JABSCO
PAR-MAX 4 HD 12V Fresh Water Pump | 15.2LPM 40PSI
PAR-MAX 4 HD 12V Fresh Water Pump | 15.2LPM 40PSI
SKU:J20-210
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💧 JABSCO PAR-MAX 4 HD 12V FRESH WATER PUMP – 15.2LPM / 40 PSI
Heavy-Duty 4-Chamber Automatic Pressure Pump for Caravans, RVs & Marine Systems – Supports Up to 4 Outlets
💦 The Jabsco PAR-MAX 4 HD 12V Fresh Water Pump is a heavy-duty automatic pressure pump designed for larger caravan, RV and marine water systems that need strong flow, smooth operation and dependable multi-outlet performance.
Delivering up to 15.2 litres per minute with a 40 PSI pressure-switch cut-off, the PAR-MAX 4 HD provides significantly more capacity than smaller single- or dual-outlet pumps while maintaining a practical operating pressure for compatible fresh water systems.
Its modern quad four-chamber diaphragm pump head provides smooth water delivery even at lower demand, while the built-in pulsation-dampening bypass valve helps control unwanted cycling, reduce pulsation and minimise pump noise.
The heavy-duty construction includes a wider-diameter motor with powder-coated shell, cast aluminium end bells and lower housing, providing a robust design for demanding fresh water installations.
Designed to supply up to four 12mm outlets, the PAR-MAX 4 HD is ideal for larger caravans, motorhomes and pleasure craft requiring automatic pressure for showers, galley taps, bathroom faucets and additional water outlets.
⚡ KEY FEATURES
💦 High-Flow 15.2LPM Performance
Provides strong fresh water delivery for showers, taps and larger multi-fixture systems.
📈 40 PSI Pressure Switch
Automatic pressure-switch operation with a 40 PSI cut-off for dependable on-demand water delivery.
🚿 Supports Up to 4 Outlets
Designed to serve up to four 12mm / 1/2" outlets including galley taps, showers and additional faucets.
🔄 Heavy-Duty Quad 4-Chamber Pump Head
Modern four-chamber diaphragm construction provides smooth flow, quiet operation and strong multi-fixture performance.
⚙️ Fully Automatic Operation
The built-in pressure switch automatically starts and stops the pump as water is required.
🔄 Built-In Pulsation-Dampening Bypass
Helps reduce rapid cycling and smooth water delivery when only a small amount of water is being used.
💧 Self-Priming to 2.4 Metres
Can draw water from a tank positioned below the pump within its stated 2.4m / 8ft self-priming capability.
🛡️ Short-Term Dry-Run Capability
Can run dry for short periods without damage if the fresh water tank empties or supply is temporarily interrupted.
🔥 Ignition-Protected Heavy-Duty Motor
Designed for compatible marine and mobile installations requiring ignition-protected electrical equipment.
🌡️ Thermal Protection
Includes thermal cut-out protection to help safeguard the motor from excessive operating temperature.
🔇 Vibration-Dampening Base & Feet
Helps reduce vibration transfer into floors, cabinetry and boat structures for quieter operation.
🧺 40-Mesh Inlet Strainer Included
Helps prevent larger debris from entering the pump and affecting the diaphragm or valves.
🔧 2 × 12mm Barbed Fittings Included
Supplied with two 12mm / 1/2" barbed quick-connect hose fittings.
↕️ Vertical or Horizontal Installation
Can be mounted vertically or horizontally to suit different installation layouts.
🚿 DESIGNED FOR LARGER MULTI-OUTLET WATER SYSTEMS
The PAR-MAX 4 HD is ideal where a smaller fresh water pump starts to struggle once several fixtures are connected.
It is designed to serve up to four 12mm outlets, making it suitable for systems incorporating:
- 🚰 Kitchen / galley tap
- 🚿 Internal shower
- 🚰 Bathroom basin
- 🚿 External shower or additional faucet
The extra 15.2LPM capacity provides useful flow headroom when more than one fixture is operating at the same time.
💦 15.2LPM HIGH-FLOW PERFORMANCE
Maximum Flow: 15.2 Litres Per Minute
This makes the PAR-MAX 4 HD a significant step up from smaller 3.8LPM and 11LPM-class pumps where higher total system flow is required.
