Shelly 1 connected in parallel with original thermostat

Hi Guys

this is probably more of a general electrical question. I want to add automation control to my underfloor heating. There is currently a thermostat installed. I would like to install the shelly 1 in parallel to the existing thermostat so that the floor can be controlled by both. In my head this sounds like it just means that I effectively have two switches between the power source and the load. I just wanted to make sure that im not creating some sort of short / loop when both the thermostat and the shelly 1 are on at the same time ?

im imagining that i would split the live and neutral wires so that they feed into both the thermostat and shelly 1 in parallel, then i would wire the output's of both the thermostat and shelly 1 to the underfloor heating wires.

Hi Stefan

Thanks for responding. They are heating mats installed under the carpets. No centralised, i believe the thermostat simply turns the heating mats on or off. Thermostat turns it on when air temperature drops below temp setting and turns off when temperature reaches temp setting.

I've added a screenshot from the thermostat manual.

thank you, could you point me to an example of a switching relay? not familiar with these.