Hello Max - One solution that’s being discussed in there more and more is ‘MAX!’ from German manufacturer ‘eQ-3′. A system of inexpensive components including wireless battery operated TRV’s that easily retro-fit to your existing radiators without the need for a plumber, or to drain your system. Once MAX! is installed, it will control each radiators motorised valve individually, creating a zoned heating system with higher efficiency and in turn reduced bills.
Via Vincent Demay