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What is a Glow-worm guarantee?

Your Glow-worm guarantee covers you for the repair of any defects related to the manufacture of your Glow-worm appliance. The repair has to be completed by one of our Vaillant Service Engineers and will cover both parts and labour.
Your guarantee does not cover defects which are unrelated to the manufacture of the product or a result of misuse. We’ll send you the full terms and conditions of the guarantee along with your guarantee confirmation. Alternatively, you can read them here.

Terms & Conditions for our domestic boiler range

Before you register your guarantee, here's what you'll need

We’ll need the following information about your appliance:

  • Serial number*
  • Gas Safe registration number of installer
  • Date of installation
  • Installation address
* Your 28 digit serial number can be found on the control panel of the boiler and in the benchmark logbook which your installer should have provided you after the installation.
As soon as your boiler is installed, you need to register the guarantee.

You can also receive exclusive extended warranties of up to 10 years through your Glow-worm Club Energy Installer.

We recommend you register within 30 days of installation to ensure you’re protected. As soon as you’re registered, our nationwide team of Vaillant Service engineers will be on hand to help should anything go wrong and replace parts free of charge if required.

*Glow-worm is a trading name, brand and registered trademark of Vaillant Group UK Limited.