economy 7 controller

[rogerorkney]

any recommendations on which type to go for and price of such an item?
the horstmann e7bx is a bit dated looking!

edit: sorry for posting in plumbing area, wasn't 100% sure which way to go with it

 

[rogerorkney]

brief explanation of what i am needing to know:

i have a cu connected to cheap rate via a radio timer and a cu connected to standard rate.

i assume a cable to capacity 3Kw (2.5mm) runs from both CU's to the "controller" then a single cable runs to the water heater.

so i have to use an economy 7 controller

or

i run a cable from cheap rate cu to a "controller" to allow the bottom element to heat during off peak.
then i run a cable from the standard rate cu to a booster switch and then on to the upper element to heat when pressed.

can i do this, which is best?

 

[RF Lighting]

I would go with the second setup personally, then you will be doing all your water heating with off peak unless you need extra. Also with the second option you will still be able to have hot water if one of the elements / supplies fails (nice as an emergency backup).

 

[rogerorkney]

i run a cable from cheap rate cu to a "controller" to allow the bottom element to heat during off peak.
then i run a cable from the standard rate cu to a booster switch and then on to the upper element to heat when pressed

ok if i go with this plan,

i know which booster switch.
but what type of controller should i use for the off peak control, any recommendations please?

 

[kai]

A DP Switched 13amp Fuse-Connection unit fed from the economy seven will be perfect for the off peak circuit to the bottom element.

The economy seven supply only powers up in cheap rate hours to heat the hot water - leave the O/P E/7 FCU switched on all the time like I do.

 

[rogerorkney]

do i also need to use a double pole 16A MCB for each immersion also? one in each CU