[Kodak]

@retrotecchie
Thank you so, so much. I'm lost for words.

[meldrewreborn]

@Kodak

While you say Eon Next haven't been of much help, as @retrotechhie has explained yours isn't an RTS setup, and everything downstream of the meter(s) is your responsibility and entirely within your gift to organise as you wish. I call things as I see them and feel that perhaps you're expectation of Eon Next were a tad too high in respect of a meter change, although they have long persisted with a charging regime which is clearly wrong and they haven't done too much to resolve that, have they?

At least Eon Next facilitate this forum, which you concede has been a great deal of help in advising you on the way forward.

Ovo has a similar forum, but I'm not sure whether any of the other big 6 does.

[Kodak]

@meldrewreborn
My criticism of eON is mostly down to the poor communication over the meter changes.

Their call centre had on my record that my complex meters were to be changed, but they hadn't told me about it.

I found out about the need to change the meters and their March deadline only when I raised a query about the naming of my tariff when I called to give a meter reading.

To date, they still haven't formally told me, though the call centre operator did write and send me an explanation when I asked for details.

Had I not raised the query that led to the discovery, I may still be unaware that they planned to change the meters.

Having said that, I was told by eON.Next that they would install an appropriate meter once I had my side of the supply sorted, and thanks to the help and advice I've received from yourself and @retrotecchie, I'm confident that the changes will work.

[retrotecchie]

@Kodak

I've had a look at your photos and here's my thinking.

The two existing meters need replacing with a single E7 smart meter. Simples.

The two Henley blocks need to be repurposed to split the output from the meter. That gives the usual Live and Neutral feeds to the existing larger consumer unit. No problem. There seems to be a two pole isolator feeding that second Contactum consumer unit which looks like your heating supply. The unit has been marked with a big red cross in your photo, so I assume that consumer unit is redundant. If so, we're onto a winner.

All the gubbins from there (apart from the RCD on the right) can be replaced. A single 40A MCB for heating and a 6A MCB for control can be fitted in there along with a 63A contactor. If those MCBs already exist, they can be repurposed The heaters are fed from the contactor which is controlled by a Honeywell controller and optional thermostat. Controller is powered from that 6A breaker and the heating demand line controls the input to the contactor.

Because the output from the meter is permanently Live, the heating is available any time of day or night, but obviously you run the heaters for 7 hours on the cheap rate and you can have a boost period whenever you need it on the normal day rate.

Any competent electrician should be able to work it out from my description.

Repurposing the Contactum box and reusing any breakers won't cost anything, a 63A two pole contactor is around £20-30 (like this one), a Honeywell or similar programmer is about £60 and if you need the optional thermostat, add an extra £50. A bit of triple and earth cable to run the controller (Live, Earth, Neutral and Heating Call) and a run of twin and earth for the stat if needed....not a massive job 👍

[Kodak]

@retrotecchie
Thank you for all of your help. It is very much appreciated.

I'll pass your guidance on to my electrician to ensure the setup they install functions correctly, and I'll arrange with eON.Next to have the meters switched once everything is in place.

Your help has lifted a weight from my mind. Thank you.