Vaillant ecotec plus 835 & evohome & opentherm compatible?

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Then as usual you are talking Boolox about things you know nothing about.

Neither are relays.

Wireless Receiver for OpenTherm® appliances.

Which will have a relay contact or ( most unlikely ) a solid state switch to complete a circuit when there is a need for the boiler to do something.

EDIT or maybe they have a serial data link to a data port on the boiler to provide for more control functions than just the simple boiler on / boiler off that a single relay contact can provide. That would seem a bit over the top for a domestic heating system.
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