I integrated my electirc heater in evohome see this post
What you need is:
A seperate thermostate of the evohome system (I chose the T87RF2025 Round Wireless, also lots available 2nd hand)
A power plug (you already have the fibaro) of the homey system to control the heating
Now you can control (and program) the heater from your evohome app!
(Did not test it but I expect it is even using the smart heating function of evohome) So you just program the desired time in evohome and it will learn when to start heating.
And on top of that you can create flows in homey to control the heating too (via evohome or directly controlling the plug.
(Check the app store for heater controllers)
Best thing of all: huge WAF (Wife Acceptance Factor)
