Hi @dsagar,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
There is no requirement to register your pressure washer to qualify for the 3-year warranty.
If it fails within the warranty period, return the machine to your local store with your proof of purchase and we will replace it.
Saving a picture of your receipt on a hard drive or phone is a good way to ensure you don't lose it.
Let me know if you have any further questions.
Jacob
