How do i operate the creda 79153, i think i set it wrongly and it costing me more.thanks

You have to regulate the heat yourself by setting the room temperature dial to 1 for a low heat (say for the daytime if you are out) and a higher setting in the evening - Make sure you switch it back to the lower setting before you go to bed. This should make the heat last for most of the day - the other dial is to regulate the heat that is stored so in the summer set it to 1 and the winter store at a higher setting -hope this helps

they are storage heaters and they have bricks in them. They get heated during the night (economy 7), that starts according to what has been set on the system (there shd be a *** 'boiler' room where the economy seven is). Anyway they heat up from the evening say 8 pm to around 6 am. And because the bricks are hot they slowly release heat during the day depending on what level you have set your room temperature to. The overnight charge does what it says on the tin, in that the brick will heat to a level you have set it at. the higher it is the hotter it gets and the more heat you can have during the day.