"I was looking for a system that could run all of those (rooms), as they were run from time clocks before", Mr. Petter recalls. , "We had six time clocks that we used to get the on and off time for the heating in all areas, so part of the weekly routines was to look at our lettings, set up the time clock, have a guess at how long each room would take to heat up and set the time for that".