📈 40 PSI PRESSURE SWITCH
This model uses a 40 PSI pressure-switch cut-off.
The pump automatically starts when water demand causes system pressure to fall and switches off once pressure rises back to the 40 PSI cut-off point.
This provides household-style automatic fresh water delivery throughout the caravan, RV or boat.
⚠️ Before installation, confirm that all hoses, taps, mixers, filters, water heaters and other plumbing components are suitable for operation with a 40 PSI pressure pump.
🔄 SMOOTH 4-CHAMBER QUAD DESIGN
The PAR-MAX 4 HD uses a modern four-chamber diaphragm pump head designed to combine higher flow with smooth water delivery.
The quad design helps provide:
- 💦 High-volume water delivery
- 💧 Smooth flow
- 🔇 Quiet operation
- ⚙️ Stable pressure performance
- 🚿 Improved multi-fixture operation
This makes it particularly useful in caravans and boats where pump pulsation and vibration can otherwise be transmitted through plumbing and cabinetry.
🛠️ HEAVY-DUTY MOTOR CONSTRUCTION
The HD series incorporates a stronger motor and housing arrangement designed for demanding fresh water applications.
Construction includes:
- ⚙️ Wider-diameter heavy-duty motor
- 🛡️ Powder-coated motor shell
- 🔩 Cast aluminium end bells
- 🔩 Cast aluminium lower housing
- 🔥 Ignition protection
- 🌡️ Thermal cut-out protection
This provides a more robust platform for regular use in larger caravan, RV and marine systems.
⚙️ FULLY AUTOMATIC ON-DEMAND OPERATION
The built-in pressure switch means there is no need to manually operate the pump every time water is required.
Open a tap and the pump automatically starts as pressure drops.
Close the tap and the pump builds pressure until the 40 PSI cut-off is reached, then automatically switches off.
🔄 BUILT-IN BYPASS REDUCES CYCLING
The internal pulsation-dampening bypass valve allows the pump to handle smaller water demands more smoothly.
This helps reduce:
- 🔄 Rapid on/off cycling
- 💧 Water pulsation
- 🔇 Repetitive pump noise
- ⚙️ Pressure fluctuations
The bypass is especially useful when a tap is partially open or a low-flow fixture is being used.
💨 DO I NEED AN ACCUMULATOR TANK?
The built-in bypass is designed to reduce pulsation and cycling, which can reduce the need for a separate accumulator tank in many installations.
An accumulator may still be useful in specialised plumbing arrangements, but it is not described as necessary for normal PAR-MAX 4 HD operation.
💧 SELF-PRIMING TO 2.4 METRES
The pump is capable of self-priming to approximately 2.4 metres / 8 feet of vertical lift.
This provides flexibility when locating the pump above or away from the fresh water tank.
🛡️ SHORT-TERM DRY-RUN PROTECTION
The PAR-MAX 4 HD can run dry for short periods without damage.
This provides useful protection if:
- 💧 The fresh water tank runs empty
- 🔧 Water supply is temporarily interrupted
- 🚐 The system needs to re-prime after being refilled
⚠️ Dry-run capability should be treated as a safeguard. Avoid unnecessary extended operation without water.
🔇 DESIGNED FOR QUIET OPERATION
Despite its higher flow capability, the PAR-MAX 4 HD is designed to provide quiet, efficient operation.
Noise reduction is assisted by:
- 🔄 Four-chamber diaphragm construction
- ⚙️ Built-in bypass control
- 🔇 Vibration-dampening base plate
- 🔇 Soft mounting feet
- 💧 Reduced low-flow cycling
For the quietest installation, avoid mounting the pump to lightweight hollow panels and minimise rigid plumbing directly beside the pump.
🧺 40-MESH INLET STRAINER INCLUDED
A 40-mesh plug-in inlet strainer is included with the pump.
The strainer helps prevent larger debris from entering the diaphragm and valve assembly and can be removed periodically for inspection and cleaning.
🔧 12MM QUICK-CONNECT HOSE FITTINGS
Two 12mm / 1/2" barbed plug-in hose fittings are included.
