• German engineered design
  • 7.5 Litres per minute delivers a 25 Degrees Celsius rise
  • Hydraulically controlled
  • Switch on flow rate of 4.5 litres per minute
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Product Overview

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 in Perth. The STIEBEL ELTRON SimpleX hot water unit is suitable as a replacement 3 phase electric hot water system in one bathroom houses. 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.

Product Details

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

Available in electrical size:

  • SimpleX 13.2kW, 20 Amps per phase, three phase 415V

Technical Data

PLEASE NOTE: The Simplex water heater is only available in Perth Western Australia as a replacement system for certain types of existing three phase electric instantaneous water heaters.
Model number SimpleX
Rated output (415V) 13.2kW
Rated current (415V) 20Amp
Phases 3P/PE
Electrical Installation As per AS/NZS3000
Installation requirements AS/NZS3500.4.2 & local requirements
Switch on flow rate (minimum flow rate required to switch on the water heater) 4.5L/min
Permissible operating pressure 1000kPa
Temperature adjustment N/A
IP Rating IP24
Height 210mm
Width 360mm
Depth 125mm
Water connection 1/2" male thread
Colour white
Nominal capacity 0.5L
Approvals WaterMark Lic No. WMKA21273, AS3498
For one/several draw off points Yes/Yes
Heating system Copper Tubular


File Category Type Download
Simplex Data SheetData SheetPDF
487.19 kB
Simplex Operation and Installation GuideOperation and Installation GuidePDF
905.03 kB
Simplex WarrantyWarrantyPDF
110.68 kB
Simplex Tech Line DrawingTechnical DrawingJPG
948.65 kB
Simplex Exploded DiagramExploded DiagramPDF
191.14 kB
Simplex Serial LocationSerial Number LocationPDF
108.31 kB


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.

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.

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 newer models that are electronically controlled, such as the DHE AU, DHB-E AU or DEL AU, three phase instantaneous water heaters for new applications and buildings.

4.  Are spare parts available for the SimpleX instant hot water system?

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

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 customer service department.

6. Where can I purchase a SimpleX water heater from?

The SimpleX water heater is available from all leading plumbing stores.

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