Hello Richard!
Of cause you can. The valves would not open unless the temperature in the room falls below 15 degrees. I turned it off during summer cause the boiler is on always and the temperature does never fall below 20 degrees in summer. It not a difference from the time when we had only manual thermostats. In summer I set all to just do the frost protection. This is even active when turning off Eve Thermo, the frost protection turns on once temperature falls below 10 degrees. This can't be turned off, it is one of the basic functions of Eve Thermo, build in.
Best regards, volker
Apr 28, 2020