Do the Wiser Radiator Thermostats call for heat?

Yes, Wiser Radiator Thermostats can request heat from the Wiser HubR which instructs the boiler to fire. 

NOTE:  A room Thermostat does not have to be assigned to the same room as the Radiator Thermostat but can be added to improve temperature readings. For more information please see: Does the Wiser Radiator Thermostat measure temperature the same way as a Wiser Room Thermostat?