Schenker · Watermaker

Schenker watermakers

Schenker of Naples builds reverse-osmosis watermakers without a high-pressure pump: a low-pressure feed pump supplies the patented Energy Recovery System (ERS), which uses the brine leaving the membranes to raise the feed water to membrane pressure, so a 30 l/h unit draws only about 110 W from the house bank. The flat Zen (30, 50, 100 and 150 l/h, plus the Zen Twin with two units under one panel) has been the core range since 2018 and carries ERS, membranes and valves in one block; the older Smart (30 to 100 l/h) and Modular (60 to 150 l/h, larger sizes AC only) keep these parts separate. Units up to 60 l/h use Shurflo diaphragm feed pumps, two of them on the Zen 50, Smart 60 and Modular 60, while the 80 to 150 l/h units have a motor-driven rotary-vane pump head. The cube-shaped Qube (30, 65 and 100 l/h) joined the range in 2025; no spare-parts list for it is online yet, so the parts below do not cover it.

Manuals & documents

The links go to Schenker’s manuals as hosted by its authorised dealers MAR nautic and Maritimo; Schenker’s own site offers data sheets and brochures only. We host no manuals or drawings.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Prefilter elementF51,2,3,4,5,6—5 micron, 10 in (9 3/4 × 2.32 in), for every model except the Zen 30: Zen 50, 100 and 150, Zen Twin, Smart 30 to 100, Modular 60 to 150.
Prefilter elementF5R7,8,9,10,11—5 micron, 5 in (5 × 2.32 in), for the Zen 30 and Zen 30 Race as listed in the 2024 manuals. The 2018 Zen 30 manual lists this cartridge as F5B; no source says the old code was replaced, so give your serial number when ordering.
Charcoal filter elementCA1,2,3,4,12,11—10 in, on the fresh-water flushing line of every model except the Zen 30. It has its own shut-off valve, so you can change it without depressurising the boat’s water system. Replace it once a year.
Charcoal filter elementZ30CA7,8,13,11—5 in, for the Zen 30 as listed in the 2024 manuals. The 2018 Zen 30 manual lists the 5 in carbon cartridge as CA, the code the other models use for their 10 in one; no source says one code replaced the other.
Reverse-osmosis membraneM25217,1,3,14,15,16—2.5 × 21 in (SW2521): one in the Zen 30 and the Smart 30, two in the Zen 50, three in the Modular 60 (two in older Modular 30 units). Average life 6 to 7 years.
Reverse-osmosis membraneM254017,18,19,20—2.5 × 40 in (SW2540): one in the Smart 60, two in the Smart 80.
Reverse-osmosis membraneM40212,21,4,22,23,24—4 × 21 in (SW4021): two each in the Zen 100, Zen 150 and Modular 100. Schenker’s product page gives the same size for the Zen Twin, but no manual or dealer lists the fit.
Reverse-osmosis membraneM404025,26,27—4 × 40 in (SW4040): one in the Smart 100 and one in the Modular 150.
Pump seal kitSSZ37,8,28,11—ERS seal kit for the Zen 30 as listed in the 2024 manuals. The 2018 Zen 30 manual lists SSZ3-2.0; no source says the old code was replaced.
Pump seal kitSSZ51,29,30—ERS seal kit for the Zen 50.
Pump seal kitSSZ12,31,32,33—ERS seal kit for the Zen 100: all three 2024 Zen 100 manuals list SSZ1, but MAR nautic sells the Zen 100 kit as SSZ10. Give your serial number when ordering.
Pump seal kitSSZ1521,34,35—ERS seal kit for the Zen 150.
Pump seal kitSS36-2.03,17,18,14,36,37—ERS seal kit of the 2.0 generation (from about 2013) for the 30 to 80 l/h units: Smart 30, Smart 60, Smart 80 and Modular 60.
Pump seal kitSS100-2.025,4,38—ERS seal kit 2.0 for the Smart 100 and Modular 100.
Pump seal kitSS152-2.026—ERS seal kit 2.0 for the Modular 150.
