John Mcmillan
Are you leaving the peak i.e. main electricity on to the boiler all the time as the boiler needs this to operate the pump, PCB and sensors for the plate heat exchanger to produce the hot water, The boiler will only heat the hot water store if you press the boost button on the front of the unit and the indicator lights up red, it is very common for the main electric to be turned of by the customer to save money and not heat the water store at peak times, this unit works very different from most cylinders it uses the off peak to heat a store hot water which it then pumps through a plate heat exchanger to produce hot water for the tap, the stored water and the water coming out the tap are different. hope this helps
