Floor heating control

What do you use to control floor heating? I bought a

R4DCB08 8-channel RS485 DS18B20 Sensor Board MODBUS RTU, but the temperature value every now and then drop down to 0°C and I don´t know why. And for the valves DANFOSS ‑ Z‑Wave Hydronic Controller HC5, didn´t get that one to work either. So I am looking för a better solusion.