Storage & cleaning chemicalsSC1 · SC21,17,4,39,40,41,42—Schenker cleaning products for every model. SC1: acid cleaner against scale and other inorganic deposits, and the storage (pickling) product left in the unit for lay-ups longer than 2 to 3 months. SC2: alkaline cleaner against organic fouling such as mould, bacteria or a rotten-egg smell; use it before SC1.
Maintenance packCK7,1,3,4—Cleaning kit with one SC1 and one SC2. With one 5-micron cartridge it is Schenker’s spare recommendation for short cruises.
Service kitCRK1361,2,17,4,43—Cruising kit: three F5 5-micron cartridges, one CA carbon cartridge and a cleaning kit (SC1 and SC2). For every model except the Zen 30; Schenker recommends it for long cruises.
Service kitCRKZ307,8,11—Cruising kit for the Zen 30 with its 5 in cartridges and the cleaning products, as listed in the 2024 manuals. The 2018 Zen 30 manual lists CRK136 instead; no source says one replaced the other.
Pump assemblySP36/12 · SP36/247,1,3,17,14,44,45—Spare Shurflo diaphragm feed pump, 12 V / 24 V, for the 30 to 60 l/h units: Zen 30, Zen 50, Smart 30, Smart 60, Modular 60. Zen 50, Smart 60 and Modular 60 have two pumps and can run on one at about half output (Zen 50: about 25 l/h at 110 W). MAR nautic sells SP36/24 for units built up to 2020.
Pump assemblySP36/24N46—24 V feed pump for Zen, Smart and Modular units of 30 to 60 l/h built from 2021. One dealer (MAR nautic) lists it; the manuals checked do not.
Diaphragm kitSDK47—Diaphragm kit for the Shurflo feed pumps of the Zen 30 and 50, Smart 30 and 60 and Modular 60. One dealer (MAR nautic) lists it.
Pump headSP102,21,25,4,26,32,48,49—Rotary-vane pump head for the 100 and 150 l/h units: Zen 100, Zen 150, Zen Twin, Smart 100, Modular 100, Modular 150. The Zen 100 for 230 V 60 Hz takes SP10-60.
Pump headSP8018—Pump head for the Smart 80.
Pump headSP6050—Pump head for the 230 V versions of the Smart 60 and Modular 60. One dealer (MAR nautic) lists it.
MotorMP10/12 · MP10/242,18,25,32—Pump motor 12 V / 24 V for the Zen 100, Smart 80 and Smart 100. The Zen 100 for 230 V takes MP10/230.
MotorMP15/2421,26—Pump motor 24 V for the Zen 150 and Modular 150.
Pressure switchPSP368,29,14,11,51—High-pressure switch on the diaphragm feed pumps of the Zen 30, the Zen 50 (Touch versions) and the Modular 60, set to about 9.5 bar.
Pressure switchPSP1031,18,25,4,52,53—High-pressure switch for the Smart 80, Smart 100, Modular 100 and Zen 100. The 2024 Zen 100 Touch manual still lists it, but Maritimo says it fits only Zen 100 units built before 2021, as later ones have the DPM16 transducer.
Pressure switchPSP1534,26,54—High-pressure switch for the Zen 150 (Touch) and the Modular 150.
TransducerDPM167,1,2,21,55,56—Pressure transducer (digital pressure meter), 0 to 16 bar: Zen 30, 50, 100 and 150 in the 2024 manuals, and Zen, Smart and Modular units of 30 to 150 l/h built from 2021.
Pressure gaugeM16B · M25B3,17,18,25,14,4,26—M16B, 0 to 16 bar: Smart 30, 60, 80 and 100, Modular 60 and 100. M25B, 0 to 25 bar: Modular 150. Zen units also have a 0 to 16 bar gauge, which dealers sell without a Schenker code.
HoseHPH · HPH23,17,18,25,14,4,26—Pair of high-pressure hoses. HPH: Smart 30, 60 and 80 and Modular 60. HPH2: Smart 100, Modular 100 and Modular 150.
Solenoid bypass valveEV/12 · EV/2457,58—Flushing solenoid valve on the carbon filter, 12 V / 24 V: it switches the inlet to tank water for the flush. One dealer (MAR nautic) lists it; check the code against chapter 8 of your manual.
Salinity testerPST7,1,2,17,4—Portable salinity (TDS) tester for every model; on Schenker’s spare list for long cruises.

