Water Maker Comparison

At A Glance – Petrol (Gasoline) vs 12VDC

Rainman offers three main power sources for our watermakers. AC electric, petrol (gasoline), and 12VDC electric. This table compares the specifications between the petrol (gasoline) and 12VDC Rainman systems. Keep in mind there are different options for reverse osmosis (RO) units, so the fresh product water output depends on which one you choose.

Change Comparison View

Petrol 12VDC
Product Water Output Expectations
RO – High Output
(2 x Filmtec SW30-2540)
100 – 140 lph
26 – 37 gph
Not Available
RO – Compact
(2 x Filmtec SW30-2521)
50 – 70 lph
13 – 18 gph
Not Available
RO – Economy
(1 x Filmtec SW30-2540)
50 – 70 lph
13 – 18 gph
26 – 34 lph
7 – 9 gph
System Specifications
Configuration Options Case only Case or Naked
Autoflush Not Available Optional
Power Source Petrol (Gasoline) 12V DC
Power Use 700ml Fuel / 70 Minutes 410 Watts
Current Draw nil 32 Amps
Motor Type Honda GXH50 (4 stroke) Permanent magnet TEFC DC
Plug Type n/a Anderson style
Power Cord Length n/a 1.4 metres (4.5 ft)
including battery connectors
Subjective Sound Level Slightly quieter than
Honda 2kVA generator
(under max load)
Soft hum
Measured Sound Level  6 Metres in Open Lot 73dB 58dB
Integrated Lift Pump Flexible impeller Flexible impeller
High Pressure Pump General Pump WM Series General Pump WMR Series
Operating Pressure 55 bar (800 psi) 55 bar (800 psi)
Pressure Relief Valve Interpump 316SS/Ceramic Interpump 316SS/Ceramic
Prefilter Single 5 micron pleated Single 5 micron pleated
Permeate Flow Meter 0 – 150 lph (40 gph) variable aperture 0 – 40 lph (11 gph) variable aperture
Intake Hose Length 3 metres (10 ft) 5 metres (16 ft)
Vertical Water Lift 2 metres (6 ft) 2 metres (6 ft)

View system details