PAR-MAX 3 HD 12V Fresh Water Pump | 11.3LPM 60PSI

💧 JABSCO PAR-MAX 3 HD 12V FRESH WATER PUMP – 11.3LPM / 60 PSI HEAVY DUTY

Heavy-Duty 4-Chamber Automatic Pressure Pump for Caravans, RVs & Marine Fresh Water Systems

💦 The Jabsco PAR-MAX 3 HD is the heavy-duty version of the popular PAR-MAX 3 fresh water pressure pump, combining the same useful 11.3LPM flow capacity with a stronger four-chamber pump head, heavy-duty motor construction and pressure capability up to 60 PSI.

Designed for demanding caravan, RV and marine fresh water systems, the PAR-MAX 3 HD can supply up to three 12mm outlets including a galley tap, shower and additional faucet.

Its quad four-chamber diaphragm pump head delivers smooth water flow across varying demand, while the built-in pulsation-dampening bypass valve helps control unwanted cycling, reduce noise and eliminate the need for a separate accumulator tank in a typical installation.

The HD construction includes a wider-diameter motor with powder-coated shell, cast aluminium end bells and lower housing, providing a more robust design for higher-pressure applications and demanding long-term use.

Also included are a 40-mesh plug-in inlet strainer, soft rubber vibration-dampening mounts and two 12mm barbed quick-connect hose fittings, giving you the main components required for a clean fresh water installation.

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⚡ KEY FEATURES

💦 11.3LPM / 3GPM Water Flow
Provides up to 11.3 litres per minute for showers, sinks and multi-outlet caravan or marine fresh water systems.

📈 Heavy-Duty 60 PSI Pressure Capability
The HD model increases pressure capability to a 60 PSI cut-out, making it suitable for systems requiring stronger water pressure than the standard PAR-MAX 3.

🔄 Quad 4-Chamber Pump Head
Heavy-duty four-chamber diaphragm design provides smooth, consistent water delivery across varying demand.

🚿 Supports Up to 3 Outlets
Designed to supply up to three 12mm outlets such as a galley tap, shower and additional faucet.

⚙️ Built-In Pulsation-Dampening Bypass
Helps reduce unwanted cycling, improve low-flow operation and minimise pulsation through the plumbing system.

💨 No Accumulator Tank Required
The internal bypass system is designed to provide smooth flow without requiring a separate accumulator tank in a normal installation.

💧 Self-Priming to 2.4 Metres
Can draw water from a tank located below the pump within its stated 2.4m / 8ft self-priming capability.

🛡️ Extended Dry-Run Capability
The HD pump is designed to tolerate extended periods of dry running, adding protection if the water supply is temporarily interrupted.

🔇 Quiet Operation
Soft rubber vibration mounts and bypass technology help reduce noise and vibration within caravans, RVs and boats.

🧺 40-Mesh Inlet Strainer Included
Helps protect the pump from debris entering through the water supply.

🔧 Quick-Connect 12mm Hose Fittings
Includes two 12mm barbed plug-in fittings for straightforward installation and servicing.

🛠️ Heavy-Duty Motor Construction
Features a wider-diameter motor, powder-coated shell, cast aluminium end bells and lower housing for improved durability and pressure capability.

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🛠️ WHAT MAKES THE HD VERSION DIFFERENT?

The PAR-MAX 3 HD is more than simply a higher-pressure version of the standard PAR-MAX 3.

The HD design incorporates:

• 🔄 Four-chamber quad diaphragm pump head
• ⚙️ Wider-diameter heavy-duty motor
• 🛡️ Powder-coated motor shell
• 🔩 Cast aluminium end bells
• 🔩 Cast aluminium lower housing
• 📈 Pressure capability up to 60 PSI
• 💧 Extended dry-run capability

These changes make the HD model better suited to demanding systems where higher water pressure, robust construction and extended service life are priorities.

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🚿 IDEAL FOR COMPLETE CARAVAN & MARINE WATER SYSTEMS

The PAR-MAX 3 HD is designed for fresh water systems with more than just a single sink or tap.

Typical applications include:

• 🚰 Galley or kitchen tap
• 🚿 Internal shower
• 🚰 Bathroom basin
• 🚿 External shower
• 🚐 Caravan fresh water systems
• 🏕️ Camper and RV installations
• 🚤 Pleasure craft up to approximately 9–10 metres

Jabsco specifies the pump for up to three 12mm outlets, making it particularly well suited to complete touring or marine fresh water installations.