The quick-connect arrangement simplifies:
- 🔧 Installation
- 🛠️ Pump servicing
- 🧺 Strainer cleaning
- 🚐 Future pump replacement
↕️ VERTICAL OR HORIZONTAL MOUNTING
The PAR-MAX 4 HD can be installed vertically or horizontally, giving installers more flexibility when working with restricted mounting space.
The pump should still be installed in accordance with the correct Jabsco mounting and plumbing requirements.
🔥 IGNITION PROTECTION & THERMAL TCO
The heavy-duty motor incorporates ignition protection and thermal overload protection / TCO.
Ignition protection is particularly useful for compatible marine installations, while the thermal cut-out helps protect the motor if operating temperature becomes excessive.
Correct cable sizing, fuse protection and installation practices are still required.
⚡ 12V DC OPERATION
This model is designed specifically for a 12V DC electrical system.
⚠️ IMPORTANT: Do not connect the 12V pump directly to a 24V supply.
📋 TECHNICAL SPECIFICATIONS
Brand: Jabsco
Series: PAR-MAX 4 HD
Product Type: Heavy-Duty Automatic Fresh Water Pressure Pump
Voltage: 12V DC
Pump Design: Quad / 4-Chamber Diaphragm
Maximum Flow: 15.2LPM
Pressure Switch Cut-Off: 40 PSI
Automatic Pressure Switch: Yes
Automatic On-Demand Operation: Yes
Suitable Outlets: Up to 4 × 12mm / 1/2"
Self-Priming: Yes
Maximum Self-Priming Lift: 2.4 Metres / 8 Feet
Built-In Bypass: Yes
Pulsation Dampening: Yes
Dry-Run Capability: Short Periods
Mounting Orientation: Vertical or Horizontal
Motor: Heavy-Duty Wider-Diameter Design
Motor Shell: Powder Coated
End Bells: Cast Aluminium
Lower Housing: Cast Aluminium
Motor: Ignition Protected
Thermal Protection: Yes – TCO
Mounting: Vibration-Dampening Base Plate & Feet
Inlet Strainer: 40-Mesh Plug-In Strainer Included
Hose Connections: Quick-Connect Plug-In
Included Fittings: 2 × 12mm / 1/2" Barbed Hose Fittings
Typical Marine Application: Pleasure Craft up to Approximately 13 Metres / 40 Feet
Applications: Caravan, RV, Marine & Multi-Fixture Fresh Water Systems
🔧 INSTALLATION CONSIDERATIONS
- Use with a suitable 12V DC electrical system
- Ensure all plumbing components are compatible with 40 PSI operation
- Install the supplied 40-mesh inlet strainer
- Keep the suction line airtight for reliable self-priming
- Use suitable fresh-water-rated 12mm hose and fittings
- Keep unnecessary inlet restrictions to a minimum
- Confirm hot-water service pressure compatibility
- Use correctly sized electrical cable and fuse protection
- Protect wiring from moisture, abrasion and heat
- Mount securely using the vibration-dampening base and feet
❓ FREQUENTLY ASKED QUESTIONS
Is this specifically the 40 PSI version?
Yes. This listing is for the Jabsco PAR-MAX 4 HD 12V model with a 40 PSI pressure-switch cut-off.
Is this a good pump for a large caravan with a shower and several taps?
Yes. The PAR-MAX 4 HD is designed to serve up to four 12mm outlets and provides substantially more flow than smaller 3.8LPM or 11LPM-class pumps.
Can it run four outlets at the same time?
Jabsco specifies the pump for up to four outlets. The available 15.2LPM is shared between whichever fixtures are open, so actual simultaneous performance depends on the individual flow requirements.
Would it run two showers at once?
Potentially, particularly with efficient shower heads. Add the expected flow requirement of both showers and allow for plumbing restrictions if strong simultaneous performance is important.
Will it provide better shower performance than an 11LPM pump?
It provides more total flow capacity, which can be especially useful when another outlet is used at the same time. Actual shower pressure and flow still depend on the shower head, plumbing and hot-water system.
Will I get the full 15.2LPM from one shower?
