Three big hitting boilers, from the UK's biggest hitting brand - but, which is the right one for you? Here we'll dive in to the differences between the 2000, 4000 & 8000 boilers from Worcester Bosch.
Founded in 1962, Worcester Bosch remains one of the UK’s best selling boiler brands, offering an award winning range of combi, system and regular boilers.
Among both customers and installers, the brand has maintained a solid reputation holding the Which? Best Buy Award for over 10 years and acquiring thousands of 5 star reviews on Trustpilot.
Pushed for time? Here's your (very) speedy overview:
2000 - The best way to tap into Worcester (on a budget) and be reassured by their product guarantee and aftercare. However, if your budget stretches, buy the 4000.
4000 - An outstanding allrounder, the 'everyday' boiler and our recommendation. Reason not to buy? You're chasing top efficiency for a big house, with a bigger budget (buy the 8000).
8000 - Range topping tech in a physically bigger boiler. Buy this with no budget constraints for your larger home and get top class efficiency from the most premium of gas boilers.
The Greenstar range is the brand's most popular range of boilers, offering a selection of modern, high-efficiency and award winning models suitable for homes with a variety of different hot water demands.
The Greenstar range was recently upgraded and has been developed with feedback from installers and customers, offering industry leading performance including super fast installation and servicing.
Worcester Bosch have been Which? Best Buy boilers for 10 years on the trot
Three of the brand's latest models within this range include the Worcester Bosch Greenstar 2000, 4000 (replacing the i) and the 8000 (replacing the CDi Classic.)
But, how do they compare? And which is most suitable for your home?
Let’s take a thoroughly deep dive into the details…
Super-quick 2000, 4000 & 8000 comparison
2000 | 4000 | 8000 | |
Outputs (kW) | 25kW | 25kW | 30kW |
Dimensions | 700mm H | 710mm H | 780mm H |
Efficiency | 93% - A | 94% - A | 94% - A |
Guarantee | up-to 6 Years | up-to 10 Years | up-to 10 Years |
Cupboard Fit | Yes | No | No |
Price (Fitted) | From £2,045 | From £2,265 | From £2,845 |
|
*prices based on a combi boiler replacement, like-for-like swap (correct as of 11 Sept, 23)
Worcester Bosch Greenstar 2000 (Entry Level Model)
The Greenstar 2000 is the brand's latest entry-level combi boiler model offering a sleek, contemporary exterior combined with an efficient, powerful and reliable interior.
It is ideal for those on a budget who want to secure an industry leading boiler for their home at a very competitive price. It also includes an impressive 6-year guarantee for parts and labour (when purchased via Heatable).
The 2000 range is available in the following sizes (power outputs):
25kW
30kW
These power outputs, combined with it’s compact design make it suitable for small properties with one bathroom. It’s also recognized as the brand's quietest combi boiler, making it even more appealing for small properties where it’s not always easy to install it far away from the bedroom.
In terms of design, the 2000’s exterior case is far superior to rivals, providing a modern aesthetic with silver edge detailing and a sleek looking digital interface.
You can read the full Worcester Bosch 2000 review, here.
Main features of the Worcester Bosch Greenstar 2000
Here are some of the most noteworthy features of the Worcester Bosch 2000 model:
Worcester Bosch’s quietest combi boiler model
Designed to fit in small spaces i.e. kitchen cupboards
Easy access with removable side panels
6-year parts and labour guarantee on boiler
10-year guarantee on the primary heat exchanger
ErP rating 93%: A-rated
Dimensions: 700mm x 300mm x 400mm
Worcester Bosch 2000 Key Points:
Entry level combi boiler
Suitable for small to medium sized properties with one bathroom
Officially the brands quietest combi boiler
Sleek, contemporary design with digital interface
6 year guarantee on labour and parts when purchased via Heatable
Compact design makes it suitable for kitchen cupboard installation
Who is the Greenstar 2000 suitable for?
The 2000 offers the same modern exterior as the 4000 and the 8000, so if you want a boiler with a more refined aesthetic, the 2000 is a good choice.
With a 25kW or a 30kW model within the range, the boiler is ideal for those that live in small property, including an apartment or one bathroom home.
It’s also considerably more compact than it’s other big brothers - the 4000 and 8000, meaning that it’s ideal for properties with limited space.
In summary, the Worcester Bosch 2000 is the latest ‘entry-level’ combi boiler, as well as their quietest, boasting A-rating efficiency, a user-friendly digital display and a reassuring Which? Best Buy Award.
Want to know how these boilers compare, check out our 2000 vs 4000 vs 8000.
