Rainman Watermaker Warranty

Rainman desalinator pressure supply unit and RO membrane units are guaranteed to be free
of manufacturer defects and to perform within the published specifications for a period of two years
from the date of shipment to the original purchaser.


In the event of a warranty claim, Rainman Technology will inspect the defective component and repair
or replace at our discretion. All shipping charges are the responsibility of the purchaser.
 The warranty is void if the system was mis-handled, abused, or not operated/maintained as directed by the User Manual. Consumable items, such as the pre-filter cartridge or engine lubricant are not covered under the terms of this warranty.

The Honda engine within the Rainman pressure supply unit has a three year Honda warranty.
The system can be brought to your local Honda dealer for engine warranty issues.

Rainman Technology's liability under this warranty is limited to repair or replacement of our systems to the original purchaser. Under no circumstances is Rainman Technology liable for consequential damages related to failure of the system to perform.

Rainman System - More information and Pricing

Complete systems range between $4070 and $5929 depending upon your configuration requirements
For a complete pricing break down, we have a quick and easy form to fill out, and we'll get in touch shortly with a few questions to make sure you are choosing the optimal system for your application and usage requirements.



    The 12VDC PSUs are only compatible with the ECO and Compact membrane options - and are capable of 9GPH 

    OPTIONAL - I would like a complete quote, with shipping to:

    Thats all the information we need!
    Feel free to add your comments below,
    and press submit to send your request,


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Kindly find our old website coverage below - same information - different layout

Selecting your Rainman Portable Desalination System

The Rainman portable desalination system is a simple, two component system consisting of:
  • a PSU (Pressure Supply Unit) and
  • a Reverse Osmosis membrane case.
​The entire system in operation looks a little like this....
The PSU component of the portable desalination system is shown on the right in the photograph above, and the reverse osmosis membrane case is shown on the left. Together, they make up the complete watermaker system.

With the Rainman system you can choose between having either:
  • A Gasoline powered PSU, which requires no external power source (As in the video at the top of the page) 
  • An Electric PSU that simply plugs into a AC outlet (As in the video below, and pictured above) OR
  • A 12 VDC PSU that is perfect for vessels without AC power, and have low output requirements

Below is a video of the complete system running with an Honda EU2oooi generator onboard.... 
No install, no complex gauges, minimal setup....
Please see the chart below for the breakdown and technical specifications of each of the Pressure Supply Units
12VDC units are coming soon (June/July) - we will add this PSU below as soon as the specs are available.

Ideal for use when you have a Honda 2kW generator or an in-built generator on board.


  • Sturdy polyethylene shell.
  • Totally enclosed fan cooled (TEFC) induction motor.
  • Draws 1300 watts in steady state operation.
  • Optimised for Honda 2kW generator or higher.
  • Pre-filter and housing externally mounted for ease of service.
  • Jabsco impeller pump to lift water and provide positive pressure to the high pressure pump.
  • General Pump WM series 316 stainless steel high pressure pump, the workhorse of the RO industry.
  • General Pump relief valve to prevent overpressurisation and allow for pressure washing.
  • Sturdy 5 metre draw hose fitted with one way valve so it remains primed, with detachable strainer.
  • High pressure stainless steel quick couple outlet for connection RO membrane unit or pressure washer gun.​.
  • Can also be coupled with RO membranes from other suppliers.
  • Can be coupled with optional pressure washer gun.
  • Dimensions: Length 722mm (28.4"), Width 300mm (11.8"), Height 370mm (14.6")
  • Weight: 28.5kg (63lb)
The original gasoline version of the pressure supply unit perfect for boats with 12V electrical systems or people using the system off grid.

  • Sturdy polyethylene shell with removable front hatch for easy access.
  • Honda GXH50 50cc, 1600W (2.1 hp) gasoline powered engine.
  • Pre-filter and housing externally mounted for ease of service.
  • Jabsco impeller pump to lift water and provide positive pressure to the high pressure pump.
  • General Pump WM series 316 stainless steel high pressure pump, the workhorse of the RO industry.
  • General Pump relief valve to prevent overpressurisation and allow for pressure washing.
  • Sturdy 3 metre draw hose fitted with one way valve so it remains primed, with detachable strainer.
  • High pressure stainless steel quick couple outlet for connection RO membrane unit or pressure washer gun.
  • Can also be coupled with RO membranes from other suppliers.
  • Can be coupled with optional pressure washer gun.
  • Dimensions: Length 595mm (23.4"), Width 310mm (12.2"), Height 450mm (17.7")
  • Weight: 26.5kg (58.3lb)

Selecting your Rainman Portable Desalination System

Choosing your Reverse Osmosis membranes

Once you have chosen your PSU, the next and final step is to choose your membranes - these units simply plug into the PSU that you selected above to complete your system.