Numbers checked against the sources below on 13 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Strainer cleanMesh strainer before the feed pump: check and rinse every 5 days of use1,17,4
Prefilter change5-micron cartridge: replace every 80–100 running hours according to the 2024 Zen manuals (the 2024 Zen 100 Touch manual still says 100–120 h), every 100–120 h according to the Smart and Modular manuals and the 2018 Zen 30 manual; sooner in turbid water. Then bleed the air: depressurisation valve open for 2–3 min7,1,2,21,31,17,4,11
Fresh-water washFlush with tank water after every run; stopping with the final flush is Schenker’s normal procedure. Flush again whenever the unit stands 10–15 days; Zen electronics left powered can flush on their own for 75 s every 7 days. Carbon cartridge of the flush line: replace once a year1,17,4,59
Hoses & clampsCheck hoses and fittings for leaks at every start-up1
Storage / winterisingLay-up longer than 2–3 months (Zen) or 3 months (Smart, Modular): circulate about 15 l of unchlorinated water with SC1 for about 20 minutes and leave it in; clean with SC2 first if the water smells of rotten eggs. The 2024 Zen manuals say not to use sodium metabisulfite1,17,4,11
WinterisingBelow 5 °C: after SC1, fill with about 15 l of propylene glycol solution, 45 % (down to −20 °C) or 55 % (down to −30 °C), and run 5 minutes. Never use ethylene glycol1,11
RO membraneMembranes: clean with SC2, then SC1, when the feed pressure creeps up or the water quality drops; replace them when cleaning no longer brings pressure and quality back. Average life 6–7 years1,59

From Schenker’s installation, use and maintenance manuals: the 2024 Zen editions, the 2018 Zen 30 edition and the Smart and Modular editions of 2018 to 2021, all hosted by the dealers MAR nautic and Maritimo. The prefilter interval differs between editions, so its row says which manual gives what. None of the manuals gives an interval for the ERS seal kits.

Specifications

ModelsZen 30 (also Race): 30 l/h, 110 W, 12/24 V DC · Zen 50: 50 l/h, 240 W, 12/24 V DC · Zen 100: 100 l/h, 400 W, 12/24/48 V DC or AC · Zen 150: 150 l/h, 600 W, DC or AC · Zen Twin 200/300: 200/300 l/h, 800 W / 1.2 kW · Smart 30: 30 l/h, 110 W · Smart 60: 60 l/h, 240 W · Smart 80: 80 l/h, 380 W · Smart 100: 100 l/h, 400 W (Smart 60 to 100 also AC) · Modular 60: 60 l/h, 240 W · Modular 100: 100 l/h, 400 W · Modular 150: 150 l/h, 600 W, 24 V DC or AC. Rated ±15–20 % at 25 °C and 35000 ppm sea water, salt rejection 99.5 %; product water usually under 400–500 ppm. Schenker rates it for sanitary use and advises UV or micro-filtration for drinking24,60,61,62,59
VersionsZen: Basic panel (start/stop, flush, timer), Mini Touch or Touch (automatic and periodic flush, hour counter, pressure; salinity and flow meter optional) · Smart and Modular: Basic, Digital or Touch. Touch panels can be shown on a chartplotter through Schenker’s MFD interface24,60,61,63
TypeReverse osmosis with Schenker’s Energy Recovery System (ERS). A low-pressure feed pump sends sea water through a mesh strainer and a 5-micron cartridge to the ERS, whose cylinders and automatic valve raise it to membrane pressure with the energy of the brine leaving the membranes; the valve switches with an audible beat and a 0.1–0.2 bar blip on the gauge. Feed pump: one Shurflo diaphragm pump on Zen 30 and Smart 30, two on Zen 50, Smart 60 and Modular 60; rotary-vane pump head with motor on Zen 100/150, Smart 80/100 and Modular 100/150. Zen: ERS, membranes and valves in one flat block; Smart and Modular: ERS, membrane vessels, valves and hoses separate11,1,2,3,18,14,64,24
Feed pressurePump high-pressure switch set to about 9.5 bar (Zen 30). Normal feed pressure on the gauge: Zen 30 and Zen 50 6.5–7.5 bar · Zen 100 7–8 bar · Zen 150 10–11 bar · Smart 60 about 7–7.5 bar · Smart 80 about 7–8 bar · Smart 100 and Modular 100 about 7.5–8.5 bar · Modular 60 (both pumps) about 6–7 bar · Modular 150 about 8–10 bar. Higher readings at normal sea temperature point to dirty filters or membranes7,1,2,21,17,18,25,14,4,26,11
Flow rateFeed pump: Zen 30 4.5–5 l/min · Zen 50 7.9–8.3 l/min · Zen 100 and Zen 150 15.6–16.6 l/min7,1,2,21
Current drawZen 30 about 9 A at 12 V, 4.5 A at 24 V · Zen 50 about 22 A at 12 V, 11.8 A at 24 V · Zen 100 about 33 A at 12 V, 17 A at 24 V, 11 A at 48 V · Zen 150 about 25 A at 24 V, 13 A at 48 V (all ±15 %)65,62,66,67
Power consumptionAbout 4 W per litre of fresh water (Schenker’s figure)59
WeightComplete kit: Zen 30 22 kg, Zen 50 31 kg, Zen 100 53 kg, Zen 150 62 kg, Zen Twin 200 102 kg, Twin 300 120 kg · Smart 30 25 kg, Smart 60 31 kg, Smart 80 35 kg, Smart 100 48 kg · Modular 60 38 kg, Modular 100 58 kg, Modular 150 69 kg24,60,61
Operating temperatureSea water 8–30 °C62,1,11
Inlet hoseZen 30 and Zen 50: 16 mm ID reinforced hose on the sea-water inlet and the brine outlet · Zen 100/150: DN20/22 on the pump side · product water (Zen): 1/4 in fitting for 6 × 8 mm hose7,1,62,66
WarrantyThree years according to Schenker’s home page; the FAQ page still says two years68,59
Years builtSchenker Italia, Naples, since 1998 · Smart range on sale by 2010 · Zen range since 201869,70,11,71

