Andy Burns formulated on Wednesday :
That bit makes no sense at all.
There is no reason why the IHD cannot provide an accurate costing - they have an accurate standing charge, an accurate cost per unit, an accurate meter reading and an accurate time/date - all fed to them by the meter via the utility provider.
My experience of my SM when it was fully functional, was that it just kept on toting up the cost and completely ignored the fact that you had paid anything off the bill. There was also no way to display the actual meter reading either on the IHD, you had to check this on the utilities website.
So, the only useful thing my IHD did, was give an instantaneous consumption value for the E&G.
The SM installations were a major missed opportunity to do it right.