The Worcester Bosch Greenstar 4000…
Finding your perfect boiler can be a daunting task. Especially when manufacturers release new models, all promising to be better than their previous models, and the competition.
And Worcester Bosch have done it again with the Greenstar 4000 – released in May 2021.
If you’re wondering how this new boiler is different from their popular i series, then read on. The Heating People are here to help!
We’re experts at helping you to choose the perfect boiler for your needs; which will keep you and your family comfortable for years to come; whilst also helping you to save money on your energy bills.
And although we’re Worcester Bosch Accredited Installers; we’re not tied to Worcester (in fact we’re accredited installers of many boiler brands). And we always provide completely impartial, expert advice.
In today’s blog we’re going to run you through some of the key differences between the new Greenstar 4000; and its predecessors. But for tailored advice on your specific needs, call us today to book your free survey.
Who is Worcester Bosch?
We reckon that even if you’re not familiar with their boilers; you’ll have at least heard of the manufacturer, Worcester Bosch.
Which? Has helped them to become a household name by awarding them the highest brand score for nine years running.
In the Which? Best Boiler Brands Report in 2020, Which? Said:
‘Worcester Bosch performs so consistently well in our annual reliability surveys that its name is synonymous with dependability.’ Quite the accolade.
And it’s not just Which? Who rates them. YouGov have ranked Worcester Bosch as the UK’s best value boiler brand; the most recommended boiler brand; and the best quality boiler brand.
Worcester was originally founded in 1962 and became part of the Worldwide Bosch Group in 1996.
They’ve built up a solid reputation for quality over the last 50 years; boasting a large product range offering reliability and fantastic warranties.
Worcester Bosch doesn’t just produce gas and oil boilers. Their product range also includes hot water cylinders, and renewable technologies such as heat pumps; hydrogen ready boilers; and solar water heating systems, as well as controls and accessories.
Introducing the new Worcester Bosch Greenstar 4000
New for 2021, the Greenstar 4000 is the new and improved successor to the hugely popular Greenstar i.
Worcester describe the Greenstar 4000 as being ‘instantly familiar and yet totally transformed’.
Because it features many of the much-loved features of the i series; whilst boasting improvements in speed and ease of installation; commissioning and servicing; alongside improvements in efficiency and control.
And the good news? Worcester have priced it the same as its predecessor.
Key features of the Worcester Bosch Greenstar 4000
Available in combi and system boilers with a range of power outputs to suit your home and lifestyle.
The Greenstar 4000 is available in 25 kw and 30kw combi boilers (as with the old i series).
You can also opt for a system boiler in 12kW, 15kW, 18kW, 21kW and 24kW outputs.
But don’t worry about choosing the correct type or size of boiler; The Heating People will match you with your perfect boiler after completing a heat loss calculation for your home.
You might like our related blogs: Pros and cons of combi boilers and Pros and cons of system boilers.
The Worcester Bosch Greenstar 4000 is energy efficient
The Worcester Bosch Greenstar 4000 is A-rated for energy efficiency, with an impressive 94% efficiency.
And by adding a Bosch EasyControl internet-connected Smart controller; you can further boost your heating system efficiency to an impressive 98% (also known as A+).
But why should you care about energy efficiency?
Well, boilers are rated on a scale of A to G. With A (like the Greenstar 4000) being the most energy efficient.
The more energy efficient they are; the less wear and tear there is on their component parts, and the less gas they consume.
If your current boiler is at the lower end of the scale; then your boiler could be wasting more than 30p in every £1 that you spend on fuel. So the savings can be big!
Not only that, it’s also a great way to reduce your carbon footprint. Because boilers account for 60% of the carbon dioxide emissions in a gas heated home.
The Greenstar 4000 has a 1:10 modulation range that reduces gas consumption; energy bills; and wear and tear on components.
The 25 and 30kW combi can modulate down to 3kW and the 12kW system to just 1.9kW!
