UK Off-Peak / Peak Immersion Heaters

[mattnarb]

Hi All, my flat has Off-Peak and Peak power supply and the hot water is produced via 2 immersion heaters, the bottom element is fed by the Off-Peak supply and the top one by peak (24hr) supply. As immersion heaters have a limited life span, I'd like to have more control of the Off Peak element and would like to know whether it's possible to wire the bottom immersion heater to both the Off-Peak and Peak supply so I can switch between the supply whenever necessary?

If this can be done, could the existing digital controller also be used when control the bottom immersion heater (when operating in the Peak mode)?

Thanks in advance for any help.

 

[oscar21]

Electrician is talking rubbish, the E7 timer instructions even mention putting a link between the off peak and on peak terminals when there is only one element.

Also how can the timer be connected to the off peak supply, the time will go wrong every time the off peak supply goes off. Needs wiring to the 24hr supply.

https://free-instruction-manuals.com/pdf/p3133739.pdf