head, hose, filters and water-heater restrictions.

Will I actually get 18.9LPM from my shower?

Not necessarily. The 18.9LPM figure represents maximum pump flow. Once the pump is operating against system pressure and plumbing resistance, actual outlet flow will be lower.

Can several people use different taps at the same time?

Multiple fixtures can operate from the same pump, but the available flow will be divided between them. A system using four fixtures does not mean each individual fixture receives 18.9LPM.

Does it automatically turn on when I open a tap?

Yes. The built-in pressure switch provides automatic on-demand operation. Opening a tap causes system pressure to fall and starts the pump; closing the tap allows pressure to recover and the pump to switch off.

Do I need an accumulator tank?

Not normally. The pump is designed to operate without an accumulator tank and incorporates features intended to reduce cycling. An accumulator could still be considered for a specialised plumbing layout if required.

What does reduced cycling mean?

It means the pump is designed to cope better with lower or changing water demand without constantly starting and stopping. This can improve water delivery and reduce repetitive pump noise.

Is this better than an 11LPM pump?

It is the stronger option when you need substantially higher flow or want to supply a larger number of fixtures. An 11LPM pump may be entirely adequate for a smaller caravan with a shower and one or two taps, while the 18.9LPM 51 Series is aimed at higher-demand systems.

Will a larger 18.9LPM pump use more water?

It can if your fixtures allow the additional flow. A higher-capacity pump does not force every outlet to use maximum flow, but unrestricted taps and showers may consume water faster than they would with a smaller pump. This is worth considering in RVs with limited tank capacity.

Is 4.8 Bar too much pressure for my caravan plumbing?

It may be for some components. Before installing the pump, check the maximum pressure rating of all hoses, fittings, filters, taps, water heaters and other appliances in the plumbing system.

Can I use it with a hot-water service?

Potentially, provided the water heater is compatible with the pump's pressure and flow characteristics. Check the hot-water system manufacturer's maximum inlet pressure before installation.

Can I use it with a water filter?

Yes, provided the filtration system is correctly sized for the required flow and pressure. Restrictive filters can reduce actual water delivery.

Can I mount the pump above the water tank?

The pump is self-priming, which allows more flexible positioning relative to the tank. However, a maximum self-priming lift has not been provided here, so confirm the exact model specification if the pump will be installed significantly above the water source.

Can it run dry if my water tank runs empty?

Yes. Dry-run safety is one of the stated features. This provides useful protection if water is temporarily unavailable, although unnecessary dry operation should still be avoided.

Can I use it with salt water?

Yes. The pump is stated as suitable for both fresh and salt-water applications.

Is it waterproof?

The pump is described as having good sealing and water- and dust-resistant characteristics, but no specific IP rating has been provided. It should therefore not automatically be treated as fully waterproof or suitable for unrestricted external exposure.

Can I run it from a 12V caravan battery?

No. This listing is specifically for the 24V version. The pump requires a suitable 24V DC electrical supply.

Can I run it from two 12V batteries?

Potentially, if the two suitable 12V batteries are correctly configured as a 24V bank and the complete electrical system is designed for that arrangement. Two batteries connected in parallel remain a 12V system and would not provide the required voltage.

What current does the pump draw?

A current rating has not been provided here, so it should not be estimated for electrical system design. Confirm the specification for the exact 24V SEAFLO 51 Series model before selecting cable, fuse or switch ratings.

Can I use this for agricultural spraying?

Yes. Agricultural spraying is one of the listed applications, provided the pressure, flow and pumped liquid are compatible with the system.

Can I use it for chemical spraying?

No general chemical compatibility information has been provided. Do not assume that the diaphragm, valves or pump housing are compatible with a particular chemical without checking the exact fluid against SEAFLO's specifications.

Can I use it for drinking water?

The pump is described for water systems including RVs, boats and beverage-processing applications, but no specific potable-water certification has been stated here. If certification is required for your installation, confirm it for the exact model before purchase.

What should I check before buying?

Confirm that your system is 24V, make sure you actually need the high 18.9LPM flow capacity, check that your plumbing and appliances can handle pressure up to 4.8 Bar, determine how many fixtures will operate simultaneously and verify the exact port size, current draw, fuse requirement and installation dimensions before completing the installation.

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💦 HIGH-VOLUME 24V WATER PRESSURE FOR SERIOUS SYSTEMS

The SEAFLO 51 Series is designed for water systems that have moved beyond the capabilities of a basic caravan or single-outlet pressure pump.

With up to 18.9LPM flow, 4.8 Bar pressure capability, a large five-chamber diaphragm, automatic pressure control, self-priming operation, reduced cycling and support for up to four fixtures, it offers serious water-delivery performance in a versatile 24V package.

For larger RVs, boats, remote cabins, agricultural systems or other high-demand installations, the SEAFLO 51 Series provides the flow and flexibility needed to run a more capable water system.