To begin with, a few facts..... 
  • Each of these membranes can connect, via a quick disconnect, to any of the PSU's. (the 12VDC will be compatible with the Compact and ECO membranes) 
  • The power efficiency of the PSU will not be effected by the size of the membrane! 
  • These membranes are self cleaning - with the correct (very) basic care, life expectancy can reach up to 10 Years... 
  • Our most popular membrane is the High Output membrane - producing up to 37 Gallons Per Hour! 

Regarding selection, it really does depend upon you onboard preference. 
Please see below for the technical specifications of each membrane option.


Single 40" 
​Reverse Osmosis
Economy Membrane

The most economical RO option is compatible with either the gasoline or electric pressure supply units. It is ideal for those trying to manage their budget.
  • Single 40" Dow Filmtec RO membrane will produce 50 to 70 litres per hour (up to 18 gph) with the pressure supply unit, depending on water temperature.
  • All salt water plumbing is 316 stainless steel.
  • Quality fluid filled pressure gauge.
  • 316 stainless steel pressure valve for long life.
  • 3 metre (10 ft) input hose with quick fit connector for connection to pressure supply unit, won't mark your deck.
  • 3 metre (10 ft) food grade polyurethane fresh water delivery hose.
  • 10 metre (33 ft) food grade polyurethane extension hose for reaching your forward water tank.
  • 3 metre (10 ft) brine waste hose.
  • Dimensions: Length 1,200mm (47.2"), Width 100mm (3.9"), Height 100mm (3.9").
  • Weight: 11.0kg (24lb).

Two 21"
​​Reverse Osmosis
Compact Membrane Case

The most compact RO system is compatible with either the gasoline or electric pressure supply units. It is ideal for use with boats that are very space constrained.
  • Two 21" Dow Filmtec RO membranes will produce 50 to 70 litres per hour (up to 18 gph) with the pressure supply unit, depending on water temperature.
  • All salt water plumbing is 316 stainless steel.
  • Quality fluid filled pressure gauge.
  • 316 stainless steel pressure valve for long life.
  • Rugged PVC case.
  • Sturdy handle to ensure ease of carrying.
  • Coarse plastic tooth zipper is long lasting and prevents corrosion.
  • 3 metre (10 ft) input hose with quick fit connector for connection to pressure supply unit, won't mark your deck.
  • 3 metre (10 ft) food grade polyurethane fresh water delivery hose.
  • 10 metre (33 ft) food grade polyurethane extension hose for reaching your forward water tank.
  • 3 metre (10 ft) brine waste hose.
  • Dimensions: Length 690mm (27.2"), Width 150mm (5.9"), Height 220mm (8.7").
  • Weight: 14.5kg (32lb).
  • This is effectively an shortened version of the 40" High Output RO Case.

Two 40"
​​Reverse Osmosis
High Output Membrane Case

The highest output RO system is compatible with either the gasoline or electric pressure supply units.


  • Two 40" Dow Filmtec RO membranes will produce 100 to 140 litres per hour (up to 37 gph) with the pressure supply unit, depending on water temperature.
  • All salt water plumbing is 316 stainless steel.
  • Quality fluid filled pressure gauge.
  • 316 stainless steel pressure valve for long life.
  • Rugged PVC case.
  • Sturdy handle to ensure ease of carrying.
  • Coarse plastic tooth zipper is long lasting and prevents corrosion.
  • 3 metre (10 ft) input hose with quick fit connector for connection to pressure supply unit, won't mark your deck.
  • 3 metre (10 ft) food grade polyurethane fresh water delivery hose.
  • 10 metre (33 ft) food grade polyurethane extension hose for reaching your forward water tank.
  • 3 metre (10 ft) brine waste hose.
  • Dimensions: Length 1,180mm (46.5"), Width 150mm (5.9"), Height 220mm (8.7").
  • Weight: 23.5kg (52lb).
  • This is effectively an elongated version of the 21" Compact RO Case.

Selecting your Rainman Portable Desalination System

The next step is to get in touch for a chat and to answer any question you may have about you intended application. Click the link below to contact us, or you can reach me direct at Chris@seataskgroup.com

Rainman Portable Desalination Reviews

From time to time, we are privileged to feature in your blogs! We thank you and enjoy sharing the links below...
Click the page images to be taken to some blogs written by some of our customers! ...

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