You might want to search app-controlled lighting controllers instead of 5-zone heating controllers.
Do you need to have app control of each zone separately? you could choose a few zones to be controlled by something like RT310i - SALUS Controls UK (salus-controls.com) which has an advantage of being able to see the temperature in the church from the phone, it could be wired in parallel to keep existing timers.
You might want to search app-controlled lighting controllers instead of 5-zone heating controllers.
Do you need to have app control of each zone separately? you could choose a few zones to be controlled by something like RT310i - SALUS Controls UK (salus-controls.com) which has an advantage of being able to see the temperature in the church from the phone, it could be wired in parallel to keep existing timers.
