Which Worcester Bosch boiler is best for my home?
It wouldn’t surprise us if you landed here because you’ve heard a lot of amazing reviews about Worcester Bosch boilers, but you’re just not sure which Worcester boiler model or boiler type is best suited to your home and needs. The best place to start is by getting an understanding of what a combi, system, or regular boiler is and how they work, which we have covered in-depth in other blogs. However, here’s a quick breakdown for you:
- Combi boilers don’t have any tanks, they heat water from the mains water supply. Combi boilers tend to be the best option for most UK homes as they don’t require storage tanks and offer heating and hot water on demand.
- System boilers have a hot water storage tank, usually in an airing cupboard. System boilers are usually found in households with more than one bathroom in use at the same time (high hot water demand).
- Regular boilers have a hot water tank and a cold water storage tank (usually in the attic). Regular boilers are useful for homes with low water pressure as they utilise a ‘gravity fed’ system but due to the tanks involved, most homes switch to a combi boiler when replacing a regular boiler.
Now that we’ve done our homework and figured out which Worcester Bosch boiler type we need, now we can look at which Worcester Bosch boiler model would be best suited to your home.
It’s worth mentioning here that if you take the WarmZilla survey, we’ll automatically recommend the most suitable boilers for you by asking a few simple questions about your home. You don’t need to worry about what kW boiler you need as we’ll suggest the right boilers for your home.
Although, if you wanted to compare your current heating system to other boiler brands and models, you could use our Boiler Comparison tool. This tool allows you to compare up to three boilers models or brands at one time, to help you find the perfect new boiler for your home.
Before we get into the nitty-gritty of which Worcester Bosch boiler is best for your home, here’s a little bit about Worcester Bosch’s brand history.
Worcester Bosch History
Worcester was formed in 1962 in Worcester, where it imaginatively took its name. It started off as a small engineering work before growing into the biggest boiler manufacturer in the UK. It was acquired by Robert Bosch Holdings in 1992 to form the Worcester Bosch Group.
Worcester currently holds the Royal Warrant to supply heating to the Royal Family and has won the Which? Best Buy award for their range of boilers for the last ten years. This prestigious award is judged on reliability, build quality, recommendation, and customer score.
Worcester Bosch Reviews
Which? Best Boiler Brand Survey Results
During the Which? Best Boiler Brand Survey 2021, Worcester Bosch was awarded an overall score of 84%, ranking first place out of the 16 boiler brands that scored within the survey helps to generate Worcester Bosch’s customer and reliability scores.
153 Which? Trusted Traders are also asked to score Worcester Bosch boilers on ease of fixing, the availability of spares and parts and brand quality.
Worcester Bosch was given 5 stars out of 5 for reliability and brand customer score, and 4 stars out of 5 for their overall brand engineer score.
Worcester Bosch has over 27k reviews on Trustpilot and 4.6 stars out of 5. We can see from these ratings that we are dealing with a company that cares a lot about its customers and the quality of its products.
Worcester Bosch Trustpilot Reviews
Let’s have a look at what some of Worcester Bosch’s customers have had to say regarding their Worcester Bosch boiler.
“Very happy with our Worcester Bosch Boiler. The house warms up quickly and we always have piping hot water. No hesitation in recommending”.
“Very efficient boiler. Came with a 10 year warranty. Obviously must be serviced every year but we would do that anyway. Fast hot water. One of the best on the market”.
“My boiler is wonderful. I have constant hot water. I can shower when ever I like. And my home is perfect for me as it is always toastie warm when I get up, comfortable during the day when I need a little heat, and cooler at night when I go to bed”.
Which Worcester Bosch Combi Gas Boiler is best for my home?
Worcester Bosch Greenstar 2000 Combi Gas Boiler
The Worcester Bosch Greenstar 2000 combi gas boiler is available in two kW outputs of 25kW and 30kW. The Worcester Bosch Greenstar 2000 25kW is also named one of the quietest combi gas boilers on the market, at 45dB.
With an efficiency rating of 93%, the Greenstar 2000 is a highly reliable combi boiler that can help to reduce your current energy bills.
This combi boiler range is perfect for medium to larger-sized homes with up to 20 radiators and 1-2 bathrooms.
