Worcester Bosch Greenstar 2000 Combi Boiler Cost with Installation

As Worcester Bosch’s entry-level combi boiler, it’s safe to say the Greenstar 2000 offers practicality, high efficiency, quiet operation, and the reassurance of a trusted UK brand. For smaller homes, it offers the reliable performance that Worcester Bosch is known for without the additional cost associated with their more premium models.

See more about the Greenstar 2000’s specifications below:

Worcester Bosch Greenstar 2000 Combi Product Table
	Available outputs	25kW	30kW
	Type	Combi	Combi
	Fuel	Gas	Gas
	Condensing	Yes	Yes
	Efficiency rating (%)	93	94
	ErP	A	A
	LPG compatible	Yes	Yes
	Standard guarantee	5-to-7 years*
	Max output (kW)	25	30
	Flow rate (l/min)	10	12
	Mounting	Wall-mounted
	Dimensions (mm)	724 x 400 x 300
	Typical Price (incl. VAT)	£900	£1,050
	Typical installation cost (incl. VAT)	£800 – £1,300
	Total cost	£1,800 – £2,400

*Terms and conditions apply.

Worcester Bosch Greenstar 2000 combi overview

So, you’re looking for a combi boiler? The Greenstar 2000 combi has many perks for homeowners – it’s well-built and efficient, at a competitive price point. As one of the brands most accessible combi options you can get the dependable heating and hot water, whilst also benefiting from additional features, such as QuickTap and ECO Mode, without the steeper price point of more premium models.

As an all-in-one combi boiler, it delivers central heating and hot water directly from the mains, removing the need for a separate hot water cylinder or storage tank. This makes it particularly suitable for properties where space is limited.

Worcester Bosch Greenstar 2000 Combi Range
Model output size	House size	Bathrooms	Radiators
25kW	Flats, small homes 1 to 3 bedrooms	1	Up to 10
30kW	Small-medium homes 3 to 4 bedrooms	1	Up to 15

With hot water flow rates of around 10-12 litres per minute, the Greenstar 2000 combi is best suited to single-bathroom homes.

So, if you’re working with a property that includes a bath, we recommend the 30kW model to better meet hot water demand, while the 25kW version works well for flats or homes with a single shower and lower everyday usage.

💡 Top Tip: A bigger output isn’t always better. In homes with lower hot water demand it can cause the boiler to run less efficiently and the running costs can be higher in the long run, so make sure to pick the output best suited to your hot water usage!

Key benefits at a glance

• ErP A-rated efficiency for lower energy bills
• Compact size for discrete installation
• Quiet Mark accredited, operating at 47dB (A)  
• Simple LCD control display
• QuickTap water-saving feature for fast hot water
• Compatible with a range of controls
• ECO Mode option, saves energy by only heating up water when the tap is run
• Built-in internal frost protection, activated when the boiler’s internal temperature drops below 8°C
• Ready to run on a 20% hydrogen blend mixed with natural gas
• LPG-compatible
• Up to 7-year guarantee options when purchased via Fast Track service

Worcester Bosch Greenstar 2000 combi technical specifications

Marketed as Worcester Bosch’s quietest combi boiler, it operates at just 47 dB(A), making it well suited to installations in kitchens, utility rooms, and near living spaces where noise levels matter.

The Greenstar 2000 prioritises dependable day-to-day heating and hot water, straightforward controls, and long-term reliability. It combines ErP A-rated efficiency with features such as QuickTap hot water pre-heat and ECO Mode, helping to reduce water and energy waste during everyday use.

Output and efficiency ratings

The Worcester Bosch Greenstar 2000 combi is available in two output sizes – 25kW and 30kW – allowing homeowners to choose a model that best suits their hot water demand and property size.

Operating at 93-94% efficiency, the combi makes for one of the most efficient combi boilers available. Making for minimal fuel wastage, which curbs energy bills and offers a more sustainable option than older models that waste gas. 