Not necessarily. The 15.2LPM specification is maximum pump flow. Outlet flow is reduced by pressure, hose restrictions, filters, fittings and the shower head itself.
How does this compare with the Jabsco PAR-MAX 3 HD?
The PAR-MAX 3 HD provides up to 11.3LPM and is designed for up to three outlets. The PAR-MAX 4 HD increases maximum flow to 15.2LPM and supports up to four outlets, making it better suited to larger water systems.
Why choose 40 PSI instead of a higher-pressure pump?
The 40 PSI model provides high 15.2LPM flow without unnecessarily increasing system pressure. This can make it a better match for plumbing systems and appliances designed around moderate water pressure.
Is 40 PSI suitable for caravan plumbing?
It can be, but the complete system should still be checked. Hoses, fittings, filters, taps, mixers and hot-water equipment all need to be rated for the pump's pressure.
Can I use it with a caravan hot-water service?
Potentially, provided the hot-water system is compatible with a 40 PSI water supply. Check the manufacturer's maximum inlet pressure before installation.
Does it automatically start when I open a tap?
Yes. The built-in pressure switch provides fully automatic on-demand operation.
Do I need a separate pressure switch?
No. The pressure switch is built into the pump.
Do I need an accumulator tank?
Not normally. The internal bypass helps reduce pulsation and unwanted cycling, reducing the need for a separate accumulator tank.
What does the bypass valve do?
It helps the pump handle lower water demand without rapidly switching on and off. This can provide smoother flow and quieter operation when a tap is partially open.
Can I mount the pump above the fresh water tank?
Yes, within its stated self-priming capability of approximately 2.4 metres / 8 feet vertical lift.
Can I install it vertically?
Yes. The pump is specified as suitable for vertical or horizontal installation.
Can it run dry if my tank empties?
Yes. It can run dry for short periods without damage, providing useful protection if the fresh water supply is temporarily lost.
Does it include an inlet filter?
Yes. A 40-mesh plug-in inlet strainer is included.
What size hose does it suit?
The pump includes two 12mm / 1/2" barbed quick-connect hose fittings.
Is this suitable for a 40-foot boat?
The PAR-MAX 4 HD is described as suitable for fresh water systems on pleasure craft up to approximately 13 metres / 40 feet. Actual suitability should still be based on the number of outlets and total water demand.
Will it run from a 12V lithium battery?
Yes. The pump can be used with a suitable 12V lithium battery system when correctly wired and fused.
Will it run from an AGM battery?
Yes. A suitable 12V AGM auxiliary battery can also operate the pump.
How many amps does it draw?
A current specification has not been provided here, so it should not be guessed when designing the circuit. Confirm the current draw for the exact model before selecting cable, fuse and switch ratings.
Is the PAR-MAX 4 HD noisy?
It is designed for quiet operation. The four-chamber diaphragm, internal bypass, vibration-dampening base and soft feet all help reduce pump noise and transmitted vibration.
Would this be a good upgrade from an 11LPM caravan pump?
Yes if your current pump loses performance when multiple outlets are opened or if you have added more fixtures. If your existing 11LPM pump already meets your needs, the additional capacity may not be necessary.
What should I check before buying?
Confirm that your electrical system is 12V, make sure the 15.2LPM capacity is appropriate for your water demand, check that all plumbing and hot-water equipment can handle 40 PSI, confirm that the supplied 12mm fittings suit your system and verify the required current draw, fuse size and cable sizing before installation.
💦 HIGH-FLOW 40 PSI WATER PERFORMANCE FOR LARGER 12V SYSTEMS
The Jabsco PAR-MAX 4 HD 12V combines high 15.2LPM water flow with a practical 40 PSI pressure-switch configuration and robust heavy-duty construction.
With support for up to four outlets, a smooth four-chamber diaphragm pump head, built-in pulsation control, 2.4 metre self-priming capability, short-term dry-run protection and included strainer and 12mm hose fittings, it is well equipped for larger caravan, RV and marine fresh water systems.
For customers who need more flow than an 11LPM-class pump without moving to a higher-pressure 60 PSI system, the PAR-MAX 4 HD 40 PSI is a strong and practical upgrade.
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