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Worcester Bosch Greenstar CDi Highflow boiler – review

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Witten by Bernard Morgan (Engineer).
First Published: January 8, 2024. Updated: February 15, 2024

Boiler only price: from £2,498.24

(Boiler-only price: comparing up to five suppliers, including Screwfix and Plumbase, where possible. Correct January 2024).

The Worcester Bosch Greenstar CDi Highflow boiler is a floor-standing unit. It is a powerful boiler that can provide up to 25 litres of hot water a minute. Perfect for large homes with multiple showers and hot taps in use simultaneously.

About

The Worcester Bosch Greenstar CDi Highflow has been designed for homes with high hot water demand. To supply large amounts of hot water is quite large and heavy (over 100kg). It cannot be wall-mounted, instead it sits on the floor. Normally underneath a kitchen worktop.

Like most modern boilers Highflows can integrate with smart thermostats. Worcester Bosch does have their own EasyControl system.

The Highflow is part of the energy-efficient Greenstar range, which has won the Which? ‘Best Buy’ award multiple times

Key Features

  • This is a large, floor-standing boiler that has been designed for homes with 2+ bathrooms and high hot water demands
  • Fits underneath a standard kitchen worktop
  • Holds an ‘A’ energy efficiency rating and is over 90% efficient for heat and hot water
  • Includes frost protection so can be safely installed in home areas with less insulation, such as a loft space
  • Provides high hot water rates of up to 25 litres per minute
  • As a combination boiler, the Worcester Bosch Greenstar CDi Highflow does not require water storage or tanks
  • Comes with a wide variety of control options, including smart technology compatibility

Technical Specification

Manufacturer Worcester Bosch
Model Greenstar CDi Highflow
Variations 440CDi and 550CDi
Condensing Yes
Efficiency Rating 92%
Energy Efficiency Class A Rated
LPG Compatible Yes
Warranty 10 years
Central Heating Max. Output 29.2  or 30.6 kW
Hot Water Flow Rate 20 and 25 litres/minute
Mounting Floor standing
Weight 112 kg
Dimensions 850mm (Height) x 600 (Width) x 600mm (Depth)
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Our thoughts

The Greenstar CDi Highflow boiler is designed for larger homes. It is a reliable boiler engineered to provide energy-efficient hot water and heating.

440CDi and 550CDi

The main difference between the two versions is the hot water flow rate. The 440 can produce 20 litres a minute, whilst the 550 can produce 25 litres of hot water per minute.

Very large and heavy

Like a washing machine or a dishwasher and a weight of over 100kg, this is a very large and heavy boiler. For this reason, it is a floor-standing boiler and won’t fit in a kitchen cupboard. Instead, it is more suited to being housed in a recess where a washing machine or a dishwasher could go.

A name you know

Worcester Bosch is a name you will know. The company has been offering boilers to the UK market since the 1960s. Throughout this time, they have developed an excellent reputation. However, it should be noted that the quality of some of their boilers is not what it once was.

Aluminium heat exchanger

Aluminium heat exchangers are not as good as stainless steel equivalents. They have good initial performance but they can lose 10% efficiency over 10 years. Aluminium heat exchangers are susceptible to rust and corrosion. This affects efficiency.

Some of these issues could be covered by the warranty. However, if the water in your heating system isn’t kept in good condition it could cause issue which are not covered. It’s also worth noting that any issues after the warranty period may be very expensive.

Accessibility

There can be issues with access depending on how the boilers are installed. This is because the boiler is so large. However, if it’s installed with ample space, the removable side panels provide access when the boiler requires servicing or repairs

Choose from a range of control options

With the CDi Highflow boilers, you can opt for the standard manual control panel featuring an LED display. You also have the option to install a complimentary smart heating system. Utilising smart technology, you can control heating remotely with apps on your phone.

Assembled in the UK

The Greenstar CDi Highflow is assembled in the Worcester Bosch production facility in Worcestershire. But, whilst it is assembled here, many of the parts are manufactured elsewhere by 3rd party companies.

Plastic parts 

Many of the parts and components utilised within this boiler are made from plastic. These parts can fatigue easily over time causing issues. If serviced correctly every year, this may not be an issue, but often, boilers are not serviced correctly. We would recommend boilers with brass and copper internal components where possible.

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