In my house I have 3 circuits of floor heating elements, each is connected to single phase (230V) 16A fuse and on one of them I have Heatit Z-TRM3 connected via z-wave to my home assistant. Others are manually controlled dumb thermostats.

That thing works, but at least the particular one I got causes a lot of interference to the z-wave network, so I’m a bit hesistant to add any more of those.

Features I must have:

• Option for a floor temperature sensor. Each thermostat has separate pipe going to the floor and the floor sensor is easy enough to replace, but it is a must have option
• Air temperature sensor. 2/3 of the heating elements are in a concrete slab and that means that measured temperature of the slab very slowly affects the air temperature, so I need both. ESP32 or equivalent as a separate sensor might be a decent workaround, but I’d rather have both on a single unit.
• Obviously the 230V 16A capability as that’s what they’re wired on and even if I don’t have 3kW elements on the floor it’s what’s needed to meet the code
• Manual controls on the device itself. Should my raspberry pi running home assistant kick the bucket or some other major issue with the automations happens, I still need an option to control the device. And that’s a strict requirement, no bluetooth apps on the phone or anything, I must have manual buttons or some other way to control the thing without home assistant or any other smart device.
• And addition to previous one: No cloud requirement. Allowing the device to the internet for a setup is fine, but in the long run it must be happy in a isolated network without internet connectivity

For the communication I don’t really care. I currently have only wifi/z-wave as an option, but if there’s something on zigbee which ticks all the boxes I can invest in a usb-dongle or a hub.

Price is obviously a concern, but it’s hard to set any strict boundaries. I won’t throw a 1000€ for a thermostat, but anything even remotely reasonable goes.

What are your suggestions for a situation like this?