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Can I keep my ESi wiring centre with Drayton Wiser Kit 3?

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30 Nov 2025
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Hi,

I've got a new-build house from 2018 that has an S-plan system with 2 heating zones and separate hot water.

From new:

- The gas boiler is an Ideal Logic Heat H15
- The programmer is an ESi ES3247B, which is on the wall close to the gas boiler
- Both upstairs and downstairs there is an ESi ESRTD3 wired thermostat
- All zone valves / programmer / stats / etc are wired into an ESi ESWCPCB3CB wiring centre mounted on the hot water cylinder
- Each room has a radiator and every radiator has a Mason TRV 2 Way (except each zone has 1 pass-through radiator with no TRV)

I've tried swapping the programmer out for a Drayton Wiser 3-channel with wireless thermostats, as the lack of any smart / remote / flexible control with the ESi stuff is just not working for us. Ideally, I really want to be able to heat rooms more independently with Smart TRVs, but even just being able to control the stuff without having to physically walk over to the wall would be a start.

The heating control for the Wiser works as expected - when the Wiser says heat, it heats and turns off when instructed also.

The issue I faced is that only the wired ESi thermostats are able to turn their heating zone on/off (e.g. temp higher than recorded temp) and it doesn't matter whether the Wiser zone says to heat or not (so if the ESi CH1 stat says ON, the heating is on for that zone, regardless of whether the Wiser says ON/OFF for that heating zone). I first tried removing the wired stats and capping-off the wires with WAGO 221’s, but that with hindsight just created a permanent "off" scenario.

Is anyone aware with the ESi ESWCPCB3CB whether there's any way to keep this but bypass the wired stats e.g. only when Wiser says CH1 ON or CH2 ON should that zone heat? Or is it just an inherent "feature" of this ESi wiring centre PCB that you must have wired stats, or how it’s been wired? Or do I need to bite the bullet and get this replaced with something a bit more flexible?

The wiring centre is a bit messy so it's hard to make some stuff out, but here's a picture of it and also a picture of the schematics from ESi.

I can send some specific pics if helpful. Thanks in advance!
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Last edited:
What I didn’t try yet was unplugging the room starts completely from the wiring centre. I’m not sure if them being plugged in is somehow creating an override from what the ESi or Wiser programmer says. It seems like the programmer heating zone schedules get ignored, as when you turn the room thermostat up, it has always called for heat regardless of what the programmer schedules are.

I rolled everything back so was hoping someone may have some insights before I try anything again?
 

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