The AC system is by far our most popular watermaker. It’s a very simple and highly reliable system that can make up to 140 litres (37 gallons) of fresh potable water per hour.
Options exist for this system to be run as portable without any plumbing or plumbed in with a minimum footprint installation.
Our AC system is a great option when you want to make a lot of water quickly and get back to enjoying yourself.
Two Components – One Watermaker
The system is made up of a pressure supply unit (PSU) and a reverse osmosis unit (RO).
Both parts are required to make a complete watermaker. The PSU lifts the seawater, filters out the sediment and puts the system under high pressure, while the RO unit extracts fresh water from the stream of pressurised seawater.
Most of the water goes out to waste as brine output, while about 20% of the volume is extracted as fresh potable water for your tanks.
Different RO options exist for you to select with your AC Rainman system, each to achieve their own specific objective.
With recent advancements in generators, batteries, and solar power generation, you have several options for powering the AC system.
Originally designed to run off of a minimum of a Honda 2kW generator, it will be easily powered by your inbuilt generator or a quality 2kVA inverter.
Choose either a 230VAC/50Hz or 115VAC/60Hz option to suit the power available in your situation.
Installed or Portable Watermaker
Our traditional system in the blue case can be used as either portable or installed. If you wish to install it, it becomes a two box installation. Various approaches that can be utilised include:
- Keep it portable, pulling it out and setting it up each time you wish to use it.
- Leave the unit in a locker, but pull out the hoses and throw overboard to make water, avoiding the need to move the system around on your deck.
- Keep the system portable, but use a cam-lock fitting to temporarily plumb the system into a teed deck wash fitting. This gives the benefits of an installed system while using your portable unit while underway.
- Fully plumb the system in, including the autoflush system.
Reverse Osmosis Options
You have three basic reverse osmosis (RO) options, depending on your water requirements, space available, and budget.
All three RO options are compatible with the AC PSU and available in either the cased and naked configurations.
2 x 40″ RO Membranes
Our most common configuration with the AC system due to having the highest output and best overall value. Twice the output of the other options.
2 x 21″ RO Membranes
A great option if you are physically space constrained. Also common if this is a backup system on a larger vessel as it can be stowed in smaller spaces.
1 x 40″ RO Membrane
Our entry level water maker system is best suited for those on a budget. It can be upgraded to a high output system at a later date by adding a second membrane.
Case or Naked
The system can be purchased either as the traditional blue case version or in the Naked configuration. The pricing, performance and power consumption are identical between the two options, so your specific requirements control which is best suited for your application. The table summarises the differences between the two options.
Features common to both Cased and Naked versions
|1.5 HP totally enclosed fan cooled (TEFC) induction motor|
|1250 watts steady state power consumption|
|Current draw 6 amps (230VAC) or 12 amps (115VAC)|
|Power cord length: 3 metres (10 ft)|
|Plug type choices: US (NEMA 5-15), Australian (AS/NZS 3112), UK (BS 1363), Europe (CEE 7/7)|
|Integrated flexible impeller lift pump uses non-proprietary impeller|
|2 metre (6 ft) maximum lift above sea level|
|General Pump WMR 316 stainless steel high pressure triplex plungerpump|
|Integrated General Pump 316SS/ceramic relief valve to prevent overpressurisation|
|Sound levels – 62dB at 6 metres (20 ft) – see chart|
Cased version specific features
Naked version specific features
|Case of sturdy injection moulded polypropylene||No shell|
|PSU storage/mounting seat: fibreglass reinforced nylon with strap||PSU easy mounting kit: fibreglass reinforced nylon for high rigidity and tensile strength|
|RO Case (mountable if desired): rotomoulded polyethylene||RO easy mounting kit: fibreglass reinforced nylon for high rigidity and tensile strength|
|Plumbing installation kit at extra cost||Plumbing installation kit included with purchase|
|Single 10″ x 2.5″ non-proprietary 5 micron prefilter to remove sediment mounted on PSU||Single 10″ x 2.5″ non-proprietary 5 micron prefilter to remove sediment with SS316 mounting bracket|
|0 – 150lph (40gph) product water flow meter, integrated into RO case||0 – 150lph (40gph) product water flow meter, with SS316 mounting bracket|
|Valve/gauge control assembly integrated into RO case||Valve/gauge control assembly at end of 5 metre (16 ft) high pressure hose for remote mounting|
|5 metre (16 ft) intake hose fitted with one way valve to remain primed, with detachable strainer||5 metre (16 ft) intake hose|
|3 metre (10 ft) brine waste discharge hose||6 metre (20 ft) brine waste discharge hose|
|PSU weight: 24kg (53lb)||PSU weight: 23kg (51lb)|
|PSU Dimensions: 600 x 375 x 270mm (23.6 x 14.8 x 10.6″)||PSU Dimensions: 470 x 270 x 240mm (18.5 x 10.7 x 9.5″)|
|Related RO weight|
– High Output: 23kg (51lb)
– Compact: 14kg (31lb)
– Economy: 11kg (24lb)
|Related RO weight|
– High Output: 22kg (49lb)
– Compact: 13kg (29lb)
– Economy: 10kg (22lb)
|Related RO dimensions|
– High Output: 1,180 x 250 x 130mm (46.5 x 9.8 x 5.1″)
– Compact: 690 x 220 x 150mm (27.2 x 8.7 x 5.9″)
– Economy: 1,180 x 250 x 130mm (46.5 x 9.8 x 5.1″)
|Related RO dimensions (in mounting brackets)|
– High Output: 1,170 x 220 x 120mm (46.0 x 8.7 x 4.7″)
– Compact: 670 x 220 x 120mm (26.4 x 8.7 x 4.7″)
– Economy: 1,170 x 220 x 120mm (46.0 x 8.7 x 4.7″)
While the base system will be sufficient for many customers, a number of options are available to get more out of your Rainman watermaker.
- Our autoflush system will allow you to leave your system unused for longer, without the need to pickle your membranes.
- The plumbing installation kit is included with the Naked Rainman systems, but can also be a very useful option if you plan to install your Cased Rainman units.
- A hydrotester will give you indication of the total dissolved solids (TDS) so you can know how your membranes are ageing.
Spares and Consumables
Your new Rainman system will arrive with enough spares and consumables to keep you going for a while, so most customers do not need to order more with initial purchase. There are a variety of items you will need over time to keep your system running for many years.