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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing).
Published: March 18, 2021. Updated: March 6, 2024

Worcester Bosch vs Vaillant Boilers

A Worcester Bosch vs Vaillant boiler brand comparison should help if you’re in the market for a new boiler. They’re both well-known brands and have a lot of similarities.

In this Vaillant vs Worcester comparison, our team take a look at the Worcester Bosch boiler range compared to the Vaillant boiler range. We’ve spoken to our heating engineers for their input; the below is impartial.

Both manufacturers have boilers in our best boilers guide, and both are in our top 3 boiler brands available in the UK.

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Worcester Bosch boilers

worcester bosch boiler range

About Worcester Bosch

Worcester Bosch was founded in 1962 in Worcester by Cecil Duckworth as an independent British company. Acquired by Robert Bosch GmbH in 1992, it still retains its UK headquarters in Worcester. With almost 60 years of experience, Worcester Bosch is a well-known and reputable household name in the UK.

Brand Reputation, Quality & Performance Benefits

  • Worcester Bosch, the top UK domestic boiler maker, has installed 1 million+ boilers in homes across the country.
  • The Greenstar boiler range has consistently been awarded the prestigious Which? Best Buy status every year since 2009.
  • Worcester Bosch boilers are made in the UK. Gas boilers are assembled in Worcester and oil boilers in Clay Cross, Derbyshire.

Value for Money, Warranties and Efficiency Benefits

  • Worcester Bosch can cost more because of its reputation.
  • Worcester Bosch offers a 10-year no-quibble guarantee on its products, covering replacement parts, call-out charges, and labour costs. However, the length of the warranty varies by boiler model with no standard guarantee period available across the range.
  • In terms of energy efficiency, Worcester Bosch and Vaillant’s boilers are very similar.
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Vaillant boilers

vaillant boiler range 2023

About Vaillant

Vaillant, a German family-owned business, entered the UK market in the 1970s and acquired Glow-Worm in 2001. Its domestic boilers have received the “Which? Best Buy” award for several years in the UK.

Brand Reputation, Quality & Performance Benefits

  • Vaillant’s technical helpline is often praised for its after-sales support.
  • Vaillant is a brand that consistently features in the Which? Best Buy report almost every year.
  • The entire range of Vaillant domestic boilers has been awarded Quiet Mark accreditation for their low operating volumes.
  • Vaillant boilers use stainless steel heat exchangers that retain efficiency better than the aluminium heat exchangers used by Worcester Bosch, which are prone to corrosion.

Value for Money, Warranties and Efficiency Benefits

  • Vaillant boilers have a stainless steel heat exchanger, but they aren’t more expensive than Worcester Bosch.
  • Stainless steel parts save money in the long run by reducing energy bills and improving reliability and longevity.
  • Boilers with reliable parts require fewer repairs, unlike Worcester Bosch boilers with their aluminum heat exchangers that need out-of-warranty repairs.
  • Vaillant offer 5 years warranty as standard, with 7 to 10 years available when installed by a Vaillant Advance installer.
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Worcester Bosch vs Vaillant Price Comparison

Both Worcester Bosch and Vaillant are not budget boiler brands. However, Worcester Bosch is generally £100 to £200 less expensive than Vaillant for similar boiler models.

It’s important to note that this price difference only applies to the boiler itself and not the installation costs. The total cost of a boiler installation will depend on additional factors such as the brand of the boiler and the installer you choose. Therefore, it’s advisable to consider all of these factors when getting a full boiler installation quote.

For example, an installation of a Viessmann boiler that is in the same ballpark as Worcester Bosch or Vaillant in terms of price maybe better value than either of these two brands. For example, a Vitodens 200-W is 98% efficient. Neither Worcester Bosh or Vaillant offer a boiler quite that efficient.

Worcester Bosch vs Vaillant

Dimensions and other features

Both brands are known for manufacturing compact boilers which can fit easily in your kitchen or anywhere else in your house. They both have larger, more powerful boilers too. These may struggle to fit inside a ‘normal’ kitchen cupboard.

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Thermostats and Smart Controls

Almost all boiler brands in the UK now have digital touch screens, and you can use programmable thermostats or smart controls like Hive or Tado.

Energy Efficiency

Both boilers operate at around 94% energy efficiency, which aligns with most modern condensing boilers.

However, if you’re not convinced by either Worcester Bosch or Vaillant, maybe try Viessmann. They’re another German brand with the best features of both. They also have patented internal components manufactured in-house.

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Worcester Bosch vs Vaillant boilers – final verdict

Both of these brands are great manufacturers. They offer good boilers at a consistent price. Both brands offer a range of boiler types, models and powers that should meet almost any home requirement.

Saying that our pick would be Vaillant.

Our reasons come down to these key points:

  • Vaillant has always been known as a premium brand which means the boilers are at a higher price point. However, Worcester Bosch is now as expensive. Considering the cheaper internal components of the Worcesters, Vaillant wins.
  • Vaillant is rated higher than Worcester Bosch for ease of service and repair.  This means Vaillant boilers should be easier to maintain.
  • Vaillant’s boiler range use stainless steel heat exchangers. This means efficiency is retained for longer. This translates to lower energy bills. It also means no corrosion-related issues. Worcester Bosch’s aluminium heat exchangers are prone to corrosion if not properly maintained.

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