Starting a flow when the time is equal to the value of a variable

[Torch1969]

Or the app Heating controller, which also can switch devices (heating, but not necessarily) on or off based on dynamic prices.

[APP][Pro] Heating Controller with utility prices

The ‘Heating Controller’ is a device for easily controlling temperatures and modes for thermostats and sockets for heating. To switch between ‘Comfort’ and ‘ECO’ modes, just two flows are necessary: one ‘Comfort’ flow with comfort temperatures and modes, and one ‘ECO’ flow with ECO temperatures and modes. Each ‘HeatingController’ device has its own schedule that can be changed from ‘Advanced settings’. Several devices can be used, each with their own schedule. The app has support for public…