ESI WIFI Smart Wireless Programmable Room Thermostat Heating & Water ESRTP6WHW-G\nIn gunmetal grey our 6 series smart room thermostat is perfect for use with combi boilers, as well as system & heat only boilers and can control both heating and hot water from your device or via Alexa for added convenience and energy savings.\nEquipped with OpenTherm communication to regulate your boiler flow temperature correctly, the 6 series is your choice to help save energy and reduce costs.\n--Opentherm communication which can save up to 15% gas when connected to an Opentherm compliant boiler\n--A true Smart thermostat which combines both automation and optimisation features to reduce gas use\n--Control one heating zone and hot water via an ESi WiFi or traditional cylinder thermostat\n--Simple and quick to install with RF connectivity reducing the need to run cables through the property\n--Control via device or Alexa from anywhere saving money by not heating an empty house\n--Holiday modey