Is 2200 PSI enough for washing a car?

Yes. 2200 PSI is more than most compact electric washers and is plenty for car paint, wheels and garden furniture, provided you use the wider nozzle and keep the wand moving.

What does liquid-cooled mean on a pressure washer?

The motor is cooled by liquid rather than by air alone, which Yard Force says keeps temperatures lower and extends motor life. It is a durability claim, not extra cleaning power.

Can I use it with a foam cannon or surface cleaner?

It uses standard trigger-gun and wand fittings, so common accessories that match those fittings should attach. Check the connector type on any accessory before buying.

Does it need a water tank or can it run from a tap?

It is fed from a normal outdoor tap through a garden hose. It needs a steady water supply; it is not a cordless unit with its own tank.

How does it compare with a gas pressure washer?

It is lighter, quieter and needs no fuel or oil changes, but gas units deliver higher pressure and flow for heavy jobs. For cars and furniture, this electric unit is the easier choice.