This external sensor is an optional accessorie for Heat-it thermostats.
Heatit Z-Temp2 is a temperature sensor designed for use with water-based heating systems.
Heatit Z-TRM3 is an electronic Z-Wave wireless technology thermostat for electric underfloor heating, designed to be mounted in a standard wallbox.
Module for installation on DIN rail, Z-Wave + technology for the control of hydraulic heating up to 10 outputs. Heatit Z-Water is a DIN rail mounted controller for controlling hydronic heating.