In practical terms, this level of efficiency can help reduce fuel consumption and keep energy bills lower – particularly when replacing an older, non-condensing boiler that may operate at just 60-70% efficiency.

The Greenstar 2000 also uses modulating burner technology, allowing it to adjust its output when demand is low. This prevents unnecessary cycling and helps maintain efficiency during everyday use rather than only at peak output.

Dimensions 

Standing at just 724mm tall, and with a 400mm width and 300mm depth, the Greenstar 2000 is perfectly compact for easy cupboard installation. The clean and sleek design offers a nicely stylish look for installation in kitchen and utility areas – with no clunky hardware to ruin your living spaces.

It features in-line gas and hydraulic connections, a pre-wired mains cable, and a cleverly positioned pressure relief valve (PRV) to allow flexible installation and easier pipe routing – all of which can help reduce installation time and complexity.

Components included

This neat little boiler features a tried and tested aluminium-silicone heat exchanger, helping maintain robust heat transfer and long-term reliability. Both output options use a wide modulation range, meaning the boiler can reduce output down to about 3kW when demand is low.

The Worcester Bosch Greenstar 2000 also includes a QuickTap function, which reduces water wastage and shortens the wait for hot water – particularly handy in kitchens and bathrooms where frequent, small demands occur.

With built-in frost protection when the boiler temperature drops below 8°C, the boiler’s internal components are protected during colder weather. This makes it useful for garage installation and in properties that go unoccupied for brief stretches of time.

Controls are designed to be straightforward and homeowner-friendly, with a push-button LCD display. Whilst the boiler doesn’t include built-in Wi-Fi as standard, it is compatible with a wide range of Worcester Bosch thermostats and common third-party controls, including wireless RF and 230V external options.

Prices and installation costs

The Greenstar 2000 combi typically costs £900-£1,050. This includes listings that come with a flue – which is a standard part of boiler installation, with the flue directing harmful gases outside. 

Flues can be horizontal, exiting from an external wall, or vertical, exiting through the roof. Roof flues can be significantly more expensive (at over £550) as installation is tough, whilst wall flues are around £100. The Greenstar 2000 now has an extended flue length of 12m horizontally and vertically – these upgrades improve the flexibility of installation.

Worcester Bosch Greenstar 2000 Combi Costs
Output size	Unit cost (incl. flue)	Total (incl. installation)
25kW	£900	£1,800
30kW	£1,050	£2,250

These prices are based on market research and homeowner data submitted to WhatPrice. To secure an accurate quote for your situation, it’s best to request quotes from Gas Safe registered installers. Using the WhatPrice Boiler Cost Calculator can also provide a tailored guide price.

Warranty and support

The Worcester Bosch Greenstar 2000 combi comes with a 7-year manufacturer guarantee when purchased through its FastTrack service. The exact warranty length can depend on the purchase route, installer, and whether required accessories such as a system filter are included. This guarantee covers parts and labour for manufacturing faults, giving you reassurance in the early years of ownership.

To keep the guarantee valid, the boiler must be installed by a Gas Safe registered engineer and registered with Worcester Bosch shortly after installation (usually within 30 days). You’ll also need to arrange annual servicing by a qualified engineer. The guarantee does not cover general wear, neglect, incorrect installation, or damage caused by debris or sludge in the system.

Worcester Bosch also offers a longer component guarantee on the primary heat exchanger – often up to 10 years – when installed and maintained according to terms and conditions.

Worcester Bosch provides UK-based support and an extensive engineer network to help with aftercare and technical advice throughout the boiler’s lifespan.

Installation information

Installation costs for the Worcester Bosch Greenstar 2000 combi are typically around £1,200, though the final price will depend on factors such as your existing heating system, pipework condition, flue position, and local labour rates.

The Greenstar 2000 is designed with clear internal layout and flexible connections, helping make installation straightforward for experienced engineers –  particularly when replacing an existing combi boiler in the same location.

