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SimpleX Instantaneous 3 Phase Water Heater


German engineered hot water on demand.

The Stiebel Eltron SimpleX instantaneous electric hot water system makes replacing certain types of 3 phase electric hot water units an easy, quick and stress-free process. The Stiebel Eltron SimpleX hot water unit is suitable as a replacement 3 phase electric hot water system in one bathroom houses, as well as in factories and shops throughout Western Australia. The SimpleX offers silent water flow, energy efficiency and is ideal for replacing certain types of faulty and older 3 phase electric instantaneous water heaters.

German engineered design from Stiebel Eltron

  • Silent water flow
  • In-built water saving device
  • Hydraulically controlled
  • 7.5 Litres per minute delivers a 25 Degrees Celsius rise
  • WaterMark approved, Lic No. WMKA21273, AS3498
  • Ideal for single bathroom dwellings
  • Switch on flow rate of 4.5 litres per minute

Convenient installation

  • Compact in size, designed to be installed virtually anywhere an existing 3 phase heater is located, with identical dimensions
  • Uses existing plumbing, ideal as a replacement hot water system
  • No flue, ventilation or safe tray required
  • No pressure relief valve required
  • Compact design for space saving horizontal installation flexibility

When replacing hot water units its always a good idea to upgrade your old system. The SimpleX instantaneous hot water unit includes various features which save money, energy and water.  If you find yourself suddenly with no more hot water, the SimpleX is the simple and smart option for replacing your old hot water system.

Available in electrical size:

  • SimpleX - 4400w/ph, 20 Amps per phase, three phase 415V


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  • Available in Western Australia only
  • The SimpleX is a replacement hot water system for certain types of existing 3 phase electric instantaneous hot water units.
  • The SimpleX is a hydraullically controlled replacement type hot water system, for new builds or renovations please refer to our DHE, DEL or DHB-E hot water systems as these systems are suited to new builds.

Frequently Asked Questions

(Q 1 )
I have an old 3 phase instantaneous hot water system, will the SimpleX replace this?

Your electrician can advise what size the fuses are for your existing hot water unit, this will confirm the appropriate replacement model.  The SimpleX is 20 Amps per phase.

(Q 2 )
My SimpleX unit is fluctuating hot and cold in the shower, is it faulty?

Normally this only occurs with when a water saving shower has been installed. The restrictor in the shower causes back pressure on the unit causing it to switch on and off. Removal of the shower restrictor normally fixes this issue, the SimpleX unit has a built in restrictor that acts as a water saving device.

(Q 3 )
Can the SimpleX water heater be installed in new applications/buildings?

The SimpleX hot water system is hydraulically controlled and as such you may have fluctuation issues if installed in conjunction with water saving tapware and shower roses.

We recommend the use of an electronically controlled system such as the DHE, DHB-E or DEL 3 phase instantaneous water heaters for new applications and buildings.


(Q 4 )
Are spare parts available for the SimpleX instant hot water system?

Yes, our spare parts division can assist with parts for the DHF.  Our service and spart parts division can be contacted on 1800 153 351.

(Q 5 )
If I have an issue with my unit within the warranty period, who do I call?

Please call us on our 1800 153 351 number and follow the prompts for our service department.

(Q 6 )
Where can I purchase a unit?

All the major plumbing and electrical supply merchants can supply our products, please contact us on 1800 153 351 for your nearest supplier.

Model Number.


SimpleX Instantaneous 3 Phase Electric Water Heater
Type of System Three Phase Mains Pressure Electric Instantaneous
Power Output 4400w/ph
Electrical Installation As per AS3000
Rated Current 20 Amps
Rated Voltage 415V
Plumbing Installation As per AS3500.4.2 and local authority regulations
Permissable Operating Pressure                         1000kPa
Switch On Flow Rate (please note that this is the minimum flow required to turn the water heater on)

4.5 Litres Per Minute

WaterMark Approval Lic No. WMKA21273, AS3498
Water Connection 1/2" Male
Height 210mm
Width 360mm
Depth 125mm
Nominal Capacity 0.5 Litres



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