Who may the 2000 not be suitable for?
If you live in a property with more than one bathroom, or a high hot water demand, the Greenstar 2000 may not be suitable, as it will likely struggle to keep up with your hot water demands.
In addition, if you are looking for a boiler with the latest innovative features the 2000 is not going to be the best choice.
Compared to its big brothers, including the mid-range 4000 and premium 8000, the model does not include wireless control and does not come with a 10-year guarantee.
Worcester Bosch Greenstar 4000 (Mid-Range Model)
The Greenstar 4000 recently replaced the brands best selling combi boiler - the Greenstar i.
Designed to sit between the entry-level 2000 and premium 8000 model, the 4000 is the brand’s mid-range offering.
Just like the 2000, the 4000 is available in two power outputs, the 25kW and slightly larger 30kW, making it ideal for small to medium sized properties.
The Greenstar 4000 system boiler is a completely different type of boiler, ideal for larger properties with multiple bathrooms and greater hot water demands.
The system version is available as a wall-hung unit in either black or white and requires a separate hot water storage cylinder.
You can check what type of boiler is suitable for your home using our quick free tool and you can read the full in-depth Greenstar 4000 review here.
In terms of design, the Greenstar 4000 offers the same modern exterior as it’s siblings including curved edges and a stunning digital display.
How is the Greenstar 4000 better than the 2000?
Not only does it come with a 10 year guarantee (when purchased via Heatable), it also includes a range of innovative features not included with the 2000.
This includes the ‘Quick Tap’ water saving function that helps to reduce water waste, as well as wireless functionality, meaning it can be controlled remotely using the Bosch EasyControl or other market leading smart thermostats such as the Google Nest or tado smart home kit.
...full text display allowing rapid diagnosis, fault-finding and commissioning
The digital interface also offers a full colour text display and is compatible with Worcester’s intelligent filling system.
This interface provides full text display allowing rapid diagnosis, fault-finding and commissioning, meaning you can avoid the need of searching through manuals and having to find fault codes.
This system uses software that is able to maintain your boiler’s pressure at its optimum level. If the pressure drops, the internal filling valve will be triggered, automatically refilling the system and turning back off once the task is complete.
It will also alert you if the boiler is losing too much pressure, allowing you to avoid unnecessary engineer callouts.
Worcester Bosch 4000 Key Points:
Mid range combi boiler replacing the best selling Greenstar i
Suitable for small to medium sized properties with one bathroom
Available as a system boiler for properties with a higher hot water demand
Sleek, contemporary design with digital interface
10 year guarantee on labour and parts and the heat exchanger when purchased via Heatable
Main features of the Worcester Bosch 4000 Boiler
Worcester Bosch’s mid-range model
Designed to have a quieter operation than the Greenstar i
Compatible with all Worcester Bosch controls and third party controllers such as Hive, Nest, tado etc.
Ideal for small and medium sized homes
Quick Tap water saving function
Easy access with removable side panels
Solar compatible Greenstore cylinders
10-year guarantee on parts and labour (when purchased via Heatable)
ErP rating 94%: A-rated
Dimensions: 710 x 400 x 310
Who is the Greenstar 4000 suitable for?
The Greenstar 4000 is ideal for those that live in small to medium sized properties that want to take advantage of a market leading 10 year guarantee and some of the brand's latest and most popular features.
Also offered as a system boiler, this option enables you to take advantage of all of the same design perks and features and install a boiler that will be more suitable for those that live in a larger property with higher hot water demands.
A fantastic mid-range boiler, looking to fill the boots of the award-winning, ever popular Greenstar i
In conclusion, the Worcester Bosch Greenstar 4000 is the latest ‘mid-range’ offering, boasting an A-rating for efficiency, a range of innovative features, a user-friendly full colour digital display and a reassuring Which? Best Buy Award.
Who may this model not be suitable for?
The Greenstar 4000 is suitable for the majority of households in the UK and since it’s available as a system boiler, it is also suitable for homes with a high demand for hot water i.e. homes with more than one bathroom.
However, if you want to take advantage of Worcester’s latest and greatest features, or require a boiler that’s extra powerful, the Greenstar 8000 is going to be your ideal choice.
See below...
Worcester Bosch Greenstar 8000 (Premium Model)
The Greenstar 8000 (Life, Style) is Worcester Bosch’s latest premium boiler option and officially their most powerful wall hung unit. It also benefits from a very generous 10 year guarantee (when purchased via Heatable).
It is the ideal choice if you have a larger home with a high hot water demand i.e. a home with multiple bathrooms and/or you want to make use of the brand's latest and greatest innovations.
