At Hillview, the HeatingSave controller is linked to a computer which shows them the daily heating costs together with the kilowatt-hours and the CO2 produced. Bryan's comment was, "The PC graph and graphical functions have been the most value for us, and is what I like the most. I now feel I actually have control over the set-up. With the graphs I can see when the boiler is switched on, what the temperature's doing, when it cuts off and even what happened two weeks ago".