Worcester Bosch Greenstar Highflow CDi Combi Boiler

The Worcester Bosch Greenstar Highflow CDi Combi is a SEDBUK A-rated floor-standing boiler that is designed for large homes with two bathrooms.

When it comes to floor-standing combination boilers, they don’t come much better than the Greenstar Highflow CDi Combi by the UK’s favourite boiler brand Worcester Bosch. Like each of the boilers in the Greenstar gas-fired range, this high-performance model has even won a Which? Best Buy award. If you live in a large home with multiple bathrooms, the impressive Greenstar Highflow CDi Combi boiler with industry-leading hot water flow rates could be the ideal choice.

How Much Does this Boiler Cost?

As always, the cost will depend on the size (heat output) of the boiler. The Worcester Bosch Greenstar Highflow CDi Combi comes in two versions of 440CDi and 550CDi with outputs of 29kW and 30kW respectively, so you’ll need to find out which size is best for your home before knowing how much cash you’re going to need to spend. However, we can tell you that the 440CDi unit is approximately £2,053.68 and the 550CDi version is around £2,447.70. These guide prices do include VAT but not the cost of installation.

How will I know if this Boiler is Suitable for My Home?

As the Greenstar Highflow CDi is a combination (combi) boiler, it produces hot water on demand and doesn’t require any additional components. Because it takes water directly from the mains, you won’t need a hot water storage cylinder in the airing cupboard or tanks in the loft. The 29kW unit will supply 20 litres of water per minute, while the 30kW version will provide 25 litres per minute. Most combi boilers are suitable for smaller homes, but this fabulous piece of technology is available in large heat outputs and can meet the heating and hot water requirements of a medium or large property with two bathrooms.

The most sensible thing you can do to determine whether or not the Worcester Bosch Greenstar Highflow CDi Combi or any other gas-fired boiler is suitable for your home is to ask a Gas Safe registered engineer. A qualified heating professional will be able to assess your home and needs to help you choose the right boiler type, size and model.

Is it a High Efficiency Boiler?

It certainly is. The Worcester Bosch Greenstar Highflow CDi is, in fact, an A-rated floor-standing gas-fired condensing combi boiler with an ErP rating over 90% for efficiency. In addition to achieving the highest possible efficiency rating, this model is recommended by the Energy Saving Trust. What does this mean for you, the homeowner? Well, by replacing an old inefficient boiler with this energy efficient model, you’ll save a chunk of money on your energy bills.

Does this Boiler have a Good Range of Controls and Features?

Yep. The Greenstar Highflow CDi Combi has concealed user controls including separate central heating and hot water temperature controls, as well as a reset button, system pressure gauge and on/off switch. This model is also compatible with a range of Worcester Bosch optional controls, such as programmable room thermostats and the internet-connected Bosch EasyControl that lets you effectively control and monitor your heating and hot water use from a smart device or phone. Boiler features include frost protection, a roll-in tray and built-in condensate pump and filling link.

How long is the Warranty on this Boiler?

When you purchase the Worcester Bosch Greenstar Highflow CDi Combi, you’ll receive a 5-year parts and labour guarantee as standard. The guarantee must be registered within 30 days of installation, which can be done online at the Worcester Bosch website.

Worcester Bosch Greenstar High Model Range

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Greenstar Highflow 440CDiCombiH - 850 mm
W - 600 mm
D - 600 mm
20 l/min29 kWA 90% and above£1710.16
greenstar highflow 29CDi CombiH - 850 mm
W - 600 mm
D - 600 mm
25 l/min29 kWA 90% and above£2000
Greenstar Highflow 550CDiCombiH - 850 mm
W - 600 mm
D - 600 mm
14.3 l/min30 kWA 90% and above£2033.58
greenstar highflow 30CDi CombiH - 850 mm
W - 600 mm
D - 600 mm
25 l/min30 kWA 90% and above£2400

Summary of Important Information

  • Prices range between £1700.00 and £2,447.70
  • Heating output of 29kW or 30kW
  • Hot water flow rates or 20 or 25 litres per minute
  • Dimensions of 850mm (H) x 600mm (W) x 600 (D)
  • A-rated for efficiency
  • Smart compatible
  • 5-year warranty as standard

Pros and Cons

There isn’t a single thing we don’t like about the Worcester Bosch Greenstar Highflow CDi combi, so you won’t find any negative points here. Below, you’ll find a list of pros and all the things we really like about this fabulous combination boiler.

  • Overall Which? score of 86%
  • Fits underneath a standard kitchen worktop
  • Suited to large homes with high heating and hot water demands
  • Strong heat outputs and industry-leading hot water flow rates
  • No need for separate cylinder or loft tanks
  • Compatible with Bosch EasyControl – can tailor hot water times and heating temperatures even when you’re not at home
  • Roll-in tray to minimise the risk of floor damage
  • Simple boiler controls and clear temperature display
  • Environmentally friendly and highly efficient – will reduce carbon footprint and energy bills
  • Lengthy manufacturer warranty