Are you looking for the best flow rates you can get from a combi boiler?

If you have a large home with multiple bathrooms and want the best of the best, you may already be casting your eye on the Worcester Bosch Greenstar CDi Highflow range.

As an experienced heating engineer, I’ve actually got one of these boilers installed in my own home, which says a lot! And mine hasn’t skipped a beat for 9 years.

Below, I’m going to tell you more about this amazing range of boilers from Worcester Bosch, including all the technical info you need to know if you’re considering this boiler for your home.

Introduction

The Worcester Bosch Greenstar Highflow CDi 440 and 550 are both high capacity condensing combis that replaced the older models of the same range; the 400 and 500. These boilers were introduced to be much more energy efficient, as well as to supply faster, more powerful flow rates to your taps.

These boilers are absolutely ideal for larger homes and families where you don’t even want to think about the possibility of running out of hot water. They’re also incredibly reliable, which is no surprise from premium brand Worcester Bosch (voted Which ‘Best Buy’ for six years running).

Output and flow rate

Firstly, let’s take a look at some of the technical information and flow rates you can expect from the Highflow range:

• Greenstar CDi Highflow 440: This boiler provides an output of 29kw to the heating and 29.5kw to the hot water at 20 litres of hot water per minute (35 degrees Celsius)
• Greenstar CDi Highflow 550: This boiler supplies an output of 30kw to the heating and 41.1kw to the hot water at a whopping 25 litres of hot water per minute (35 degrees Celsius)

Size and special features

Both of these models measure in at 850mm x 600mm x 600mm, making them the size of a standard washing machine. And just like a washing machine, they can easily fit under a standard kitchen unit – alternatively, you can place them in a walk-in cupboard, basement or garage.

The Highflows have been built in a way that makes them easy to access for servicing (always a winner with engineers like moi) and they can be flued vertically or horizontally – giving you more options of where to locate them.

Guarantee

Just like all of Worcester Bosch’s CDi models, these boilers come with the best no quibble 10-year boiler guarantee on the market right now when fitted with Worcester Bosch Greenstar filter and controls – which are also covered for 10 years.

Please note that in order to qualify for the full 10 years, your boiler must be serviced annually by a Gas Safe registered engineer.

Ideal for

Best pay attention to this next part, as I’m about to tell you the type of home each of these boilers is best suited to:

• CDi Highflow 440: Ideal for a large homes with multiple bathrooms and 10 – 14 radiators
• CDi Highflow 550: Best suited to a large home with multiple bathrooms, 10 – 14 radiators and a high hot water demand (for multiple people using baths and showers at once)

The only real difference between these boilers is the flow rate, and although the 440 will be more than enough for most properties, if you have a large family who is always using up your hot water, you may want to size up to the 550.

TIP: Please note this is a rough guide, and you should always ask your chosen engineer to measure the needs of your individual home to be 100% sure you’re making the right decision – including your home’s incoming water pressure.

ERP rating

Both CDi Highflow boilers are ERP rated A, providing your home with optimal energy efficiency and performance – which means lower carbon emissions!

Conclusion

I hope you’ve enjoyed reading my overview of the Worcester Bosch Greenstar CDi Highflow range, and you should now have a better idea of whether or not these boilers are suited to your type of home. However, if there’s anything you’re unsure about, feel free to leave a comment and I’ll reply ASAP.

What do you think of the Greenstar Highflow range? I’d love to hear from you!