Pulsacoil 2000 optimum timer settings

I looked around the forums but couldn't quite find the answer nor could I within the user guide.

Moved into a new flat with a pulsacoil 2000 which has a timer switch with the following options
Manual boost
Timed boost
Plus a boost switch.

The flat has economy 7 and wondered what the optimum settings are for the timer, never using a system like this.

The current setting is timed boost between 3am and 4am and we have enough hot water in the morning for 2 showers but that's about it. From reading the instructions there should be a steady stream of 'warm' water but this doesn't seem to be the case.

Any advice would be greatly appreciated.

Thanks in advance.

E7 means half price for that period.
You need to heat the unit for 7 hours.
Mike