DHW controller

[SparkyTris]

pls could someone recommend a single (preferably double-width faceplate size) controller for an electric DHW system:

inputs:
2 separate incoming supplies (one remote-switched cheap rate, the other 24hr normal rate)

outputs:
2 electric immersion heaters (one 3kW at the bottom, one 2kW at the top)


Thanks

 

[Taylortwocities]

Erm, How do you want the "controller" to control?

Usually you have the off peak on all the time (heating up the water at night, with cheaper power) and a boost control for the top immersion that is used if the main tank runs out of hot water.

Please explain what you expect to happen.

 

[SparkyTris]

yes when I actually engaged brain I realised that's how it should be set up, so my Horstmann e-7 is just a controller for the boost at any time of day and the cheap rate is hardwired, and looks after itself.
thanks