Learn more about our guarantees

At Worcester Bosch we know a reliable boiler is the key to a warm and comfortable home year after year, and our commitment to high levels of quality and reliability enables us to be confident in the guarantee we offer our customers.

Put simply we stand by the guarantee we offer – Our approach is “no quibble” and we always aim to do right by our customers in the unlikely event something goes wrong.

There are a range of guarantees, warranties and forms of insurance that various companies will offer you for your boiler or wider heating system. To help you we have explained below the key difference between a guarantee and a warranty, as well as advising you on how you can get the longest guarantee possible for your new Worcester Bosch boiler.

What's the difference between a guarantee and a warranty?

The main difference between a guarantee and a warranty is that a guarantee is usually free, whereas a warranty typically includes a premium for the cover (much like a form of insurance). The great thing about a guarantee is that it is legally binding and adds to your rights under consumer law. For example, a boiler must legally come with a minimum of 2 years cover, but at Worcester Bosch we offer 5 years as standard, and you can easily get up to a 10 year guarantee by choosing one of our Worcester Bosch Accredited Installers.

Other differences include the fact that warranties sometimes only cover certain parts of a product. A good example of this is when you take out a warranty on a new or used car, only to find that tyres, brake pads and other items are not covered. Warranties also entitle manufacturers to charge for call outs, which can be an unwanted and unexpected expense. In contrast guarantees typically cover the whole product, and at Worcester Bosch we won’t charge you for a guarantee call out visit by one of our engineers providing that your boiler is serviced annually.

To provide extra protection to our homeowners we also extend our boiler guarantees to cover any other Worcester Bosch products installed at the same time; for example if your installer registers a Worcester Bosch control or filter which was installed at the same time as your boiler, you will also receive up to a 10 year guarantee on these items, despite only normally having a 2 year guarantee on these if they were installed individually.  

As with any warranty or guarantee we always recommend that you check the terms and conditions, as well as seeing what other homeowners and landlords are saying about a company and whether they honour their commitments in a fair and open way. At Worcester Bosch we take pride in our guarantees and our main request is that the boiler is serviced annually. Read the full terms and conditions

What's the standard Worcester Bosch guarantee?


  • Gas – 7 Years if fitted by a Worcester Bosch Accredited Installer (5 years for all other installers)
  • Oil – 5 Years if fitted by a Worcester Bosch Accredited Installer (2 years for all other installers)



  • Flues, Controls and System filters  – 2 Years (If fitted with a boiler it will increase so it matches the same guarantee length as the boiler)
  • Cylinders – 25 Years

I’ve seen a 10 year gas boiler guarantee advertised, how do I get a 10 year guarantee?

We offer an exclusive 10 year guarantee to customers who choose a local Worcester Bosch Accredited Installer to install their boiler along with a Worcester Bosch Greenstar system filter. We make this a requirement of our 10 year guarantees as we know that adding a system filter can prevent significant damage caused by dirt and debris such as rust, which builds up in your central heating system over time.

What’s the maximum guarantee I can get on an oil boiler?

Our Worcester accredited installers can offer up to a 8 year guarantee on Worcester Bosch oil boilers when you choose to opt for a system filter and a new Worcester Bosch cylinder.

Should I register my own guarantee?

No.  The task of registering your new boiler should be carried out by your installer.

 Please note if you register your appliance yourself you will only receive the standard guarantee length (5 years Gas and 2 years Oil). If you have any queries then please contact us.

For more information about our guarantee’s please visit our FAQ’s page or see our Guarantee Terms and conditions page.

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