A 22kW charger has the capability to charge your EV up to 22kW per hour. It is 3 times faster than a 7kW charger. 22kW charging can only be supported by households that have a 3- Phase electrical set up. Most houses in the UK are single phase and can only support a maximum 7kW charging output.
Bear in mind that the charging speeds from fast chargers will depend on the car’s onboard charger, with not all models able to accept 7kW or more. These models can still be plugged into the charge point, but will only draw the maximum power accepted by the onboard charger. For example, a Volvo XC60 T8 PHEV will a standard 3.5kW onboard charger will draw a maximum of 3.5kW from a 7kW power supply or 3-phase power supply.
A Porsche Taycan with an 11kW onboard charger will draw a maximum of 7kW from a single phase supply and a maximum of 11kW from a 3-phase supply.