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💦 11.3LPM / 3GPM FLOW CAPACITY

Maximum Flow: 11.3 Litres Per Minute

Maximum Flow: 3 US Gallons Per Minute

This gives the PAR-MAX 3 HD enough flow for shower and multi-outlet applications while remaining compact enough for mobile installations.

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📈 60 PSI HEAVY-DUTY PRESSURE

The PAR-MAX 3 HD has a stated pressure capability up to 60 PSI with a 60 PSI cut-out pressure.

This is significantly higher than the 40 PSI cut-out of the standard PAR-MAX 3 and makes the HD version better suited to installations where stronger system pressure is required.

⚠️ IMPORTANT: 60 PSI is relatively high pressure for some caravan and RV plumbing systems. Confirm that all hoses, taps, filters, water heaters, fittings and other components are rated for the pump's pressure before installation.

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🔄 FOUR-CHAMBER QUAD DIAPHRAGM DESIGN

The heavy-duty PAR-MAX 3 uses a four-chamber diaphragm pump head rather than the triplex three-chamber arrangement used on the standard PAR-MAX 3.

The quad design contributes to smooth water delivery while supporting the HD model's increased pressure capability.

This makes the pump particularly suitable for applications where consistent flow and strong pressure are required from a compact 12V fresh water system.

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⚙️ AUTOMATIC ON-DEMAND OPERATION

The PAR-MAX 3 HD is an automatic pressure pump designed to start and stop according to water demand.

When a tap opens, system pressure falls and the pump automatically operates.

When the tap closes, the pump continues until system pressure reaches its 60 PSI cut-out point and then switches off.

This provides convenient household-style water operation in caravans, RVs and boats.

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🔄 BUILT-IN BYPASS REDUCES PULSATION

The integrated pulsation-dampening bypass valve is designed to improve operation when water demand is lower than the pump's maximum output.

This helps reduce:

• 🔄 Rapid on/off cycling
• 💧 Noticeable water pulsation
• 🔇 Repetitive pump noise
• ⚙️ Unnecessary pressure fluctuations

The result is smoother flow when a tap is partially open or a lower-flow fixture is being used.

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💨 NO ACCUMULATOR TANK REQUIRED

The built-in bypass is designed to control pulsation and pump cycling without requiring an accumulator tank for normal operation.

This can simplify the installation and save valuable space in a caravan, RV or boat.

⚠️ An accumulator can still be considered for specialised system designs, but it is not specified as necessary for standard PAR-MAX 3 HD operation.

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💧 SELF-PRIMING TO 2.4 METRES

The PAR-MAX 3 HD can self-prime to approximately 2.4 metres / 8 feet.

This means the pump can be positioned above the fresh water tank within its stated priming capability, giving installers greater flexibility when choosing a mounting location.

⚠️ Keep the suction line airtight and as unrestricted as practical. Air leaks, excessive hose length, small fittings and restrictive filters can reduce real-world priming performance.

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🛡️ EXTENDED DRY-RUN CAPABILITY

The heavy-duty pump is designed to tolerate extended periods of dry running.

This provides useful protection if:

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

⚠️ Dry-run capability is still best treated as a protection feature. Avoid deliberately operating the pump without water when it is unnecessary.

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🔇 QUIET OPERATION

The PAR-MAX 3 HD is designed to minimise the noise and vibration often associated with pressure pumps in caravans and boats.

Noise reduction is supported by:

• 🔇 Soft rubber vibration-dampening mounts
• 🔄 Built-in bypass control
• 💧 Smoother low-demand operation
• ⚙️ Reduced unwanted pump cycling

Installation still matters. Mounting the pump on a solid structure and avoiding rigid plumbing directly against the pump can help minimise transmitted vibration further.

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🧺 40-MESH INLET STRAINER INCLUDED

A 40-mesh plug-in inlet strainer is supplied in the box with the pump.

The strainer helps prevent larger debris from entering the pump and interfering with the diaphragm or valve system.

Its plug-in design also makes it easier to remove for routine inspection and cleaning.

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🔧 12MM QUICK-CONNECT HOSE FITTINGS INCLUDED

The pump is supplied with two 12mm barbed plug-in hose fittings.