Worcester Bosch Greenstar 2000 Combi Gas Boiler Features
- Bosch engineered quality at an affordable price
- The perfect size for fitting between your wall-mounted kitchen cupboards
- Incredibly quiet when in use, it’s our quietest Worcester Bosch combi boiler
- Features our innovative Quick Tap water-saving feature, which is activated with a quick open and close of a hot water tap. This helps to reduce water wastage in your home
- Perfect for small to medium-sized homes with one bathroom
- Peace of mind with a 10-year guarantee on the primary heat exchanger
Worcester Bosch Greenstar 4000 Combi Gas Boiler

The Worcester Bosch Greenstar 4000 combi gas boiler is available in two kW outputs. These include a 25kW model and a 30kW model.
The new Greenstar 4000 range is Worcester Bosch’s latest edition to the family and will be replacing the Greenstar i combi range. It sits neatly in between the Worcester Bosch 2000 and the Worcester Bosch 8000 Life and Style range.
The Worcester Bosch Greenstar 4000 is one of the most efficient combi boilers on the market, with an efficiency of 94% and an ErP A-rating.
Worcester Bosch Greenstar 4000 Combi Gas Boiler Features
- Perfect for small to medium-sized homes with one bathroom
- One of the quietest combi boilers available, making it easy to live with
- A wide power range helps to reduce gas consumption and lower energy bills
- Innovative ‘Quick Tap’ water-saving function helps you reduce water waste
- The modern new design comes with an easy to use colour display
- Operates extremely well in low water pressure areas, ensuring powerful and warm showers
- One of the quietest combi boilers available, making it easy to live with
- Features wireless connectivity with the Bosch EasyControl
- Instantaneous hot water, always available
Worcester Bosch Greenstar 8000 Style Combi Gas Boiler

The Worcester Bosch Greenstar 8000 Style combi gas boiler is available in five different kW sizes, including the 30kW, 35kW, 40kW, 45kW and 50kW size models.
With such a wide range of kW size options, this combi boiler is ideal for medium to larger homes with up to 20 radiators and 2+ bathrooms.
This combi boiler range comes in two colour options, a black or white high-gloss finish, perfect for homes that have more modern decor.
Worcester Bosch Greenstar 8000 Style Combi Gas Boiler Features
- Available with our longest ever guarantee
- Optional unique Intelligent Filling System
- Wireless connectivity with our smart thermostat, the Bosch EasyControl
- Easy-to-use full-colour boiler display
- One of our quietest boilers to date
- Stunning design-led boiler available in a high gloss black or white
- Part of our most powerful wall-hung boiler range, effortlessly heating larger homes
- Our most connected and intelligent boiler, with wireless connectivity to the Bosch EasyControl
Worcester Bosch Greenstar 8000 Life Combi Gas Boiler
The Worcester Bosch Greenstar 8000 Life combi gas boiler is available in a 30kW, 35kW, 40kW, 45kW and a 50kW size model, meaning that there is a boiler size for all property sizes.
Similar to the Worcester Bosch Greenstar 8000 Style combi boiler, the 8000 Life also has a wide range of kW size options, suitable for medium to larger homes with a higher demand for central heating and hot water.
With an efficiency rating of 94%, this combi boiler is sure to help reduce your energy bills, depending on your current boiler.
Worcester Bosch Greenstar 8000 Life Combi Gas Boiler Features
- Available with our longest ever guarantee
- Modern new design
- Improved boiler display screen with easy to push control buttons
- Optional unique Intelligent Filling System
- Ideal for larger homes with more than one bathroom
- Wirelessly connectivity with our smart thermostat, the Bosch EasyControl
- The ability to run on a 20% hydrogen blend
- Part of our most powerful wall-hung boiler range, suitable for larger homes
Worcester Bosch Greenstar CDi Compact Combi Gas Boiler

The Worcester Bosch Greenstar CDi compact combi gas boiler range is available in a 28kW model, a 32kW model and a 36kW model.
The Greenstar CDi Compact is Worcester Bosch’s smallest combi boiler, measuring only (H): 690mm x (W): 390mm x (D): 280mm.
The Worcester Bosch CDi range also comes with a standard manufacturing warranty of 10 years, so you don’t need to worry about being without central heating and hot water. However, it is important to ensure that your boiler is annually serviced to ensure that your warranty remains valid.
