Pure Pulse uses a "smart technology" which increases the pulse effect as the water pressure increases. In this way you need only unscrew your existing shower head, replace with Pure Pulse and you will achieve significant water/energy savings. Pure Pulse can be used in all systems including most electric shower units. Only systems with low pressure are unlikely to reach the required level of 0.5 bar.
Most electric showers already have an Eco friendly low flow rate, therefore here you will probably not save water but you will have our lifetime guarantee against limescale clogging. If in any doubt about suitability then please contact your Electric shower manufacturer