Electric or wet?
If electric then a wired smart thermostat is only able to switch loads up to 3A which would be a small floor area. You can use a contactor (relay) to switch the floor load and Tado will control the contactor but you still need a separate floor thermostat to avoid the floor overheating so it's a messy set up
If it's wet, then I assume there is a motorised valve to control flow to the floor? In that case, a wired smart thermostat will be able trigger the valve. The smart thermostat should be a straight swap for your existing one