Head to head · updated 5 September 2026

Schenker Zen 50 vs Rainman Portable 24VDC 55L

Zen 50 costs 2.4× less energy per litre (4.8 against 11.3 Wh/L). Portable 24VDC 55L is about $2,902 cheaper on indicative pricing.

SpecZen 50Portable 24VDC 55L
BrandSchenkerRainman
Output50 L/hr45–61 L/hr
Power draw240 W600 W
Energy per litre4.8 Wh/L11.3 Wh/L
Run time for 100 L2.0 h1.9 h
Energy for 100 L480 Wh1,132 Wh
Power source12/24V DC24V DC
ConfigurationModularPortable
Membranes2 × 2.5×21in1 × 40in
Indicative price$7,800$4,898
Efficiency rank6 of 3019 of 30

Highlighted cells mark the better figure on that row alone. Lower is better for energy, run time and price; higher is better for output.

Buy the Zen 50 if…

Your boat runs on solar and every watt-hour is spoken for, because this is the cheaper litre to make; you have no generator and no intention of fitting one.

Get a quote on the Zen 50

Buy the Portable 24VDC 55L if…

You want tanks full in the shortest possible run, or you have a genset that is going to run anyway; the purchase price matters more to you than the running cost; you want to lift the whole thing off the boat between trips.

Get a quote on the Portable 24VDC 55L

Common questions

Which is more efficient, the Zen 50 or the Portable 24VDC 55L?
The Zen 50, at 4.8 watt-hours per litre against 11.3. Over 100 litres a day that is a difference of about 652 Wh.
Which makes more water, the Zen 50 or the Portable 24VDC 55L?
The Portable 24VDC 55L, at 53 L/hr against 50. That is 1.1 times the output per hour running.
Which is cheaper?
On indicative pricing the Portable 24VDC 55L at $4,898, about $2,902 less than the other. Both figures exclude freight, duty and installation, and Australian dealer pricing normally reads higher.
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