No hot water Hortsmann 7

[brianmoooore]

Expensive if you use it during the day, but, assuming there's a modern dual rate tariff, and not some ancient twin meter set up, exactly the same cost IF the boost is used between 12 midnight and 7 am.
Note that the 12 to 7 might be GMT, so 1 to 8 in the summer.

 

[Superman]

Hey guys thanks for your help. For the past 3-4 days my mum has been getting hot water after setting the off peak timer properly. Currently I have set the off peak timer to come on at 3am and go off at 7am. In your experience with this type of timer would you say this is too long to have on? Would you recommend a shorter duration perhaps?

 

[brianmoooore]

That duration sounds fine. Once the cylinder has heated up, the thermostat inside the immersion heater will switch off, and no more power will be consumed.
Of course, once the water has heated, heat will begin to be lost from the cylinder, but as long as it's well insulated, this will be minimal.