What to expect on installation day

If additional work is required – such as upgrading pipework or relocating the boiler – your installer should explain this clearly beforehand, including any impact on cost or installation time.

Do you need a system flush or filter?

Under UK Building Regulations, all new boiler installations and replacements must include adequate system cleaning and ongoing water protection. In practice, this requirement is typically met by fitting a magnetic system filter, and your engineer may also recommend carrying out a system flush, depending on the condition of your existing heating system.

A system flush is usually carried out before the new boiler is installed. It uses a specialist cleaning solution to remove sludge, rust, and debris from radiators and pipework. This helps improve heat circulation, ensures radiators warm evenly, and reduces the risk of blockages that could affect boiler performance.

A magnetic system filter is fitted to the heating system to continuously capture metal particles and debris before they can circulate through the boiler. This plays an important role in protecting internal components – particularly the heat exchanger – and supports long-term reliability.

While these measures involve additional upfront cost, they are widely recommended and expected as part of a compliant installation. As a general guide, a system flush typically costs £350–£800, while a magnetic system filter may cost £65–£300, depending on the installer and system layout.

Together, these steps help protect the Greenstar 2000 combi and reduce the likelihood of avoidable faults over time – so we highly recommend you factor these into your budget, we have included the price of these additions in the higher end of our estimated installation costs.

Finding a Gas Safe registered engineer

To ensure work meets safety regulations and is completed to the best standard, it is a legal requirement that a Gas Safe registered engineer installs your gas boiler.

Before choosing an installer, it’s a good idea to gather quotes from several Gas Safe registered engineers. This allows you to compare pricing, experience, and recommendations, helping you find the right installer.

You can also use the WhatPrice quote service to be matched with vetted, Gas Safe registered installers in your area. 

Reviews and ratings

Worcester Bosch is one of the most highly rated boiler brands in the UK, with an overall “Excellent” rating of around 4.6 out of 5 stars. Considering the volume of reviews –  nearly 50,000 reviewers – this is a standout score. There is widespread satisfaction with product quality, reliability, and service.

We’ve collated reviews specifically relating to the Worcester Bosch Greenstar 2000 combi, which you can see below: 

Positive reviews

Almost every positive review mentions how quiet the unit is. Homeowners describe it as a “quiet little workhorse” with “whisper quiet” performance, and note that it is significantly quieter than their previous boilers, making it perfect for installations near bedrooms or in open-plan kitchens.

Users report that the boiler “heats radiators much quicker” than their old systems. Many mention that their homes feel noticeably warmer even on lower settings.

Equally, several reviewers have noted a decrease in their energy bills and gas consumption after switching to the 2000 series, citing its high efficiency and ECO Mode.

The modern, sleek look is highly praised. Many highlight that it fits brilliantly into kitchen upgrades and tucked-away cupboards without being an eyesore.

The digital interface is frequently described as “simple and intuitive,” and the compatibility with smart apps like Hive or Bosch’s own EasyControl is a major plus for tech-savvy users.

Negative reviews

A common negative point is that it can take a “long time for hot water to come through” to the taps. Some users feel this leads to “wasting an awful lot of water” while waiting for it to reach temperature. 

💡 WhatPrice Tip: Whilst the Greenstar 2000 features QuickTap technology for speedy hot water delivery, some users find there is still a slight delay in delivery. To get the most out of this feature, remember to ‘signal’ the boiler by flicking the tap on and off 30 seconds before you actually need the water.

Some reviewers felt that add-on parts like flue extensions or specific brand-name filters were “criminally expensive” compared to standard universal parts.

Whilst a very small number of users reported minor internal leaks within the first 6-10 months. However, most of these reviews also mention that Worcester Bosch’s aftercare was “10 out of 10” and resolved the issue quickly under warranty.

One reviewer mentioned the boiler “primes regularly throughout the night,” which can be a minor annoyance if installed very close to a bed, though this is usually a setting that can be adjusted.

