Genius will be able to control your boiler if the boiler can be controlled by either a switched live or a volt free contact on the thermostat terminals of the boiler.
Here is a link to our wiring diagrams.
You just need to check with your boiler manufacturer that. If the boiler can be controlled by a 3rd party thermostat that uses the switched live or a volt free contact.
Please confirm with us the make and model of your boiler if you cannot find it on our boiler compatibility checker.