How many watts maximum can we use in a UK wall socket?

[justice3000]

If it's single phase you don't need an inverter or transformer to run it off the single phase domestic supply.

But you do need the socket to be rated for supplying 7kw+ and the cable going back to the consumer unit to be rated for 7kw+ and the fuse/rcd to not trip with whatever peak the pressure washer draws. Easy work for an electrician.

If you're not able to get proper wiring done for it then get a pressure washer up to 3kw which comes with a domestic plug attached.

I want to use the machine at other peoples houses

 

[Jokester]

I want to use the machine at other peoples houses

You won't be able to do that without lugging about a 3phase diesel generator or a 3 phase battery/inverter set up of sufficient capacity.

 

[Hotwired]

I want to use the machine at other peoples houses

You've chosen a machine that isn't suitable. ~3kw electric pressure washer is the max for taking to someones house and plugging in.

 

[montymint]

I want to use the machine at other peoples houses

A fire waiting to happen

 

[justice3000]

It has a safe way to use. Needs an inverter or power adaptor

 

[Jokester]

It has a safe way to use. Needs an inverter or power adaptor

There isn’t on a domestic 3 pin plug.

 

[Deleted User 234324]

Domestic plug will be limited to a max 240v x 13A which is 3120w