http://www.vesternet.com/z-wave-eurotronic-spirit-smart-radiator-thermostat?utm_campaign=Latest+Products+28%2F10%2F2017++%28KXkf7Q%29&utm_medium=email&_ke=dmVzdGVybmV0QG1kaG9tZS5uZXQ%3D&utm_source=Everyone+in+account
@Autolog first noticed these on the horizon and now they are here at £57 each.
Interesting because they use FLiRS - i.e. realtime control (Frequently Listening Receiver Slave) which I believe means that even though it is battery operated it is capable of responding to device changes instantly.
Makes dynamic control of a rooms temperature closer to reality.
i.e., under Indigo, a motion detector sees someone in the room, Indigo can instruct the TRV to switch from a 17C maintenance to 20C inhabit mode.
It really opens up lots of possibility.
Also the price looks good.
When budget allows I'll get a few and report back.