What is an electric shower?

An electric shower is essentially a water heater. It relies on heating mains-pressure cold water very fast as it flows towards the shower head. There is no pump involved, so the amount of water you get through will depend on your mains water pressure.

Electric showers are economical as you heat only the water you need, and they're the only type of shower that's independent of the hot water system, so if your boiler fails you can still have a hot shower.