I think you are definitely right, I’ll correct the first post.
@rrooggiieerr No, I think it is neither BLE nor Bluetooth! The correct brand name is eQ-3 Max!, btw. It uses a proprietary protocol transmitted in the 868 MHz SRD band. See also - http://www.eq-3.com/products/max/max-radiator-solution.html
BLE (Bluetooth Low Energy, aka. Bluetooth Smart) is just a variant of the Bluetooth protocol. Bluetooth runs on 2.4 Ghz.
eq-3 also provides Bluetooth Smart (= BLE) thermostats sold under “eqiva” brand. These products are stand-alone devices, meaning that they are operated independently of the MAX!, Homematic or Homematic IP systems. See also http://www.eq-3.com/products/eqiva.html
Following this, it does not make much sense to have Bluetooth thermostats for use with pimatic unless you plan to have a bluetooth gateway in each room of the house.
EDIT: Note beyond, eq-3 also offers “Homematic” and “Homematic IP” thermostats. These products also run on 868 Mhz while “Homematic IP” is the more recent protocol variant which includes 128-bit AES encryption and IPv6 device addressing. In other words each thermostat has an IPv6 address rather than using a proprietary addressing scheme.