So, as well as being environmentally friendly; this can save you a lot of money on your energy bills – What’s not to like?!
The Worcester Bosch Greenstar 4000 features SimpleSwitch technology
Worcester Bosch have designed their new Greenstar 4000 to be a ‘SimpleSwitch’ for customers who have an existing Greenstar i; i Junior; or Si boiler (2005-2015 models).
This is an advantage because it makes for easier and faster installation. Since the fixing points, pipe centres, and wall-frame are designed to require minimum re-work.
But if you don’t have an older Worcester Bosch model; don’t worry – you’ll still be able to have the Greenstar 4000 installed.
SimpleSwitch just means that the new Greenstar 4000 physically fits within the i footprint of its earlier boiler ranges; making replacements more straightforward.
The Worcester Bosch Greenstar 4000 comes with a hefty guarantee
Worcester Bosch provides hefty 10-year warranties. So that you can have peace of mind that should anything go wrong, you’ll be covered.
However, this is only when the boiler is installed by a Worcester Accredited Installer, such as The Heating People.
You’ll also need to have your boiler serviced annually by a Gas Safe engineer to maintain your guarantee.
The Worcester Bosch Greenstar 4000 is stylish
The Greenstar 4000 is Worcester Bosch’s mid-range boiler, sitting between the 2000 and 8000 boilers.
What you can’t fail to notice about the 4000; is that it’s very similar in appearance to the sleek Worcester Bosch Greenstar 8000 LifeStyle boiler. But is significantly cheaper.
With its curved edges, and LCD digital display; it’s a more modern look compared to the traditional white box in the corner.
Another bonus is that with both the front and right-hand side panels being removable; it’s easy to access the internal components of the boiler for maintenance and servicing.
The Worcester Bosch Greenstar 4000 has a pioneering control display
The user-friendly LCD display provides you with complete control of the boiler and heating system; with easy to use push control buttons.
It also features wireless technology; allowing you to connect with the Bosch EasyControl to control your boiler remotely from your smartphone.
The Worcester Bosch Greenstar 4000 has hot water flow rates up to 12.3 l/min.
The Greenstar 4000 can produce up to 12.3 litres of hot water out of your tap in a minute. And operates extremely well in low water pressure areas, ensuring powerful and warm showers.
With full flow rates from just 1 bar of pressure; they are a great choice if you live in a high rise building or area with low mains pressure.
The Worcester Bosch Greenstar 4000 has intelligent auto-filling
If you’ve been irritated by problems caused by high or low boiler pressure in the past; you might be pleased to learn that the Greenstar 4000 has an ‘intelligent filling system.’
This automatically monitors and adjusts system pressure; reducing the need for you to have to top up, or reduce your boiler pressure.
The Worcester Bosch Greenstar 4000 has frost-protection
The Worcester Greenstar range has built-in frost protection.
This means that the boiler will turn on when the internal temperature drops below 8°C, and will fire up at 5°C. This will raise the temperature of the boiler up to 12°C – thereby preventing the risk of freezing.
The Greenstar 4000 also has a large 500 ml condensate siphon to reduce the risk of freezing in cold weather.
The Worcester Bosch Greenstar 4000 has quieter operation
If you like your peace and quiet, the Greenstar 4000 may just be for you. It’s one of the quietest combi boilers available, making it easy to live with.
The 4000 is 10% quieter than the Greenstar i, which has been awarded the Quiet Mark.
How does the the Worcester Bosch Greenstar 4000 compare to the i series?
But what we really want to know is, how the Greenstar 4000 compares to its predecessor, the best-selling Greenstar i.
Prior to the introduction of the Greenstar 4000, Worcester’s most popular combi boiler was the Greenstar i. The Greenstar i is no longer in production, but there are still some in the supply chain.
The Greenstar i was a very popular boiler because it suited small to medium sized homes with one bathroom; and the controls were straightforward.
The 4000 is an improvement on the i in terms of the speed and ease of installation; commissioning and servicing; alongside improvements in efficiency and control.
