The Greenstar Highflow 440 is a floor standing, energy saving boiler, suitable for a large family home such as a 2 bath house with a regular requirement for 1 or more simultaneous draw offs of hot water. It has a built in condensate pump which increases boiler siting options. As a result it can be sited directly underneath a worktop as all servicing can be undertaken from the front of the boiler.

The boiler can be used to provide domestic hot water only when first installed with radiators added at a later date as you move to a full central heating system.

Worcester Bosch claim that 97% of the gas consumed by the Greenstar Highflow 440 combi boiler is converted into heat for the heating and hot water system. This is achieved by recycling exhaust gases to extract and reuse the latent heat they contain. As the gases pass through a heat exchanger they are cooled to 55 degrees as the latent heat is released and transfered back into the system. This approach also reduces carbon dioxide emissions into the atmosphere.

Greenstar Highflow 440 Ratings
SEDBUK Rating % 91.0 5 stars
Built in Frost Stat Yes 5 stars
Height 850 mm
Width 600 mm
Depth 600 mm
CH Output (kW) 29.2 kwh 5 stars
Maximum Flow Rate 20 litre/min 5 stars

The high hot water flow rate is also delivered at mains pressure enabling this boiler to provide a powerful shower.

It should be noted that the Greenstar Highflow 440 is supplied by the manufacturer as suitable for a sealed heating system with a 12 litre expansion vessel. This boiler can not be used on an open vent system. All hot and cold taps used with the Greenstar Highflow 440 must be suitable for operating pressures up to 10 bar (150 psi) and temperatures of 65 degrees .


  

20 Responses to “Greenstar Highflow 440”

  • Cristina Gritsch says:

    I have been told that floor standing boilers are to be phased out in the next couple of years. Could you tell me if this is true and why?

    We’re considering replacing our conventional boiler for a combi – is the Worcester greenstar highflow 440 a storage combi? We have a 3-bed end-of-terrace, 1bath house (2 people only), but are considering adding a one floor extension to probably include a further shower room. Would this boiler cope with, let’s say 1 shower and 1 tap opened at the same time?

    Thanks for your help.
    Cristina

  • Boiler Systems says:

    Open flued floor standing boilers have been phased out with effect from April 2005 under the revision to Part L of the building regulations.

    The reason is that they are not efficient even from new, to comply with the governments energy efficiency regulations all new or replacement central heating boilers have to be condensing boilers. This also means they are fanned flue boilers and must be mounted against an outer wall.

    You can get floor standing condensing boilers but they do have to be against an outer wall.

    The Greenstar Highflow 440 is suitable for a large 2 bath house with a regular requirement for 1 or more simultaneous draw offs of hot water. It does have a small storage facility to run off a sink full of hot water.

  • Mrs Barella says:

    I have a 4 story town house with central heating, I also have 5 bedrooms and 2 bathrooms. The combi boiler I have is an old one and I am thinking about replacing it as the water dose not flow properly to the 4th floor. The combi is on the 1st floor which is the kitchen could you please help and tell me which combi boiler I would need to have, for the correct preasure for the water to reach the 4th floor in the bathroom. The water flow to the other bathroom is ok as the water only has to go one floor. Any help would be greatful.

    Many thanks Mrs Barella

  • Boiler Systems says:

    The Greenstar Highflow 440 is suitable for a large 2 bath house with a regular requirement for 1 or more simultaneous draw offs of hot water. It has a flow rate of 20 litres per minute which is the best flow rate of any combi boiler in a domestic situation.

    There are other issues raised by your question, such as the water pressure, which can only be answered by a visit to your property to ensure that you receive an accurate boiler quotation based upon your property and the installation requirements. npower are able to send a Home Energy Consultant who are able to visit, free of charge and develop a no-obligation quotation for your needs. Can we suggest that you arrange a free, no-obligation home heating survey.

  • Victor Maylin says:

    JUST MOVED TO A 5 BEDROOMED, 5 GROUND FLOOR ROOMED VICTORIAN DETATCHED HOUSE WITH NO CENTRAL HEATING SYSTEM AND JUST AN EXISTING IMMERSION TANK FEEDING THE HOT WATER TAPS.ONE BATHROOM INCLUSIVE OF SHOWER AND SEPARATE SHOWER ROOM TO BE INSTALLED.

    IS THE GREENSTAR HIGHFLOW 440 SUITABLE ?
    REGARDS.

  • Boiler Systems says:

    The Greenstar Highflow 440 is suitable for a large 2 bath house with a regular requirement for 1 or more simultaneous draw offs of hot water. It does have a small storage facility to run off a sink full of hot water giving you instant hot water.

