The mains pressure feeding into the pump system is regulated to give priority to the tank water when available. We can increase this a little but it must remain below the pump pressure otherwise your pump will not turn on and draw water from your tank. Your pump delivers about 450kPa and the mains is regulated to around 300kPa. We can increase the regulated mains to just under 400kPa.
If you would like this adjustment to be made please contact our service team and we will get that booked in for you.