DHB-E 18 AU / DHB-E 27 AU

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DHB-E 13 / 18 / 27 LCD
  • New generation DHB-E
  • Made in Germany
  • Electronically controlled
  • Accurate continuous flow temperature delivery selection between 20 and 60 °C
  • Suitable for hard and soft water areas
View DHB-E 13 / 18 / 27 LCD
  • Made in Germany
  • Electronically controlled
  • Space saving design
  • Suitable for hard or soft water areas
  • Rotary dial with temperature selection between 30-60°C
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Product Overview

Instant hot water up to the performance limit

The STIEBEL ELTRON DHB-E three-phase electric instant hot water heater offers the comfort settings of an electronically controlled instantaneous water heater. With 3i Technology, there are three sensors that actively control the hot water output. This compensates for temperature fluctuations in the water supply delivering a pleasant hot water experience. The DHB-E saves energy by heating water only when required, unlike storage water heaters that are constantly heating and reheating water to maintain the desired temperature.

Available at:
Or your local plumbing supply store.

Product Details

High quality engineering

  • Made in Germany
  • Electronic safety system with air detection
  • Bare wire element is suitable for hard and soft water areas
  • WaterMark Lic No. WMKA00301, AS3498
  • Electronically controlled

Flexible installation

  • Space saving design
  • No safe tray or ventilation required

Available in two electrical sizes:

  • DHB-E 18 AU - 19.6kW, 27 Amps per phase, three phase 415V
  • DHB-E 27 AU - 28kW, 40 Amps per phase, three phase 415V


  • 5 Year full parts and labour domestic warranty*

*Conditions apply - refer warranty policy for full details.

Technical Data

Model number DHB-E 18 AU DHB-E 27 AU
Rated output (415V) 19.4kW 28kW
Rated current (415V) 27Amp 39Amp
Phases 3/PE 3/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) 3.0L/min 3.0L/min
Permissible operating pressure 1000kPa 1000kPa
Temperature adjustment 30-60°C 30-60°C
IP Rating IP25 (IP24 at electrical connection finished walls) IP25 (IP24 at electrical connection finished walls)
Height 478mm 478mm
Width 225mm 225mm
Depth 105mm 105mm
Weight (filled with water) 5.5kg 5.5kg
Colour white white
Nominal capacity 0.4L 0.4L
Flow rate limiter (if fitted) L/min 7.5 (blue) 8.5 (green)
Approvals WaterMark Lic No. WMKA00301, AS3498
For one/several draw off points Yes/Yes Yes/Yes
Heating system Bare wire Bare wire
Electronic flow rate control No No
Electronic air detection system Yes Yes
Accepts pre-heated water (solar) No No
Programmable temperature No No


File Category Type Download
DHB-E AU Data SheetData SheetPDF
761.21 kB
DHB-E AU Operation and InstallationOperation and Installation GuidePDF
9.19 MB
DHB-E AU WarrantyWarrantyPDF
110.53 kB
Revit file of STIEBEL ELTRON's DHB-ETechnical DrawingRFA
392.00 kB
STIEBEL ELTRON Tech Line Drawing DHBETechnical DrawingJPG
1.84 MB
STIEBEL ELTRON Exploded Diagram DHBEExploded DiagramPDF
224.18 kB
Model & Serial Number LocationSerial Number LocationPDF
141.08 kB


1. How do I know if I have 3 phase power available at my property?

Contact your local energy provider and inform them of your address. They will be able to let you know if you have three-phase power available at your address.

2. I have 3 phase power at my property, can I install a DHB-E instant hot water system?

You will need to check with your electrician to find out how much 3 phase power is available in "Amps per phase". The DHB-E 18 AU water heater requires 27 Amps per phase, whereas the DHB-E 27 AU requires 40 Amps per phase.

3. I have a 3 phase electric instantaneous unit I want to replace, what STIEBEL ELTRON system should I select?

You will need to confirm the amperage supply to the hot water unit from the circuit breaker in the switchboard. Please contact us to confirm the appropriate instantaneous electric hot water system.

4. What size instantaneous electric water heater do I need for my apartment or house?

As a general rule, the instant hot water system required will be based on the number of hot water outlets the hot water system needs to service, along with the incoming cold water temperature. As a general guide in an apartment/house with 1 bathroom, a 19.4kW three-phase electric instantaneous water heater (e.g. DHE 18 AU, DEL 18 AU or DHB-E 18 AU) is suitable. In a house with 2 bathrooms, a 28-29.1kW three-phase electric instantaneous water heater (e.g. DHE 27 AU, DEL 27 AU or DHB-E 27 AU) should be selected.

5. How can I tell if I have a DHB-E 18 AU or a DHB-E 27 AU?

Underneath the dial that adjusts the temperature there is a flap that pulls forward and then drops down. A rating label is located up under the flap showing the model and size - DHB-E 18 AU or DHB-E 27 AU. Within the downloads section of the DHB-E you can download a pdf showing you exactly where and how to locate this sticker.

6. What hot water temperature can the DHB-E AU water heaters deliver?

The DHB-E 18 AU and DHB-E 27 AU can deliver hot water at 60 degrees Celsius. If supplying hot water for a domestic bathroom, the plumbing regulations require the installation of a temperature control device to supply water not exceeding 50°C. Alternatively, the STIEBEL ELTRON DEL AU instantaneous electric water heater may be a suitable choice which delivers hot water not exceeding 50 degree Celsius in accordance with AS3498. Click on the DEL AU product to find out more.

7. Where can the DHB-E AU instant hot water system be installed?

The water heater can be installed almost anywhere due to its compact size. The water heater does not require ventilation, relief drain or safe trays so it can be installed in a cupboard, in the roof space, below the sink, in a service cavity, in a Euro laundry just to name a few options. If installing outdoors the hot water system must be protected from the elements by a protective covering such as a meter box.

8. How far can the water heater be installed from the hot water outlet?

The DHB-E AU water heaters are designed to be installed as close as practical to the most used hot water outlet. Installing closer to the point of use can help to save water and energy by delivering hot water quickly to the outlet. The STIEBEL ELTRON three-phase electric instantaneous water heaters are designed to service multiple outlets located several metres away from the system.

9. How efficient is an instantaneous electric water heater compared to an electric storage hot water system?

Compared to a storage hot water unit an electric instantaneous water heater can be up to 30% more efficient. This is due to the water heater not storing any hot water and having heat losses from storing a body of hot water.

10. Where can I purchase a DHB-E AU water heater?

The DHB-E AU water heater range is available from all leading plumbing stores.

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