What I would personally do, is to look around my neighbourhood to find people who already have pressure washers. Ask them for their personal thoughts, pros and cons etc on the model that they have, and while you are there, take a mental note of where they keep them overnight, and what security measures they have in place...
Then, work out the who has the best washer with the least security, pop over on Xmas eve (disguised as santa, so as you don't get noticed / recognised) in the night and steal it...
By the time suspicions are raised and police are called, you will have already given it to your Dad for Xmas, and as such, if the police search your property, it will be nowhere to be found...
You're welcome
