Paul Barker said:
I have to replace a cylinder with two 11" Immersion's. There is an economy 7 timer on the wall beside with the nighttime output going to bottom immersion and the boost to the top. Can I replace the cylinder with a single immersion and combine the leeds into one?
For future reference, DO NOT DO THIS.
EVER.
The two elements are fed from different supplies.
If you did connect them together you would backfeed the entire off peak installation from the peak supply, blowing the fuse, but every time the off peak supply powers up the element will come live as will the top of the blown fuse, now fed from an entirely different supply.
Two supplies in one fusebox.