by marrtin »
Mon Nov 26, 2007 9:21 am
Switching on the immersion at 11pm is I am afraid the worst thing you can do. Economy 7 is between 1am and 8am, and those two hours between 11pm and 1am at standard rate are just about the length of time it takes to heat the water.
If you intend to replace the heating next year, it seems pointless to have a timer fitted as the installation costs involved will be more than the savings.
So if you can't manage to switch on after 1am or before say 6 or 7am, I would suggest leaving it on 24hrs.