Good to know

  • End every run with the flush button rather than a plain stop: it pushes tank water through the membranes. If the boat stays unused for more than about two weeks, flush again, or leave a Zen powered with its 7-day automatic flush switched on.1,59
  • The gauge shows feed-pump pressure, not membrane pressure, and each model has its own normal band (see the specs). A reading that creeps up over weeks means filters or membranes are fouling; cold sea water raises it too, so compare readings at similar water temperatures. If the needle jumps by more than about 0.2 bar at each beat of the ERS valve, check the accumulator pre-charge (about 4 bar, Schrader valve) before suspecting the ERS.1,21,11
  • After fitting a new 5-micron cartridge, open the depressurisation valve slightly for 2 to 3 minutes to bleed the air out, and do the same every 15 to 20 days of normal use. Air in the ERS shows up as low output at normal or low pressure.1,17,4
  • There is no service interval for the ERS seals: Schenker calls the low-friction bands of its 2.0 seals no-wear components, and the manuals list the seal kit only among the spares for long cruises. Carry the kit for your model on a long passage rather than fitting it on a schedule.64,1,17
  • Avoid making water in harbours, river mouths or near coral: fine particles scratch the ERS, and that wear is not covered by the warranty. In silty water Schenker advises an extra 20-micron filter ahead of the 5-micron one; 5 NTU turbidity is the limit.1
  • Order spares with your serial number and the codes from chapter 8 of your own manual. Codes changed between production years (Zen 30 filters and kits, the pressure transducer that replaced the switch from 2021, the 2.0 seal kits, the 24 V feed pump from 2021), and dealers do not always use the manual’s code.7,11,46,53,33

On the marketplace

Looking for a part for Schenker watermakers? Post a wanted ad in the app — it is free, it sits on the live map, and boaters nearby who have the part aboard can answer.

Got spares you no longer need? List them in a minute. No commission, ever.

