<snip>
> if this is the case what is the purpose of the horstmann timer as it
> seems an expensive item to replace just to have a tank of hot water in
> the morning. my electric shower would be more efficient than that.
> any advice would be greatly appreciated
Unless someone previously has done something quite stupid, the controller is
only there for the immersion heater. It shouldn't have any effect on the
storage heaters. The idea is to let the immersion heater come on during the
cheap rate period only to give you a full tank of hot water. It doesn't need
the full 7 hours, setting it to come on at about 4 a.m. is plenty long
enough to heat up the water. The boost button gives you an hour of immersion
heater during the daytime if you've used all the 'cheap rate' hot water. Go
back to the landlord and tell him you'd like it replaced, it's his problem!