Stiebel Eltron DEL-27 AU Electic Hot Water System


SKU: 233742 Categories: , , Brand:
50 degree Celsius instant hot water on demand

The STIEBEL ELTRON DEL AU three-phase 415V electric mains pressure instantaneous hot water systems provide instant hot water up to a maximum of 50°C with the reliability you have come to expect from STIEBEL ELTRON. These instant hot water heaters utilise sophisticated electronic technology to maintain a hot water delivery temperature not exceeding 50°C in accordance with AS3498. This overcomes the need for a separate tempering valve in situations where 50°Celsius hot water is required.


  • Made in Germany, designed for Australian conditions
  • Temperature selection up to a maximum of 50°C in accordance with AS3498, overcoming the need for a tempering valve
  • Accurate hot water temperature through 3i Technology
  • Barewire element suitable for hard and soft water areas
  • Instantaneous, endless supply of hot water


Model number DEL 18 AU DEL 27 AU
Rated output (415V) 19.4kW 28kW
Rated current (415V) 27Amp 40Amp
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) 2.5L/min 2.5L/min
Permissible operating pressure 1000kPa 1000kPa
Temperature adjustment 30-50°C 30-50°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) 4kg 4kg
Colour white white
Nominal capacity 0.4L 0.4L
Flow rate limiter (if fitted) L/min 7.5 (blue) | 12 (brown) 7.5 (blue) | 12 (brown)
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
Electronic air detection system Yes Yes
Accepts pre-heated water (solar) Yes (incoming water must not exceed 45°C)
Programmable temperature Yes Yes
Wellness shower programs
ECO energy & water function
Engineering excellence from STIEBEL ELTRON
  • Made in Germany, designed for Australian conditions
  • Electronically controlled to accurately regulate the water temperature
  • Electronic safety system with air detection
  • LED display shows hot water temperature selection
  • Memory function and TMax function for premium comfort and safety
  • WaterMark Lic No. WMKA00301, AS3498
Efficient by design
  • Heats water to a maximum of 50°C
  • Point of use installation saves water by not waiting for hot water to arrive at the outlet
  • The three-phase water heater saves power due to the fact that no water is stored
Installation flexibility
  • Maximum hot water output temperature 50°C, no tempering valve needed (approved to AS3498)
  • Bare wire element provides quick control over the water temperature and is suitable for hard or soft water areas
  • Compact in size for space saving installation
  • No safe tray required
  • No ventilation required
Available in electrical size:
  • DEL 18 AU – 19.4kW, 27 Amps per phase, three phase 415V
  • DEL 27 AU – 28kW, 40 Amps per phase, three phase 415V
  • 5 year full parts and labour domestic warranty*



Additional Information
Weight 5 kg
Dimensions 15 × 50 × 30 cm
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