Email Support

Call Support

(02) 9810 9030

Working Hours

Mon - Fri 0700 - 1600


National Marine is the sole distributor of HP Watermaker and the Demi5. We are also an approved installer of the Idromar Watermakers.

The compact design of watermakers makes them perfect for retrofitting to your boat and offers you another vital piece of equipment that can give real benefits whilst cruising.


Benefits of the DEMI5® system

  • Eliminates limestone, solids suspended up to 5 microns, and chlorine
  • Eliminates limestone flakes during washing
  • Save time for surface drying
  • It prevents lime deposits in hydraulic systems that use fresh water
  • It protects from boiler corrosion, pumps, washing machines, toilets, faucets
  • It avoids the maintenance of hydraulic systems due to limestone
  • Saving money on board maintenance
  • Ecological because it does not pollute
  • It works without electricity
  • Portable, lightweight and ergonomic
  • Easy to use and maintain
  • Constructed with corrosion-resistant materials
  • Built-in instruction manual


The Sydney Boathouse,
29 James Craig Road, Rozelle,
NSW, 2039
(02) 9810 9030