A widely accepted practice that most pressure washing professionals would adhere to involves using the mains water supply from a customer’s house, and a big part of the reason why that is the case has to do with the fact that this helps them to avoid the troublesome process of having to haul water tanks along with all the rest of their equipment at any given point in time. However, one thing that should be kept in mind here is that you can’t just extract water directly from the plumbing in some way, shape or form.
Suffice it to say that doing so would create the kind of circumstance in which your customer’s pipes might get blown out due to fluctuations that can naturally occur during katy pressure washing processes. Hence, experts in the field usually work around this by connecting a feed line to the mains that leads to a buffer tank. They then allow the buffer tank to continuously fill up with liquid, and this basically turns into the reservoir from which they would derive their required water supply.
If you want to plumb your feed line directly to the buffer tank, the best tap to use is the one that your customer has in the garden. Turn the tap off before connecting the hose, and make sure that both ends are where they need to be before turning the water on otherwise you would end up wasting quite a lot of it. Once the connection is made, turn on the water so that the buffer tanks starts to fill up and you can start pressure washing not long after.