The quick-connect design can make installation, pump removal and future servicing easier, particularly where access is restricted.

Suitable fresh-water-rated 12mm hose should be used where these fittings form part of the installation.

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⚡ 12V ONLY

This PAR-MAX 3 HD model is designed specifically for 12V DC operation.

⚠️ IMPORTANT: This listing is for the 12V version only. Do not connect the pump directly to a 24V electrical system.

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📋 TECHNICAL SPECIFICATIONS

Brand: Jabsco

Series: PAR-MAX 3 HD

Product Type: Heavy-Duty Automatic Fresh Water Pressure Pump

Voltage: 12V DC Only

Pump Head: Quad / 4-Chamber Diaphragm

Maximum Flow: 11.3LPM / 3 US GPM

Maximum Pressure / Cut-Out Pressure: 60 PSI

Automatic On-Demand Operation: Yes

Suitable Outlets: Up to 3 × 12mm Outlets

Self-Priming: Yes

Maximum Self-Priming Height: 2.4 Metres / 8 Feet

Built-In Bypass: Yes

Pulsation Dampening: Yes

Accumulator Tank Required: No

Dry-Run Capability: Extended Periods

Mounting: Soft Rubber Vibration-Dampening Mounts

Motor Construction: Heavy-Duty Wider Diameter Motor

Motor Shell: Powder Coated

End Bells: Cast Aluminium

Lower Housing: Cast Aluminium

Inlet Strainer: 40-Mesh Plug-In Strainer Included

Hose Connections: Quick-Connect Plug-In

Included Fittings: 2 × 12mm Barbed Hose Fittings

Motor: Corrosion Resistant

Typical Marine Application: Pleasure Craft up to Approximately 9–10 Metres

Applications: Caravan, RV, Marine & Fresh Water Pressure Systems

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🔧 INSTALLATION CONSIDERATIONS

• Use with a suitable 12V DC electrical system only
• Mount securely using the soft vibration-dampening feet
• Install the included 40-mesh inlet strainer
• Keep the suction side airtight for reliable self-priming
• Use suitable fresh-water-rated 12mm hose
• Keep unnecessary inlet restrictions to a minimum
• Ensure all plumbing is rated for up to 60 PSI
• Confirm compatibility with any hot-water service or filtration system
• Use appropriately sized electrical cable and fuse protection
• Protect wiring against moisture, heat, abrasion and sharp edges

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❓ FREQUENTLY ASKED QUESTIONS

What is the difference between the standard PAR-MAX 3 and the PAR-MAX 3 HD?

The standard PAR-MAX 3 is an 11.3LPM triplex three-chamber pump with pressure up to 40 PSI. The HD version retains the 11.3LPM flow but upgrades to a quad four-chamber pump head, a heavier-duty motor assembly and pressure capability up to 60 PSI. The HD version is the better choice where stronger pressure and more robust construction are required.

Does the HD version give more water flow than the standard PAR-MAX 3?

No. Both are rated at up to 11.3LPM. The main advantages of the HD model are its stronger construction, four-chamber pump head, higher 60 PSI pressure capability and extended dry-run capability.

Is this a good pump for a caravan with a kitchen tap and shower?

Yes. It is designed to support up to three 12mm outlets and has enough flow for a complete caravan fresh water system including a galley and shower.

Can I run three outlets from it?

Yes. Jabsco specifies the pump for up to three 12mm outlets. Flow will be shared when multiple fixtures are open at the same time.

Will it provide better shower pressure than the standard PAR-MAX 3?

The HD version can operate at a higher system pressure, with a 60 PSI cut-out compared with 40 PSI on the standard model. Whether that translates into noticeably stronger shower performance depends on the shower head, plumbing, filters, hot-water system and other restrictions.

Will I get 11.3LPM from the shower?

Not necessarily. The 11.3LPM specification is maximum pump flow. Actual shower flow will be lower once the pump is working against plumbing pressure and restrictions.

Is 60 PSI too high for a caravan?

It can be for some plumbing systems. Before installing the HD model, check the maximum pressure rating of every hose, fitting, filter, tap, mixer and hot-water appliance in the system.

Would I need a pressure reducer?

Possibly, if any component in your system is not rated for the pump's 60 PSI pressure. Whether a regulator is required depends on the plumbing and appliance pressure ratings and should be assessed before installation.

