System selection guide


As the premier Rainman Watermaker sales and service facility in North America since 2014, Seatask is your specialist provider for Rainman Desalination equipment and provides a comprehensive and responsive support service for the region.
Over the next few minutes, you will work through system selection, with the opportunity to review options, request further information and pricing, or to place your system order securely online. If you have any questions in the process, please don’t hesitate to call, email or text – we’ll be happy to help!
From the team here in Ft Lauderdale, we look forward to hearing from you!
We accept all major credit cards online. We also offer in-house Financing.
Simply select ‘credit card’ or ‘finance my system’ at the payment screen.
Questions? Give me a call – i’m happy to help!
Christopher Burton
President, Seatask
Direct Line / Texts: +1 305 965 8775

Step 1

Select Your

Pressure Supply Unit

What is a PSU?

PSU stands for Pressure Supply Unit and is ‘part one’ of the two part system that makes up the complete rainman watermaker. The PSU draws water from the source (i.e ocean), prefilters and pressurises the water prior to sending it on to the membranes – which is ‘part two’ of the system that will be selected in the next step.

How To Choose Your PSU

The primary factor used to select your PSU is your available power onboard.
115 V or 230 V PSU’s are by far the most popular selection and requires nothing more than a small portable generator or larger to operate (such as the honda EU2000 or EU20). If you have this AC power, it is recommended that you opt for the AC PSU. The AC PSU is compatible with all membranes up to 37GPH
The Gasoline PSU requires no external power at all, so is ideal for vessels that have no source of power, or owners looking for a truly portable desalination system. The system is operated from its onboard Honda 4 Stroke engine, so gasoline will be required for operation.
The 12 V DC PSU requires Batteries & Solar/Wind to provide 33Amps / 400Watts of power for operation – this is a lower output system with a maximum capability of 7-9 GPH

Can I Install The PSU?

Yes! – The AC and DC PSU’s come both in a Portable or Naked configuration. The Naked systems come complete with a comprehensive installation hardware package, where the portable systems come complete with high impact polyethylene casings.
You can also remove the casing of the portable system if you choose to install at a later date, and vice versa – the installed version can be added to a case to convert to a fully portable system

Click The PSU That Best Works For You Below To Continue....

115V (USA) Pressure Supply Unit


230V (EURO) Pressure Supply Unit


12V DC Pressure Supply Unit


115V (USA) Pressure Supply Unit


230V (Europe) Pressure Supply Unit


12V DC Pressure Supply Unit


Gasoline Pressure Supply Unit


As Featured In..

Rainman systems have been featured in countless articles, blogs, websites, youtube videos and have would numerous awards. This experience and global coverage ensure that you are investing in quality, reputable equipment – stood behind by a wide network of support personel, dealers and staff.

Get In Touch

+1 (305) 965-8775



Walk In’s / Store / Pickups suspended until further notice.

Local delivery available, nationwide and global shipping unaffected. 


Ft Lauderdale
Florida, 33334



Office / Phone Hours

Mon:10am – 4pm
Tue: 10am – 4pm
Wed: 10am – 4pm
Thur: 10am – 4pm
Fri: 10am – 3pm
Sat: 10am – 1pm
Sun: Closed

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