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For my Remeha Calenta I have the iSense controller. The iSense has an external input which, when closed, sets the heating to a certain setpoint.
The problem I have is the fact that the iSense is on a wall in the living, without any power outlets nearby. Because I would like to use this external input
i need some sort of 433 device (kaku??) which is battery powered, and is able to close this external input. (simple 2 wire open-close)

Does anyone has an idea to create some sort of sollution for this? All the kaku devices I can find are powered by a outlet.

Regards

Use a JeeNode and a relais.

That's what I thought too; and maybe you can 'steal' the required power from the iSense, which gets the power from the Calenta..

Arent there any spare wires in the cable from the iSense to the Calenta? Then you could use any relais near the Calenta ( like the fibaro zwave relais).

I believe there are some spare wires. It would be a good option using these from another location! Will check this out!