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Bosch 21e Electronic Highflow Antifrost - Continuous Flow Hot Water

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Quick Overview

Bosch continuous flow systems only heat the water you need, so you will never run out . Your entire household can shower consecutively without anybody enduring a cold shower!

The Bosch Electronic Highflow 21e unit is compact, space-saving and easy to install. It is suitable for 1-2 bathroom homes.

Features & Benefits

  • Now 6.1 Star energy efficient
  • Delivers 21 L/min at a 25°C temperature rise
  • Install up to 4 optional temperature controllers
  • Available in Natural or LP Gas
  • 50°C limited model or 55°C+ Model option
  • Antifrost included on all models
  • External installation only
  • Not Solar compatible
  • Domestic Warranty
    • 3 Years Parts and Labour
    • 10 Years on Heat Exchange (part only)
  • AGA Certification to AS 4552: 7032

Star Rating
Bosch 21e Electronic Highflow Antifrost - Continuous Flow Hot Water

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Continuous flow hot water systems are more compact in size than traditional storage hot water units. The 21e is Installed externally and pipes can be completely concealed completely with the optional Pipe Cover or the unit recessed into the wall with a lockable or fully enclose recess box. See the options to the right under Related Products.

Electronic continuous flow systems can also provide you with a precise temperature adjustment feature through the use of up to 4 temperature controllers. No need to mix hot and cold water. Simply select the temperature you desire and turn on the hot water tap. The bathroom controller has a maxium temperature of 50 degrees and the precise temperature control means you can select a safe temperature for your children’s bath with complete confidence.


Part Number YS2180RA
Installation External
Ignition Electronic
L/min (25°C rise) 21
No. of bathrooms 1-2
Min. operating inlet water pressure (kPa) 200
Max. inlet water pressure (kPa) 1000
Mj/H 159
Antifrost Standard
50°C Limited Part Number YS2180RA5*
Gas Type NG/LPG
Electrical Supply 230 VAC - 240V 50 Hz (10amp weatherproof power point required within 500 mm of the unit)
Unit Height (mm) 520
Unit Width (mm) 350
Unit Depth (mm) 170
Carton Weight (Kg) 19
Pipe Connection Size  
Natural gas (NG) 20 mm (3/4”)
LP gas 20 mm (3/4”)
Cold Water 20 mm (3/4”)
Hot Water 20 mm (3/4”)


Additional Information

Additional Information

Energy Star Rating 6.1

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Bosch 21e Electronic Highflow Antifrost - Continuous Flow Hot Water 0 out of 1 5 based on ratings. user reviews.