Can this product also be fitted in the house down in the basement on the manifold by the actuators to control the underfloor heating? I would like to attach a product like this to each controller and install a Shelly Thermo Display in every room, or do you have a better suggestion?

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I did it exactly the same way. They work perfectly. Automated via Home Assistant and a few Aqara HT sensors on the floor in the respective rooms as actual values. Temperature/time programme in HA directly with fixed and presence detection. Easy
By "Shelly Thermo Display" do you mean the "Shelly Wall Display"? Flush-mounted rather difficult as rarely in the right place (eye level). Quite expensive, especially if you need several of them. Then it's better to go straight for a Home Assistant Yellow or something else and you're completely free.

Answer

If the connection/valve for the manifold fits and WLAN reception is available, then yes. It is possible to receive the temperature from an external sensor (e.g. Shelly Plus H&T) via Rest Service Call. If this is not accurate enough, you can also set the valve position directly via a home automation system (e.g. Home Assistant, OpenHAB, etc.) and completely dispense with Shelly's automatic control.

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Question about Shelly Trv

Can this product also be fitted in the house down in the basement on the manifold by the actuators to control the underfloor heating? I would like to attach a product like this to each controller and install a Shelly Thermo Display in every room, or do you have a better suggestion?