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.

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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 OptionsCase onlyCase or Naked
AutoflushNot AvailableOptional
Power SourcePetrol (Gasoline)12V DC
Power Use700ml Fuel / 70 Minutes410 Watts
Current Drawnil32 Amps
Motor TypeHonda GXH50 (4 stroke)Permanent magnet TEFC DC
Plug Typen/aAnderson style
Power Cord Lengthn/a1.4 metres (4.5 ft)
including battery connectors
Subjective Sound LevelSlightly quieter than
Honda 2kVA generator
(under max load)
Soft hum
Measured Sound Level  6 Metres in Open Lot73dB58dB
Integrated Lift PumpFlexible impellerFlexible impeller
High Pressure PumpGeneral Pump WM SeriesGeneral Pump WMR Series
Operating Pressure55 bar (800 psi)55 bar (800 psi)
Pressure Relief ValveInterpump 316SS/CeramicInterpump 316SS/Ceramic
PrefilterSingle 5 micron pleatedSingle 5 micron pleated
Permeate Flow Meter0 – 150 lph (40 gph) variable aperture0 – 40 lph (11 gph) variable aperture
Intake Hose Length3 metres (10 ft)5 metres (16 ft)
Vertical Water Lift2 metres (6 ft)2 metres (6 ft)

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