Hi There,
I currently have an unbranded "ZL-2061-01" fitted: https://theunderfloorheatingsite.co.uk/shop/thermostats-controls/water-underfloor-heating-thermostats/water-underfloor-heating-thermostat-programmable-3-amp-room-stat-with-air-sensor-in-white/
It has 3 wires
I'm replacing this...