What is the minimum water pressure required for the T80 Easi Fit to operate correctly?

The minimum running pressure required is 100kPa (1.0 bar) at 8 litres per minute for both the 8.5kW and 9.5kW models. If water pressure falls below this minimum, the low pressure cut-out will operate, switching off power to the heating elements to prevent unsafe temperature rises. Water will continue to flow but no heating will occur until adequate pressure returns. (Page 2)