Thermostat Boost Mode

[Dilski]

Hello.

my home heating setup uses Zigbee TRVs (the Sonoff TRVZB) with a main thermostat (Sonoff NSPanel running NSPanel_HA_Blueprint).

In my system:

• The TRVs report when they’re actively trying to heat
• The main thermostat controls the boiler that actually heats.

My problem is that right now if a TRV is requesting heat, I have an automation to set the setpoint on the thermostat to something high to trigger the heating - but would like to be able to request heat without changing the setpoint/thermostat mode.

I have considered doing something like switching on the relays directly, but am concerned that if my home assistant instance died then the relay may just stay on. Is it possible to (for example) have a virtual button which will turn on the relay for 5 minutes and then revert to whatever it was before (unless it's "pressed" again) - like how some other thermostats work?

Any guidance would be appreciated, thank you
Dill