Connection between Thision 25 and OTG

[Joks]

Hi,

I want to buy a opentherm gateway but before i have a question about the connexion.
I have a Thision 25 connected to a QAA73.

Can you tell me who i connect the 4 wire to the opentherm gateway?

Here is a photo about then connexion to the Q4473.

Thanks in advance

[hvxl]

On the picture it looks like you connected the blue+white wire on one terminal of the thermostat, and the green+purple wire on the other. I don't know how the wires are connected on the boiler, or where you want to locate the OTGW. But basically you should connect the same combination of wires from the boiler to the connector marked "Boiler" on the OTGW. Then run two wires from the connector marked "Thermostat" to your thermostat. Polarity doesn't matter on either connector.