The main differences are the new and improved sleeker look, and the compact size.
The combi boiler options also offer a higher flow rate of 10.2 and 12.3 litres a minute; which is good news for your showers.
You might like our related blog: Worcester Bosch Greenstar 4000 versus Greenstar i.
Final thoughts…
We hope you’ve found this blog helpful.
For a free, fixed price quotation, call The Heating People today to book your survey.
Useful Links:
Which? reviews of Worcester Bosch
Worcester Bosch website: Greenstar 4000
If you’re 
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We’ve dedicated an entire blog to the Greenstar 8000 LifeStyle range, which you can read 
The second offering in the Lifestyle range, is the Greenstar 8000 Style, and it’s the premium offering from Worcester Bosch.
Many of the Worcester Bosch combi boilers which we’ve talked about above, are also available as 
The popular Greenstar 4000 is available as a system boiler in 12kW, 15kW, 18kW, 21kW and 24kW outputs.
The Worcester Bosch Greenstar 8000 Life and Style boilers are available as system boilers in 30 and 35 kW power outputs.
A heat-only boiler is also known as a regular or conventional boiler. They are seen as being the traditional way of heating a home. They are usually installed as part of an unvented system, but they can be sealed too.
If you liked the look of the Worcester Bosch Greenstar 8000 Life combi boiler, but you need a heat-only boiler, you’re in luck!
Another good option in the heat-only range is the Worcester Bosch Greenstar Ri.
If you’re confused about what type of boiler you need, you should start by thinking about your heating and hot water needs.
If you’ve read our related blog: 
The Worcester Bosch Group has built up a solid reputation for quality over the last 50 years.
All Worcester Bosch boilers are ErP (Energy-related Products) A-rated.
You can’t buy Worcester Bosch boilers directly from Worcester Bosch. Instead, you need to have one supplied through a Worcester Accredited Installer, such as The Heating People.
Prior to the introduction of the Greenstar 4000, Worcester’s most popular combi boiler was the Greenstar i. The Greenstar i is no longer in production, but there are still some in the supply chain.
If you’re thinking of upgrading your old Greenstar 30i to theWorcester Bosch Greenstar 4000; the latest SimpleSwitch feature means that replacement is even easier.
If you liked the old Greenstar i; you’ll definitely like the new Greenstar 4000, which is following in the footsteps of its best-selling predecessor.
If you’re looking for a
Up until recently, boilers have been thought of as ugly white boxes that are hidden away out of sight. But Worcester Bosch has turned that on its head!
The Life features an improved display screen compared to the CDi Classic, having push control buttons. But the Style goes a step further and boasts a sleek full colour touch screen display. 
Both Lifestyle boilers are available in outputs of up to 50kW for combi boilers. This makes them the most powerful wall hung boilers on the market.
The 50kW Style has the highest water flow rate of any wall-hung combi boiler on the market. It has a hot water tap flow rate of 20.3 litres per minute at 35 degrees. Or 17.9 litres per minute at 40 degrees.
Both Lifestyle boilers are Smart compatible. They can be connected to a range of different Smart thermostats; including the Bosch EasyControl; and other 
If you’ve been perusing Worcester Bosch’s website, you might have come across the similar looking Greenstar 4000. And if so, you’re probably wondering how it differs from the Greenstar 8000.
We hope you’ve found this article helpful. You might like our related blogs: 
You don’t need to worry about whether Worcester Bosch will have a boiler to meet your needs, because whatever your requirements, they’ve been catered for!
Worcester Bosch boilers are well known for their outstanding efficiency.
The Greenstar 2000 is a combi boiler, meaning that it provides all your heating and hot water from the same compact unit, with no need for external tanks or cylinders. This can be an advantage if you’re short on space.
The Greenstar 2000 is a fantastic entry-level boiler which still offers a lot of the aesthetics and performance of their mid-range and premium range boilers.