Can I use it with a caravan hot-water system?

Potentially, but this needs to be checked carefully because of the 60 PSI pressure capability. Confirm the maximum permitted inlet pressure of the hot-water service before connecting the pump.

Does the pump turn on automatically when I open a tap?

Yes. It is an automatic pressure pump designed to start as water is demanded and stop when system pressure reaches the 60 PSI cut-out point.

What is the cut-in pressure?

A specific cut-in pressure has not been provided for this HD model, so it should not be assumed from the specifications of another PAR-MAX version.

Do I need an accumulator tank?

No. The built-in bypass is designed to reduce pulsation and cycling so that a separate accumulator tank is not required for normal operation.

What does the bypass valve do?

It allows the pump to manage lower water demand more smoothly, reducing rapid on/off cycling and pulsation when a tap is only partially open.

Can I mount the pump above the water tank?

Yes, within the stated self-priming limit. The pump can self-prime up to approximately 2.4 metres / 8 feet.

Does 2.4 metres mean the maximum hose length?

No. The 2.4 metre figure refers to self-priming lift rather than total plumbing length. Longer hose runs are possible, but excessive restriction and air leaks can reduce performance.

Can it run dry if my tank becomes empty?

Yes. The HD version is specified as being capable of running dry for extended periods, which provides useful protection if the fresh water supply is lost.

Can I deliberately leave it running dry?

Although the pump is designed to tolerate extended dry operation, there is generally no benefit in running it without water unnecessarily. Dry-run capability is best treated as additional protection.

Does it come with a filter?

Yes. A 40-mesh plug-in inlet strainer is included in the box.

Does it suit 12mm caravan water hose?

Yes. Two 12mm barbed plug-in fittings are included for compatible fresh water hose.

Is the HD model noisier because it is more powerful?

It is specifically designed for quiet operation and includes soft vibration-dampening mounts plus an internal bypass to reduce cycling. Mounting surface and plumbing design still have a major effect on real-world noise.

Can I run it from a 12V lithium battery?

Yes. The pump is designed for 12V DC operation and can be used with a suitable 12V lithium auxiliary system when correctly wired and fused.

Can I run it from an AGM battery?

Yes. A suitable 12V AGM battery system can also operate the pump.

How many amps does it draw?

A current specification has not been provided here, so it should not be estimated when designing the electrical circuit. Confirm the exact current draw before selecting cable, fuse and switch ratings.

Can I use the HD model on 24V?

No. This version is specified as 12V only and must be connected to a suitable 12V DC supply.

Is this suitable for a boat?

Yes. It is designed as a heavy-duty automatic fresh water pump for pleasure craft, with the stated application extending to boats approximately 9–10 metres in length.

Would this be a good replacement for an older Jabsco PAR-MAX pump?

Potentially. Compare the existing pump's voltage, flow, pressure, mounting space, plumbing connections and electrical requirements. The most important consideration when moving to this HD model is ensuring the existing plumbing and appliances can safely handle its 60 PSI pressure.

When should I choose the HD version instead of the normal PAR-MAX 3?

Choose the HD version where you specifically want the stronger four-chamber construction, 60 PSI pressure capability, heavier-duty motor assembly or extended dry-run capability. If your system is already well suited to 40 PSI, the standard PAR-MAX 3 may be sufficient.

What should I check before buying?

Confirm that your electrical system is 12V, check that the 11.3LPM flow is suitable for your outlets, make sure every plumbing component can tolerate the 60 PSI cut-out pressure, confirm the included 12mm fittings suit your hose and verify the pump's current draw and required fuse size before completing the electrical installation.

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💧 HEAVY-DUTY JABSCO PERFORMANCE WITH UP TO 60 PSI PRESSURE

The Jabsco PAR-MAX 3 HD takes the popular 11.3LPM PAR-MAX platform and strengthens it for more demanding fresh water systems.

With a quad four-chamber pump head, heavy-duty motor construction, 60 PSI pressure capability, self-priming to 2.4 metres, built-in pulsation control, extended dry-run capability and support for up to three outlets, it is a serious option for caravans, RVs and marine systems requiring stronger, smoother water pressure.

For installations where standard-duty pressure and construction are not enough, the PAR-MAX 3 HD delivers the same practical flow with a more robust, higher-pressure design.