Worcester Bosch verse Vaillant Boilers, they are simply the best in the UK. So which one is the best boiler for your home?

When it comes to buying a boiler you really need to decide which boiler is best for you. The two popular boiler brands are Worcester Bosch and  Vaillant Boiler. Both of these brands are truly loved by British homeowners and they both consistently come out on top on Which? customer satisfaction surveys. So what’s the main difference and which is the best boiler for you. In this review, we aim to spell out the main differences and give you our verdict.

Worcester Bosch History

Formed in 1962  by Ceil Duckworth and over the years they developed an excellent reputation in the UK, in 1n 1992 they were bought out by the German giant Bosch and formed the Worcester, Bosch Group. Today they are renowned for excellent product manufacturing and have a good reputation based on boiler efficiency, reliability and value for money.

Vaillant are a German family-based business with an excellent reputation. The company was founded by Johann Vaillant in 1894 where they patented a new gas closed system boiler. They too have developed an excellent reputation over the last 140 years of trading.

You will find both of these boilers in the Which? Best Buys section and has an excellent reputation on Trustpilot which are independent reviews from customers.

Both these manufacturers have won awards for excellence with the Vaillant boiler winning awards for the Quiet Mark accreditation by the International Eco-Award Scheme to manufacturers of the quietest products. This offers an excellent reason to chose this boiler if you need one installed in a bedroom.

Boiler Comparison

 For this review, we are going to compare two boilers like for like so we pick for this our best selling boiler. The Worcester Greenstar 30 and the Valliant EcoTec Pro 30. 


Greenstar 30i
Valliant EcoTec Pro 30
ErP Efficiency Rating A (93%) A (89.4%)
LPG Models Available Yes Yes
Central Heating Output 30 24.7
Hot Water Output 24 27.2
Dimensions H – 710 mm W – 400 mm D – 330 mm H – 720mm x W – 440mm x D – 330 mm
Flow Rates 10.8 litres per min 12.3 litres per min
Manufacturers Warranty Up to 12 years Up to 12 years


Repairs and Warranty 

Both companies have an excellent reputation for speed of service and availability of parts. We know that when you have a boiler break down the availability of parts is essential, speed of service to get your going again on the coldest of days. Both Worcester Bosch and Valliant have 100% part availability in the UK.


Worcester Bosch now comes with an 8-year warranty as standard and this can be extended to a whopping 12 years. To ensure you warranty is in place you need to have your boiler serviced each year. This service history is worth keeping in place just in case you do experience a boiler breakdown. At Clever Energy Boiler we offer service plans for you on a monthly subscription so you don’t have to think about payments when your service is due. 

Vaillant offer up to 12 years as well so there is very little difference, it is worth saying that both companies require you to service your boiler once a year to keep the warranty in place. So please be warned and keep your servicing up to date.

In Conclusion

Both boilers manufacturers offer excellence in product and service, they both have won industry awards for efficiency. It really is very close for both these boilers, the only difference is the Vaillant is slightly quieter on startup. As Worcester Bosch accredited dealers we highly recommend the Worcester Bosch range of boilers as we have loads of experience in this field. We offer Vaillant as well as some customers simply love the brand and this comes down to preference. If you require any further help with your boiler installation do not hesitate to call on 0 

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vaillant eco tec pro 30

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What customers say about Clever Energy Boilers

My wife and I would like to thank you all for the competence and excellent work carried out at our home, from the estimate and the fitter who plumbed in the new boiler, to the electrician who made our programmer work with the boiler, an excellent team of manpower seldom seen with so called professionals.

Mr & Mrs Sheen, Doncaster

Thanks Tom for all your patience and time you spent answering all my questions and promptly ringing me back each time and thanks to your office staff always polite and helpful, a big thank you to John and Chris for installing the boiler and all the other jobs, both worked efficiently and cleanly, John was very good explaining everything as he went along. 

Mr Peacock, Holmfirth

I am very happy with the service I received. My new boiler has been installed very quickly and hassle free, I would definitely recommend this service.

Moyra Thomas, Stockport

Rizwan was a very good engineer he was very clean and made the place spotless after he had gone.

Mary Jones, Birmingham

Brilliant service from all the team. Thanks. Our old boiler died and from a very reasonable quote to fitting a new one within a couple days. Excellent advice and workmanship too.

Adrian Charlton, West Yorkshire

My old boiler went kaput, Clever Energy Boilers gave me a great price and fitted my new boiler within 3 days. Very pleased with the work carried out and would not hesitate to recommend to anyone needing a new boiler. A big thank you to both the installation team and the electrical man, both first class.

Mr Herbert, Yorkshire