How the Worcester Bosch Greenstar 2000 combi compares

Choosing the right boiler often comes down to balancing price, size, efficiency, warranty, and everyday performance. The Worcester Bosch Greenstar 2000 combi sits at the entry-level end of Worcester Bosch’s range, offering quiet operation and strong efficiency at a lower upfront cost than the brand’s more premium models.

Its closest competitors are the Ideal Heating Logic Max Combi2, Baxi 400 Combi 2.1, and Viessmann Vitodens 100-W, all of which target similar property sizes but differ in warranty length, internal components, and price.

Below is a comparison to help highlight how the Greenstar 2000 compares.

Worcester Bosch Greenstar 2000 Combi Comparison Table
Make and Model	Pros	Cons	Cost (excluding installation)
Worcester Bosch Greenstar 2000 Combi	Very quiet operation (Quiet Mark certified) ErP A-rated efficiency Compact, modern design Frost Protection QuickTap and ECO Mode features Worcester Bosch scores 4.6/5 on Trustpilot	Shorter warranty than some competitors  Fewer built-in smart features as standard Limited output range (25kW, 30kW)	£950
Baxi 400 Combi 2.1	94% energy efficiency (ErP A-rated) Compact build Whisper-quiet operation   Long-lasting brass hydraulics and a stainless steel heat exchanger Lower cost and value for money  Baxi scores 4.6/5 on Trustpilot	5-year standard warranty – no options to extend  Output sizes are not suitable for very high hot water demand (24kW, 30kW and 36kW) Features are basic compared to other Baxi series	£770
Ideal Logic Max Combi2	10-year standard parts and labour warranty 94% energy efficiency (ErP A-rated) Compact size Includes system filter Built-in frost protection Ideal scores 4.8/5 on Trustpilot	Occasional issues with customer service Fewer output sizes than others (24kW, 30kW and 35kW) Not as quiet as other brands	£1,100
Viessmann Vitodens 100-W Combi	5-year standard warranty (extendable to 12 years) 94% efficiency Stainless steel heat exchanger(longer lasting) Compact, modern design 4.4/5 on Trustpilot	Higher upfront costs than other brands  Fewer UK engineers means longer wait times Parts are harder to source in the UK and can be more expensive	£1,915

Keep in mind that this comparison focuses on key features, but there may be other details that matter more for your home. For personalised guidance on choosing the right boiler, we recommend speaking with a Gas Safe registered engineer.

Final thoughts – is the Worcester Bosch Greenstar 2000 combi right for you?

One of the standout aspects of the Greenstar 2000 is how quietly it runs. Both the 25kW and 30kW models are Quiet Mark certified and operate at around 47 decibels, making them some of Worcester Bosch’s quietest combi boilers. This low sound level means the boiler can be installed in kitchens, utility rooms, or near living spaces without causing noticeable background noise during operation.

The Greenstar 2000 is also designed to be future-ready as well as practical, with compatibility for a 20% hydrogen blend mixed with natural gas and full LPG compatibility for off-gas properties. Whilst it cannot currently be converted to run on 100% hydrogen, it is fully future-proofed for the first phase of the UK’s green gas transition.

When compared with similar models, the Greenstar 2000 sits comfortably between budget and premium options. Against the Baxi 400 Combi 2.1, it costs more upfront but offers a wider modulation range and unique QuickTap and ECO Mode features, which can save you money in the long-run. Compared with the Ideal Logic Max Combi2, the Greenstar 2000 doesn’t match the longer standard warranty or bundled system filter, but it benefits from lower noise levels. And while the Viessmann Vitodens 100-W offers a stainless steel heat exchanger and longer potential warranty extensions, it comes at a significantly higher price and can be less convenient to service in the UK. 

Overall, the Greenstar 2000 strikes a balance between price, quiet performance, and brand reassurance, making it a sensible middle ground for homeowners who value reliability and some unique perks without stepping into premium pricing.

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