Bosch 21e highflow Gas hot Water

Bosch are a leading name in the industry and have been supplying Australians with hot water systems for more than 50 years. They have a range of highly reliable and efficient hot water systems and they are constantly improving their design and technology in order to deliver state of the art appliances. Bosch have a range of continuous flow hot water systems, and actually pioneered the original continuous flow water heating technology in the late 1800’s.

The Bosch 21e Highflow is a gas continuous flow hot water system that is suitable for medium sized households. It is able to provide 21 litres of hot water every minute, which is enough water for households with one to two bathrooms. Continuous flow hot water systems only heat the water when it is needed rather than storing it, meaning that the hot water supply never runs out. As long as there is power and water connected to the house, there will always be hot water available when a hot tap is turned on. Households with two bathrooms will even find that both showers can be used at the same time, without the water running out.

The Bosch 21e Highflow is a suitable hot water system for households that are on a budget and are conscious of their impact on the environment. The system is a highly energy efficient with an energy rating of 5.56 stars. Because the system only heats the water when it is required, you are only paying for the gas that is needed. Anyone switching from an older gas or electric storage water heater will especially notice a reduction of their energy expenses. The system is also designed to have less negative impact on the environment, and has much less emissions than traditional storage water heaters. Natural gas is also a good option for the environmentally conscious because it is a clean form of highly efficient energy with less greenhouse emissions.

Bosch 21e Highflow Gas Hot Water System
The Bosch 21e Highflow has the following features:


  • Model number – YS2170RAH
  • Number of bathrooms – 1-2
  • Energy rating – 5.56 stars
  • Ignition – electronic
  • Installation type – external
  • Flow rate at 25°C rise – 21 litres/minute
  • Minimum inlet water pressure – 100 kPa
  • Maximum inlet water pressure – 1000 kPa
  • Hourly gas consumption – 170 Mj/hour
  • Minimum flow – 2.5 litres/minute
  • Antifrost – standard
  • Gas type – LPG/NG
  • Warranty on heat exchanger – 10 years

  • Unit height – 520mm
  • Unit width – 350mm
  • Unit depth – 170mm
  • Weight when empty – 19 kg

The compact design of the Bosch 21e Highflow makes it able to be installed in households that have limited outdoor space. Compared to large storage hot water systems, this small unit will free up wall and ground space. Being compact also makes it easier to install, reducing the cost of installation. This system also has optional temperature controllers available, which allow you to make the most of the hot water system by selecting the desired temperature. This also saves water, as there is no need to waste water trying to adjust taps to get the right temperature. This unit has the benefit of having antifrost as a standard feature, making it suitable for colder climates.

Bosch offer generous warranties on all of their hot water systems because they are confident that their high quality appliances will last. The Bosch Highflow 21e has an excellent 10 year parts warranty on the heat exchanger, along with a 3 year labour warranty on that heat exchanger. Additionally, Bosch offers a 3 year parts and labour warranty on all other components of the hot water system.


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