You could use the trigger from Eve Thermo to switch an Eve Energy reflecting the heat request with the 230 comming from it. But watch out, most boilers cannot handle 230v input and you need to translate to a low voltage potential free contact. For example the right relay. If the heater is only used for central heating you could switch it on off but watch out for sticking pumps in summer. If it is a combi i would use an eve energy and a relay.

Br henkjan
Nov 18, 2021