Get the app

Sources

  1. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  2. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  3. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Smart/Schenker_Watermaker_Sm…
  4. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Modular/Schenker_Watermaker_…
  5. mar-nautic.com/5-micron-filter-10-inch-schenker
  6. maritimo.at/schenker-f5-sedimentfilter-10zoll/78836
  7. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  8. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  9. mar-nautic.com/5-micron-filter-5-inch-schenker
  10. maritimo.at/schenker-f5r-sedimentfilter-5zoll/78834
  11. maritimo.at/media/14/38/42/1705845531/manual-zen30-12-24v.pdf
  12. mar-nautic.com/activated-carbon-block-filter-10-inch-schenker
  13. mar-nautic.com/activated-carbon-filter-5-inch-schenker
  14. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Modular/Schenker_Watermaker_…
  15. mar-nautic.com/membrane-m2521-en
  16. maritimo.at/schenker-original-membrane-m2521/80629
  17. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Smart/Schenker_Watermaker_Sm…
  18. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Smart/Schenker_Watermaker_Sm…
  19. mar-nautic.com/membrane-m2540-en
  20. maritimo.at/schenker-original-membrane-m2540/82361
  21. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  22. mar-nautic.com/membrane-4021-en
  23. maritimo.at/schenker-original-membrane-m4021/80630
  24. schenkerwatermakers.com/products/zen/
  25. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Smart/Schenker_Watermaker_Sm…
  26. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/Modular/Schenker_Watermaker_…
  27. mar-nautic.com/membrane-m4040-en
  28. mar-nautic.com/seal-kit-schenker-watermaker-zen-30
  29. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  30. mar-nautic.com/seal-kit-schenker-watermaker-zen-50
  31. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  32. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  33. mar-nautic.com/seal-kit-schenker-watermaker-zen-100
  34. mar-nautic.com/mediafiles/pdf/Schenker/Bedienungsanleitungen/ZEN/Schenker_Watermaker_ZEN_…
  35. mar-nautic.com/seal-kit-schenker-watermaker-zen-150
  36. mar-nautic.com/seal-kit-schenker-watermaker-smart-modular-30-80
  37. mar-nautic.com/Seal-Kits
  38. mar-nautic.com/seal-kit-schenker-watermaker-smart-modular-100
  39. mar-nautic.com/schenker-cleaning-product-sc-1
  40. mar-nautic.com/schenker-cleaning-product-sc-2
  41. maritimo.at/schenker-sc1-wasch-und-ueberwinterungsprodukt/78446
  42. maritimo.at/schenker-sc2-reinigungsprodukt/78447
  43. mar-nautic.com/cruising-kit-schenker-watermakers
  44. mar-nautic.com/12v-spare-pump-schenker-watermaker-30-60
  45. mar-nautic.com/24v-spare-pump-schenker-watermaker-30-60
  46. mar-nautic.com/24v-spare-pump-schenker-watermaker-30-60-from-2021
  47. mar-nautic.com/diaphragm-kit-schenker-diaphragm-pumps
  48. mar-nautic.com/pump-head-schenker-watermaker-100-150
  49. maritimo.at/schenker-pumpenkopf-sp10/82052
  50. mar-nautic.com/pump-head-schenker-watermaker-60-230
  51. mar-nautic.com/pump-pressure-switch-schenker-watermaker-30-60
  52. mar-nautic.com/pump-pressure-switch-schenker-watermaker-80-100
  53. maritimo.at/schenker-pumpen-druckschalter/81299
  54. mar-nautic.com/pump-pressure-switch-schenker-watermaker-150
  55. mar-nautic.com/dpm16-digital-pressure-meter-schenker-30-150l
  56. maritimo.at/schenker-drucksensor-0-16-bar/82161
  57. mar-nautic.com/electric-valve-12v-schenker-watermaker
  58. mar-nautic.com/electric-valve-24v-schenker-watermaker
  59. schenkerwatermakers.com/faqs/
  60. schenkerwatermakers.com/products/smart/
  61. schenkerwatermakers.com/products/modular/
  62. schenkerwatermakers.com/wp-content/uploads/2026/09/ZEN50_datasheet_2026_v1.pdf
  63. schenkerwatermakers.com/products/accessories/accessories/
  64. schenkerwatermakers.com/benefits/
  65. schenkerwatermakers.com/wp-content/uploads/2026/09/ZEN30_datasheet_2026_v1.pdf
  66. schenkerwatermakers.com/wp-content/uploads/2026/09/ZEN100_datasheet_2026_v1.pdf
  67. schenkerwatermakers.com/wp-content/uploads/2026/09/ZEN150_datasheet_2026_v1.pdf
  68. schenkerwatermakers.com/
  69. schenkerwatermakers.com/company/
  70. web.archive.org/web/20100216082221/http://www.schenker.it:80/pdf/SMART%2030.pdf
  71. mactramarine.co.uk/schenker-watermakers

Schenker is a trademark of its owner; boatparts.app is not affiliated with it. Part numbers are quoted for identification only. Spotted an error? Write to mail@boatparts.app.