Mira Zest 7.5 Installation, Operation And Maintenance Manual page 18

Temperature rise versus flow rate for the Mira Zest range
55
50
45
40
35
30
25
20
15
10
(a) These curves are for the specified outputs at 240V.
(b) All appliance heating elements have a manufacturing tolerance. Thus flow
rates can be above or below those indicated.
(c) The left-hand scale is temperature rise. (Temperature rise = Showering
temperature minus the incoming cold water temperature.)
Example: For the Mira Zest 8.5 kW on full power setting with an incoming water supply
at 10°C and a showering temperature at 42°C, the temperature rise is 32°C. The flow
rate is therefore, 4 l/min.
18
7.5kW
0 1 2
3
Flow rate (litres per minute)
8.5kW
4 5 6 7 8 9 10