    To check that this would be suitable npower are able to send a Home Energy Consultant to your home to review the installation options and help to select the right boiler for your home. This visit is free with no-obligations on your part and will also enable an accurate quotation to be developed for a new boiler.

  • Paul Ormsby says:

    I have A Worcester 3.5 Highflow gas combi boiler installed in an upstairs cupboard with vented flue to roof. What are the options for a replacement at same location-not on external wall

  • Boiler Systems says:

    Almost all condensing combi boilers can be installed on an internal wall with a vertical flue, so the list of boilers available to you is quite varied. Any space limitations constraining the boiler dimensions and your requirements for hot water flow rates would then narrow the choice down.

  • M Jones-Griffith says:

    If we install a 440 Highflow with 1.5 bar water pressure, will pressure drop of in the shower be noticable if another hot tap/shower is operated at the same time?

  • Boiler Systems says:

    Contact would need to be made with the manufacturer, Worcester Bosch, to obtain an accurate answer to your question for a Greenstar 440 Highflow.

    Their contact details are telephone 08705 266241 fax 01905 752741

  • chas rogers says:

    Could you tell me the cost please

  • Boiler Systems says:

    Chas – we would have sent you an email but the email address you provided was incorrect.

    As per the frequently asked questions on the site it would be guesswork to quote a price without reviewing the property as the price includes the full installation costs. It is important to ensure that the right type of boiler is selected to meet the needs of your family and that the power rating is matched to your needs. npower would not wish to indicate a low quotation cost and then increase this as any installation challenges were identified.

    npower are able to send a Home Energy Consultant to your home to review the installation options and help to confirm the right boiler for your home. This visit is free with no-obligations on your part and will also enable an accurate quotation to be developed for a new boiler.

  • Roger Horsgood says:

    Hi
    Answer 2 states floor standing condensing boilers are fanned and must locate against an exterior wall but answer 8 states that condensing combi boilers can link to a vertical flue on an interior wall. Can a Greenstar Highflow 440 be linked directly into a standard flue as in a lined ex-chimney?

  • Boiler Systems says:

    As far as they are aware no fanned flue can go up through an old chimney or connect on to an existing flue as the old flue would be open and the new flues are room sealed, fanned and considerably smaller.

    If you wish to have a second perspective upon this you can contact the manufacturer,Worcester, direct to confirm this point for you.

  • anthony andrews says:

    hi, if i was to buy the greenstar 440 highflow, could i still use my multistove to heat my radiators wen i have the stove burning? thanks again anthony

  • Boiler Systems says:

    We doubt that you would be able but, as it is such a specific question, it is worth asking the manufacturer for a final opinion. Worcester Bosch have a technical helpline which you can call on 08705 266241.

  • mrs zoe petrazzuolo says:

    I have a worcester 24-28Si11 combi boiler which is approx 5yrs
    old and in the last 6 months i have had to replace the pump and memory board.My pilot light has gone out again and i have no hot water or central heating and i am not sure if i need to replace the whole boiler or just fix this one again. Can anyone give me any advise on what to do and if i do need to replace the whole thing then how much will it cost me?

  • Boiler Systems says:

    It is very difficult to diagnose central heating systems remotely, particularly on the limited diagnostic information available.
    If you have taken out a boiler service contract you should telephone the helpline number you have been provided with and an engineer will call to help remedy your problem. If you have not taken out any boiler service agreement npower have a gas boiler repair service which could help. If you telephone them and explain your issue you will be provided with a no obligation fixed quote for fixing the problem.

    It sounds as though you have a very problematic boiler as you should not expect faults like that after only 5 years. It is hard to know whether you should replace the boiler or not as we cannot predict its future reliability and the new components should operate correctly.

    If you decide that you are going to replace the boiler npower are able to send a Home Energy Consultant to your home to review the installation options and help to select the right boiler for your home. This visit is free with no-obligations on your part and will also enable an accurate quotation to be developed for a new boiler.

  • Darren Talbot says:

    I am in the process of buying my council house. When the sale has been completed one of the first jobs is to replace the boiler.

    I’m interested in a combi boiler and wondered if the installation charges cover the removal of the the old hot water tank and unnecessary pipework. There are also some pipes that are less than optimally placed which if possible I would like re-sited. Can this be done as an “all in one” job or would i need a separate plumber to do the job?

  • Boiler Systems says:

    The work can be completed at the same time and npower can quote for the removal of the older parts.

    It is important that a site survey is completed to accurately identify all the elements of the installation to ensure that the quote is accurate. When you are ready npower are able to send a Home Energy Consultant to your home to review the installation options and also help to select the right boiler for your home. This visit is free with no-obligations on your part and will also enable an accurate quotation to be developed for a new boiler.


  

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