Immersion heater - economy 7 timer wiring

Thank you for the pictures they do indeed help.


You have 2 immersion heaters, one at the top for when you pnly need half a tank. and one at the bottom for the whole cylinder.

you may be able to work out by touching the silver cloured caps if both or just one is operating, after about 15mins.


The metering, oh boy. To be sure it would be good to see a bit more at the top of the pic, to verify the connections into that black box at the top (the 'henley block')  and  I assume there is a consumer unit near by with lots of fuses or breakers but here is what I think I see.

You only have one supply to the rest of the building, not two cables one for Off peak one for day rate - this makes things easier.

Shiny new meter (the white bit) and time switch (clock - the black thing ) is state of of the ark.


The clock uses the little thin wire between it and the meter to tell the meter which of the two counters it has is the one to be  used right now. (the thin wire will be at a voltage near live when it is one rate, and near neutral when it is the other.)

(and when the meter is read, there are two numbers one is the running total for day units and the other for night units )

So once the time switch has gone clunk everything in the flat is charged as  cheap rate, until it goes clunk again.


And where is the heating controller, and how do we ensure that  it's times match those of the E7 metering clock ?

Thank you for the pictures they do indeed help.


You have 2 immersion heaters, one at the top for when you pnly need half a tank. and one at the bottom for the whole cylinder.

you may be able to work out by touching the silver cloured caps if both or just one is operating, after about 15mins.


The metering, oh boy. To be sure it would be good to see a bit more at the top of the pic, to verify the connections into that black box at the top (the 'henley block')  and  I assume there is a consumer unit near by with lots of fuses or breakers but here is what I think I see.

You only have one supply to the rest of the building, not two cables one for Off peak one for day rate - this makes things easier.

Shiny new meter (the white bit) and time switch (clock - the black thing ) is state of of the ark.


The clock uses the little thin wire between it and the meter to tell the meter which of the two counters it has is the one to be  used right now. (the thin wire will be at a voltage near live when it is one rate, and near neutral when it is the other.)

(and when the meter is read, there are two numbers one is the running total for day units and the other for night units )

So once the time switch has gone clunk everything in the flat is charged as  cheap rate, until it goes clunk again.


And where is the heating controller, and how do we ensure that  it's times match those of the E7 metering clock ?