Hi there!
We have a bathroom that has two circuits of underfloor heating and one
towel rail heating. The two control valves for the underfloor system passive ones that are located outside in a cellar. So on cold weather you get hot feet 
I do have 230V in that cellar and thought about using a NSPanel for some lights and music control, so why not temperature control too.
In addition I found these 230V small (wax driven?) control valves. And I have seen some talk about using a shelly to control these.
So, I ordered a 1W “Stellantrieb 230V” and a set of 8A Shelly Blue Gen3.
Question 1)
Is that a good idea, as of long term stability, I expect electronic relays to work better then a mechanical relay clicking a very low load every few minutes?
Question 2)
The radiator and the two floor circuits are three independent regulation circuits. Would that be even manageable? Or does that swing out of control as the circuits are regulating against each other?
Should I try to use one Shelly for the two circuits on the floor or are there easy to combine options in the available Blueprints?
Question 3)
Are there good existing Blueprints or devices that a noob like me can get to work? Or is there a video out there to follow? I got the NSPanel working quite nice by following some stuff on YT.
Thank you