Thermostat and valve question

Looeewoo

The installation engineer wasn’t clear about the use of the wireless thermostat In conjunction with the V3+ :# Tado valves.
I have 6 rooms with valves. If I allocate the thermostat to one of those rooms, how does it interact with the valve?

policywonk

Hi.

Would you set out your precise configuration?

• What specific boiler or heat source? What is specifically wired into the heat source to trigger a call for heat and get the pumps going? Is there a wireless receiver present (aka extension kit)?
• Are there motorised zone valves in place? If so, what electrically controls them- Tado wired thermostats?

Wont take long to respond, just need to grasp how they presently fit together.

Looeewoo

The boiler is a Worcester 4000, connected to a Tado wireless receiver and bridge.
Every radiator has a Tado valve, and I have one Tado wireless temp. sensor, that I’m trying to figure out whether I have to/should use.

policywonk

It transpires that the Worcester Bosch 4000 series uses a digital interface which Bosch stil calls EMS-BUS, but it isnt the same version of the EMS BUS that was present in their equipment until 2021. This is an updated protocol and neither the V3 series nor the X series can talk to this version of the EMS-BUS directly.

There is a way around this. In the Netherlands, they made it law that all boiler systems would be required to comply with Opentherm digital controls.

Your options seem to be:

1. Ask Worcester Bosch (WB) for an Opentherm converter which can be reliably controlled by a third party solution, eg Tado V3 and X series. They will complain but they do have a solution and have a legal duty to inform you of it.
2. Talk to Nefit, and ask them for an Opentherm convertor for the WB 4000 series.
3. Ask WB for the Comfort series of wireless thermostats. This means you are tied into them.

Let us know how you get on.

@Emcee Did Tado come up with a relay solution for the 4000 series?

Looeewoo

Thanks for the info. I’ve passed it on to the engineer.