Showering Maximum Flow Rate - Mira Mode 1.1980.001 Installation And User Manual

Showering Maximum Flow Rate

Note: The Switch shower handset is flow regulated to 12 L/min. Regardless of
your mixing valve settings or water system capabilities, the flow rate achievable
through this handset is limited to 12 L/min.
Combination Boilers
Note: The digital mixing valve can demand hot water quicker than some instantaneous
water heaters/combination boilers can provide, especially in winter when the mains
water is colder. It is therefore possible this mixing valve will need to have its outlet
flow rate altered to match the capability of the water system.
The outlet flow rate can be altered by use of the Mira Showers app.*
High flow rate demanded from low kW combination boilers will result in poor blend temperature
stability and could result in your shower going cold. We strongly recommend you to alter the
outlet flow rate as the table below.
Boiler Rating
Outlet Flow Rate
Gravity System
A gravity fed hot water cylinder has a finite amount of stored hot water. A standard
size hot water cylinder, e.g. 230 Litres, with stored water heated to 65˚C will typically
provide a showering duration of 30 minutes when the shower temperature is set to
mid-blend (approximately 40˚C) and at a flow rate of 9 L/min. With the flow rate set to
12 L/min it will reduce the total showering duration to typically 20 minutes.
Once the stored hot water has been depleted, sufficient time will be required for the hot water
cylinder to reheat its stored water supply before additional showering time can take place.
The outlet flow rate can be altered by use of the Mira Showers app.*
It may be necessary to alter the outlet flow rate using the Mira Showers app if your stored
hot water is running out too quickly.
*Note: If your water system is not capable of delivering minimum maintained pressure
at the valve inlets, you will not be able to achieve the maximum flow rate from your
shower even if adjusted via the Mira Showers app. Ensure you have the minimum
required maintained pressure at the valve inlets before installation.
18
24kW (80,000 Btu/h)
8 L/min
30kW (100,000 Btu/h) 36kW (120,000 Btu/h)
10 L/min 12 L/min