- Handset flow rate is 8.6 litres per minute at 0.5 bar of pressure. - The included flow regulator is 9 litres per minute. Mira Opero Chrome Thermostatic Mixer Shower Intuitive On/Off Functionality Only the best things are started by button and your shower is now one of them. There s no more swinging the mixer lever trying to locate that impossible to find perfect temperature. Simply turn the shower on and then off using the easy-to-use push button. Step Straight Into Perfection Know your perfect shower is ready to go thanks to Mira HydroGlo technology. Using only the high power of water running through the valve, it illuminates to show you that your shower is ready to step straight into. No batteries or plug socket needed! One Is Good. Two Is Better With the .