Worcester Bosch Greenstar CDi Compact Combi Gas Boiler Features
- Fits in a standard kitchen cupboard
- User-friendly displays for ease of use
- Hot water can be adjusted to fine tune your comfort
- Simple boiler control knobs with clear temperature display
- Frost protection is included, reducing frost risk if installed in a garage or a loft
- Wide choice of controls enables greater comfort and economy
- Low energy pump reduces electrical usage
- Instantaneous hot water, always available
- Achieves an A+ ErP package efficiency rating for heating when installed with a smart internet-connected Bosch EasyControl
Worcester Bosch Greenstar Highflow CDi Combi Gas Boiler
The Worcester Bosch Greenstar CDi combi range is also available in a 29kW and a 41kW.
With an efficiency rating of 92% and an ErP A-rating for central heating, the Worcester Bosch Greenstar Highflow CDi combi boiler is a high-efficiency floor-standing boiler that could potentially help you to not only lower your energy bills but also reduce your carbon footprint.
It is important to note before purchasing a new or replacement Highflow CDi combi boiler, that this boiler is a floor-standing boiler that is larger in size than your standard combi boiler, as a result of this, this boiler will not fit inside a standard kitchen cupboard.
Worcester Bosch Greenstar Highflow CDi Combi Gas Boiler Features
- Fits underneath a standard kitchen worktop
- Larger homes can be supplied by higher output options
- Wide choice of controls enables greater comfort economy
- Frost protection is included, reducing frost risk if installed in a garage or a cellar
- Simple boiler control knobs with temperature display
- Instantaneous hot water, always available
- Provide high hot water flow rate over 90-litre draw-off
- The ability to run on a 20% hydrogen blend
Which Worcester Bosch System Gas Boiler is best for my home?
Worcester Bosch Greenstar 4000 System Gas Boiler
The Worcester Bosch Greenstar 4000 system gas boiler is available in a 12kW, 15kW, 18kW, 21kW and 24kW size boiler model.
The Greenstar 4000 is Worcester Bosch’s latest boiler model. If you want to know more information about the Worcester Bosch Greenstar 4000, we have a separate blog on this.
Worcester Bosch Greenstar 4000 System Gas Boiler Features
- A wide power range helps to reduce gas consumption and lower energy bills
- The modern new design comes with an easy to use colour display
- Our quietest system boiler, making it easy to live with
- Features wireless connectivity with the Bosch EasyControl
- Suitable for homes where the heating system includes a hot water storage cylinder
- Can be used with Greenskies solar panels for energy and cost savings
- The ability to run on a 20% hydrogen blend
Worcester Bosch Greenstar 8000 Style System Gas Boiler
The Worcester Bosch Greenstar 8000 Style system boiler is available as a 30kW and 35kW model.
It is important to remember that when purchasing a new or replacement system boiler, you will need the additional space in your home for the hot water cylinder tanks. This is typically installed inside an airing cupboard or a similar-sized space in your home.
As mentioned, the Worcester Bosch Greenstar Style range is available in two high-gloss colours, black and white, so you have a choice of model to fit perfectly with your home.
Worcester Bosch Greenstar 8000 Style System Gas Boiler Features
- Available with our longest ever guarantee
- Wireless connectivity with our smart thermostat, the Bosch EasyControl
- Available in either black or white to suit your home
- Ideal for larger homes with more than one bathroom
- Easy-to-use full colour boiler display
- One of our quietest boilers to date
- The ability to run on a 20% hydrogen blend
Worcester Bosch Greenstar 8000 Life System Gas Boiler
The Worcester Bosch Greenstar 8000 Life system gas boiler is available as a 30kW and 35kW boiler model.
The 8000 Life System gas boiler has been designed to be compact and lightweight, for easy installation into a standard kitchen cupboard.
However, it is important to note that you will need an additional hot water storage cylinder installed with a system boiler. Hot water cylinders are usually installed in an airing cupboard or a similar size space in your home. Therefore, if space is limited, then a combi boiler may be a better option.
