Help using my boiler / hot water heating

Moved into my new house and I am stumped with how to use the buttons on my boiler correctly. 

It is an intergas compact HRE 24 OV, with lpg gas tank. I am trying to adjust hot water temp, I can adjust radiator temp but I can't select the hot water at all. At the moment it is scalding hot. I am heating it from 2am-4am via the nest thermostat, although this button on the wall also heats up the radiators manually and I can't figure out why or what it actually is. Or how I should be using anything. My previous house had a bosch combi boiler but there was no setting it on a timer on a thermostat so I am soo confused and going round in circles. I'm basically unsure if what I'm doing is seriously energy intensive and overkill or is there a really simple way of using the system.

There is also these pipes in a cupboard (different room to the boiler) which I'm not sure if they are of significance. 


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