Similar to the 4000, it’s also available as a system boiler, providing an appropriate option for properties with a larger hot water demand.
Just like it’s siblings, the Greenstar 8000 Style has a modern exterior, featuring a sleek silver edge detail and offered in either black or white.
The 8000 range is available in the following sizes (power outputs):
30kW
35kW
40kW
45kW
These power outputs make it ideal for larger properties with a high hot water demand, as although the heating output is largely the same throughout the 8000 range, the difference comes with the hot water output.
Therefore, if you have good cold water flow rate and multiple bathrooms, this boiler will meet your demands quite well.
Have a whopping great house with a shed load of bathrooms? Get the 8000, you deserve it.
Just like the 4000, it also features an upgraded touchscreen digital interface and easy push control buttons making usability easier than ever.
This interface provides full-text display allowing rapid diagnosis, fault-finding and commissioning, meaning you can avoid the need of searching through manuals and having to find fault codes.
It also includes Eco mode, allowing you to save even more energy and money by linking it to the Bosch Easycontrol, or other popular smart thermostats including Hive and Nest.
This enables you to save even more money on your heating bills, by having greater control over when and how your boiler operates.
Like the 4000, it is also compatible with Worcester Bosch most popular features, such as the intelligent filling system.
You can read the full Worcester Bosch 8000 review here.
How is the Greenstar 8000 better than the 4000?
The Greenstar 8000 is essentially an upgrade of the CDi Classic and is the brand's most powerful range, offered in power outputs from 30kW all the way up to 45kW.
This means it is able to handle far greater hot water demands than the 4000, making it suitable for larger homes with multiple bathrooms.
Like its predecessor, the pipework for the 8000 can be installed behind the boiler thanks to the steel mounting jig, meaning that the boiler can be piped up before being fitted onto the wall, for a neater look.
Worcester Bosch 8000 Key Points:
Premium boiler replacing the best selling Greenstar CDi Classic
Suitable for medium to larger sized properties with multiple bathrooms
Available as a system boiler for properties with a higher hot water demand
Sleek, contemporary design with a digital interface
10 year guarantee on labour and parts and the heat exchanger when purchased via Heatable
Main features of the Worcester Bosch 8000 Boiler
Here are some of the standout features of the Worcester Bosch Greenstar 8000 Life model:
Worcester Bosch’s most powerful wall hung combi boiler range
Ideal for larger homes with more than one bathroom
Easy access with removable side panels
10-year guarantee on parts and labour
Pipework hidden behind the boiler
Solar compatible Greenstore cylinders.
ErP rating 94%: A-rated
Dimensions: 780mm x 365mm x 440mm
Who is the Greenstar 8000 suitable for?
The Greenstar 8000 is ideal for those looking for a super powerful boiler that live in a larger home with multiple bathrooms and/or a large hot water demand, as well as those that want to benefit from an industry leading 10 year guarantee.
The 8000 range also benefits from the same streamlined exterior as the 2000 and 4000 and a full colour digital display, as well as the latest and greatest features offered by the brand.
You also have the option of the 8000 system boiler, if you do have a property with significant hot water demands.
In conclusion, the Worcester Bosch Greenstar 8000 is the latest ‘premium’ option from the manufacturer, including the signature A-rating for efficiency, the latest innovative features, a user-friendly full colour digital display and a reassuring Which? Best Buy Award.
Who is the Greenstar 8000 not suitable for?
If you have limited space and are looking for a compact boiler to fit in a small place such as a kitchen cupboard, the 8000 will probably be too large.
Or, if you're on a budget.
Alternatively, we recommend the Greenstar CDi Compact, which has been designed precisely for that purpose.
Worcester Bosch 2000 vs 4000 vs 8000: Verdict
No matter which you choose, the latest Greenstar range is super stylish, super sleek, super efficient and offers a big improvement on the boilers of yesteryear.
With that said, if you live in a small to medium sized property and are looking for a budget-friendly combi boiler from an industry leading brand, then the Greenstar 2000 is an excellent option.
If you are looking to secure a mid-range boiler with a 10 year guarantee, as well as some major features, such as wireless connectivity and a user-friendly touchscreen interface, the Worcester Bosch Greenstar 4000 is going to be the one for you.
If you are looking for a premium boiler with all of the latest and greatest features, as well as a 10 year guarantee and enough power for multiple bathrooms, then the Worcester Bosch 8000 is probably going to be the boiler for you.
If you’re still confused about the right boiler for your home, whether that be size or budget, use our free tool that will help you choose the best boiler for your property.
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