Worcester Bosch Greenstar 8000 Life System Gas Boiler Features
- Available with our longest ever guarantee
- Modern new design
- Improved boiler display screen with easy to push control buttons
- Wirelessly connectivity with our smart thermostat, the Bosch EasyControl
- Ideal for larger homes with more than one bathroom
- The ability to run on a 20% hydrogen blend
Worcester Bosch Greenstar i System Gas Boiler
The Worcester Bosch Greenstar i system gas boiler has a wide range of boiler models, suitable for all property sizes. This range includes a 9kW, 12kW, 15kW, 18kW, 21kW, 24kW, 27kW and 30kW boiler model. The Greenstar i System boiler range has an efficiency rating between 92% and 94%, making it an A-Rated boiler range.
With a standard manufacturing warranty of 7 years, you have extra peace of mind during the colder winter months. It is important to get your Worcester Bosch boiler annually serviced to ensure that your warranty remains valid.
Worcester Bosch Greenstar i System Gas Boiler Features
- Simple boiler controls with clear information display
- Suitable for homes where the heating system includes a hot water storage cylinder
- Choice of controls enables greater comfort and economy
- Can be used with Greenskies solar panels for energy and cost savings
- Low energy pump reduces electrical usage
- Large Condensesure style siphon built into the boiler to help reduce frost risk
- Fits in a standard kitchen cupboard
- Simple boiler control knobs with clear temperature display
- User-friendly displays for ease of use
Which Worcester Bosch Regular Gas Boiler is best for my home?
Worcester Bosch Greenstar 8000 Life Regular Gas Boiler
The Worcester Bosch Greenstar 8000 Life regular gas boiler is available as a 30kW, 40kW, 45kW and a 50kW model.
It is important to note that when purchasing a new or replacement regular boiler, you will need to have additional space for a hot water cylinder (typically installed in an airing cupboard of a home), and a cold water tank and feed, which are installed in the attic. For this reason, regular boilers are not recommended for homes with limited space.
Worcester Bosch Greenstar 8000 Life Regular Gas Boiler Features
- Available with our longest ever guarantee
- Modern new design
- Improved boiler display screen with easy-to-push control buttons
- Wirelessly connectivity with our smart thermostat, the Bosch EasyControl
- Ideal for larger homes with more than one bathroom
Worcester Bosch Greenstar Ri Regular Gas Boiler
The Worcester Bosch Greenstar Ri gas boiler is available in a wide range of kW options, suitable for all property sizes. This range includes a 12kW model, a 15kW, 18kW, 21kW, 24kW, 27kW and a 30kW boiler model.
The Worcester Bosch Greenstar Ri Regular Gas Boiler range is a compact, lightweight boiler that can fit easily inside a standard kitchen cupboard.
With an efficiency rating of 92% and an 8-year standard warranty, you can sit back and enjoy a warm home with this Greenstar Ri regular boiler.
Worcester Bosch Greenstar Ri Regular Gas Boiler Features
- Fits in a standard kitchen cupboard
- Simple boiler control knob
- Suitable for homes where the heating system includes a hot water storage cylinder
- Frost protection is also included, reducing frost risk if installed in a garage or loft
- Can be used with Greenskies solar panels for energy and cost savings
- Best-selling regular boiler that fits within a standard kitchen cupboard
- Choice of controls enables greater comfort and economy
Worcester Bosch Greenstar CDi Regular Gas Boiler
The Worcester Bosch Greenstar CDi regular floor-standing gas boiler is available as a 30kW and a 42kW boiler model.
The Worcester Bosch Greenstar FS CDi regular gas boiler range is a floor standing boiler, ideal for larger homes with higher demand for heating and hot water.
With an efficiency rating of 92% and an ErP A-rating for central heating, this regular boiler could potentially help you to reduce your energy bills.
Worcester Bosch Greenstar CDi Regular Gas Boiler Features
- Fits underneath a standard kitchen worktop
- Stored hot water can be rapidly replenished with high output options
- Simple boiler control knobs with temperature display
- Can be used with Greenskies solar panels for energy and cost savings
- Ultra high performing floor-standing regular boiler
- Perfect replacement for an older floor-standing boiler
Having looked at Worcester Bosch combi, system and regular boilers we can see that they are very reliable, as you would expect from precision German engineering. With this said, all Worcester Bosch boilers are manufactured in the UK, meaning that spares and parts should be easy to get a hold of if needed.
Here at WarmZilla, our mission is to give you all the help and support you’ll need to find the best boiler for your home at the best price, that’s why we’ve written blogs about the best combi boilers, best system boilers and best conventional boilers in 2022. So make sure to check them out!