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Worcester Bosch boilers review
Our latest boiler survey reveals what customers and engineers think of UK-based brand Worcester Bosch, and how reliable its boilers are.
Customer satisfaction for Worcester Bosch gas boilers is high – it's the only brand in our survey to score top marks among customers, with the full five stars.
But customer views only make up 20% of our overall assessment. We've also asked 230 expert engineers to score Worcester Bosch gas boilers on six key factors, plus we found out what proportion of these boilers develop faults.
Only Which? members can access our full results. Log in now or join Which? to find out the best boiler brands and how Worcester Bosch boilers stack up against the competition.
Worcester Bosch gas boiler score
| Best Buy | Reliability | Customer score | Overall engineer score | Ease of sourcing | Ease of replacing | Ease of servicing | Build quality | Unbiased recommendation | % Score |
|---|---|---|---|---|---|---|---|---|---|
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Get instant access to this and all our scores and recommendations.
Unlock tableFirst month £5, then £11.99 per month, cancel at any time
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From our May 2024 UK general public online survey of 10,028 people who are responsible for the maintenance of their boiler and our May-June survey of boiler engineers. This included 7,619 gas boiler owners, 1,387 electric boiler owners, 448 oil boiler owners and 230 Trusted Trader boiler engineers. Worcester Bosch sample size: 1,934. The Total score for all types of boiler ignores price and is based on: Reliability (40%) How many boilers bought in the past six years developed a fault, factoring in time until first fault and severity. Fault had to be repaired by a trained plumber or engineer. Engineer score (40%) Made up of 15% ease of sourcing parts, 15% ease of replacing common components, 15% ease of servicing, 10% manufacturer support, 20% build quality, 25% unbiased recommendations (barring incentivised engineers). Customer score (20%) How satisfied owners are plus likelihood to recommend a brand. Best Buy threshold for gas boilers: 75%.
Customers who bought their boiler in the past six years were very pleased on the whole, giving the brand a five-star customer score.
This paints a very positive picture of the brand. While overall boiler customer satisfaction is high, Worcester Bosch boiler owners are even more satisfied.
We've revealed the customer score of every gas and oil boiler brand we've reviewed, but only Which? members can access the full reviews. These include objective reliability measures as well as the opinions of expert engineers.
Log in now or join Which? to see the whole picture, including our full verdict.
Engineers' review of Worcester Bosch
Engineers' review of Worcester Bosch
Only Which? members can see the engineers' review of Worcester Bosch boilers.
We heard from 230 expert engineers, who scored boiler brands for several aspects. We asked them to score gas boiler brands on the following:
- The ease of sourcing spare parts
- How easy it is to change a common component (a heat exchanger)
- The ease of servicing the brand's boilers
- The build quality of the brand's boilers
- The quality of technical support provided by the manufacturer
- Whether or not engineers would recommend the brand to consumers (we filter out incentivised and brand affiliated engineers).
We aggregate all these scores and use them to create our overall engineers' score, which makes up 40% of our total brand score.
Which? members can see how engineers rated Worcester Bosch gas boilers on all of these tests by logging in, while others can sign up to Which? to unlock our full analysis.
Worcester Bosch gas boiler reliability
Boilers are major purchases you should only need to make once every 10-20 years. You can keep yours for longer if you get it regularly serviced and if you get faults fixed quickly.
We've asked people who bought a boiler in the past six years about whether it's fault-free. When faults are reported, we measure how serious the fault was, how long it took for the first fault to happen, and we make sure it was fixed by an engineer.
Using this data, Which? members can see which brands produce boilers that are less prone to faults than others.
Regular servicing is key to an efficient, long-lasting boiler. See our guide to getting the best boiler service.
Worcester Bosch gas boiler costs
Combi boilers
| Boiler name | Sizes available (kW) | Standard warranty (years) | Extended warranty (years) | Price range (smallest kW output and biggest kW output) |
|---|---|---|---|---|
| Greenstar 1000 | 24; 30 | 5 | 5 | £704 - £772 |
| Greenstar 2000 | 25; 30 | 7 | 7 | £851 - £961 |
| Greenstar 4000 | 25; 30 | 7 | 10 | £1,127 - £1,274 |
| Greenstar 8000 | 30; 35; 40; 45; 50 | 8 | 12 | £1,510 - £2,747 |
| Greenstar CDi Compact | 28; 32; 36 | 7 | 10 | £1,180 - £1,550 |
| Greenstar CDi Highflow | 29.5; 41.2 | 7 | 10 | £2,771 - £3,058 |
Regular boilers
| Boiler name | Sizes available (kW) | Standard warranty (years) | Extended warranty (years) | Price range (smallest kW output and biggest kW output) |
|---|---|---|---|---|
| Greenstar Ri | 12, 24, 27, 30 | 7 | 10 | £1,009 - £1,369 |
| Greenstar CDi FS Regular | 30; 40.8 | 7 | 10 | £2,014 - £2,484 |
| Greenstar Utility | 32-50; 50-70 | 2 | 7 | £3,036 - £3,269 |
| Greenstar Danesmoor External | 12-18; 18-25; 25-32 | 2 | 7 | £2,539 - £3,163 |
| Greenstar Danesmoor Utility | 12-18; 18-25; 25-32 | 2 | 7 | £2,064 - £2,915 |
| Greenstar 8000 | 30; 35; 40; 45; 50 | 8 | 12 | £1,555 - £2,776 |
System boilers
| Boiler name | Sizes available (kW) | Standard warranty | Extended warranty (years) | Price range (smallest kW output and biggest kW output) |
|---|---|---|---|---|
| Greenstar 8000 Style | 30; 35 | 8 | 12 | £1,617 - £1,794 |
| Greenstar 8000 Life | 30; 35 | 8 | 12 | £1,549 - £1,797 |
Where to buy Worcester Bosch boilers
It's easy to rush into making a decision, especially if your boiler breaks down in winter, but we recommend getting a couple of quotes from qualified heating engineers and comparing costs. Our Trusted Trader service can link you up with vetted boiler installers in your area.
You could also buy a boiler yourself and then hire an installer, but first make sure you seek expert advice to have your current heating system assessed and identify the type of boiler that meets your specific needs. If you buy a boiler without having an installer lined up, you could find yourself struggling to find someone willing to set it up for you. An installer may have access to trade or wholesale prices and will be able to recommend a model based on a holistic assessment of your home and heating system.
Only a Gas Safe registered engineer/installer can install a new boiler: it's dangerous and illegal to do so yourself if you're not qualified.
Read more: where to buy a boiler
Are Worcester Bosch boilers efficient?
New boilers must be A-rated, but how efficiently your boiler works in practice depends on several factors, including how you use it and how well it's installed. Use a Which? Trusted Trader for your boiler installation and regular maintenance.
Head to our guide to boiler energy efficiency for more information.
Visit Worcester Bosch to find out more about Worcester Bosch boilers.
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