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Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers


About Worcester Bosch

A professional company with a wealth of experience, Worcester Bosch is a market leader in the boiler industry providing a wealth of products that are compatible with gas, oil and propane (LPG) fuels. Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes

Each boiler’s specification determines its suitability with different hot water and central heating demands. 

As part of the Bosch Group, Worcester Bosch prides itself on manufacturing products that are both high in quality and reliability.

The business’s commitment to consistently provide customers with excellent boiler systems is reflected in its high rating on TrustPilot.


Greenstar Range

The Greenstar range is a selection of environmentally conscious, cost-efficient boilers created by Worcester Bosch.

The Highflow 440Cdi, in particular, is a popular picking from the Greenstar range, and awarded the title of ‘Best Buy’ by Which? A well known platform which seeks to protect the interests of consumers, and identifies businesses and valuable products worth praising.


Cost of Boiler and Installation 

While shopping for the 440Cdi, you can expect the price to start from £1600.

To install the 440Cdi boiler, you’ll need to hire a Gas Safe registered engineer, with a proven track record, to ensure the task is completed correctly and safely. Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes

As with the price of the boiler, installation costs can vary too. The price can range from £1,500 to £1,800.

If you would prefer your boiler to include installation fees, go to 


Home Compatibility


The Gas Greenstar Highflow 440Cdi Boiler is more significant than other compact boilers, the dimensions being 850 x 600 x 600.

While looking at measurements for the 440Cdi, and sizing up your available space to place the boiler, it’s important to note a clearance is required. Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes

For the 440Cdi, there must be 15mm at the top, 5 mm on the sides and at least 25 mm at the front.

Allowing a clearance is for ease of installation and safety measures, to ensure if needed, that a Gas Safe registered engineer can access and diagnose the boiler if required.



If you need a boiler that will meet the hot water and heating demands of a larger property, the 440Cdi provides an output of ;


  • Central heating output 7.4kW – 29.2kW.
  • Hot water flow rate – 20 litres per minute at 35 degrees celsius.


In simpler terms, the 440Cdi will cater effortlessly for homes with five bedrooms or more and two or more bathrooms. 



The efficiency of a boiler marks its ability to save cost, but to also reduce carbon emissions and preserve the environment.

The 440Cdi has the highest efficiency rating of SEDBUK ‘A’ and an ERP ‘A+’ rating too. Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes

Optimum efficiency translates to cheaper energy bills for you, and less damage caused to the world’s resources and atmosphere.



If you purchase the 440Cdi, you can select from a range of controls to find the one that best suits you and those you live with.

Worcester Bosch defines the control ranges as mechanical, comfort, sense and easy. Having a boiler that’s simple and easy to control is a big plus. Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes



Other features and benefits of the 440Cdi that support the output and efficiency mentioned above are as follows;


  • Built-in condensate pump
  • Easy to use electronic ignition
  • Fault finding diagnostics
  • A multi-directional flying control system controls hot water and central heating temperatures.
  • A range of compatible controls to choose from
  • A modulation ratio 1:7, meaning fewer ignitions and increased reliability
  • Frost protection – important for boilers installed in the garage or cellar
  • An easy to read temperature display
  • Instant hot water supply
  • Integrated filling link
  • Combi boilers, heat water from the main pipes, eradicating the need for a hot water storage cylinder or water storage tank



When purchasing the 440Cdi, you’ll receive a two-year warranty which covers faults and defects.

For extra peace of mind, if you buy the Greenstar System Filter (which filters contaminants from the heating system), you can extend the warranty up to 7 years which is an investment certainly worth thinking about.  Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers Compare Boiler Quotes

Always remember to read the guidelines which you can read here to keep the warranty valid.


On reading the above points, you can see why Worcester Bosch Gas Greenstar Highflow 440Cdi Boilers are a popular combi boiler pick for those who need a system that provides instant hot water for a variety of people in the same household.

The 440Cdi is designed to maximise your home’s comfort, providing you with an essential on-demand resource at any time of day. Coupled with reliability, a guarantee and the prospect of saving money on energy, the 440Cdi is an excellent choice.


If you would like a boiler quote or any information click here 


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What our customers think

5 Stars on Trustpilot

Would recommend

Stressed when needed a new boiler but easy process with affordable finance. New boiler installed within a few days with option for next day.

Paul Jones 5 Star on Trustpilot

We were very impressed

On the day, they came on time. Lovely people, they kept everything clean. Explained everything to me. No mess, kept me informed.

Anne Cross 5 Star on Trustpilot

Great Experience

Great experience - quick to arrange, easy to work with the very responsive online team and all installed faster than expected.

Ms Baxter 5 Star on Trustpilot

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