The ESi Mistral Grey Programmable Wireless Room Thermostat offers unparalleled control and energy efficiency for your home heating system. Its advanced OpenTherm technology intelligently reduces your boiler's flow temperature to help significantly lower gas usage and reduce energy bills.

Compatible with combi boilers, system boilers, heat-only boilers, and heat pumps, this smart thermostat provides versatile control options either directly from the device or through your mobile phone or tablet. With dual-channel operation for both heating and hot water, and flexible programming choices including 7-day, 5-2 day, or 24-hour schedules, you can tailor your heating to fit your lifestyle. Featuring Optimum Start/Stop for maximum efficiency and a convenient boost facility, this thermostat ensures your home is always at a comfortable temperature while being economical.

• Wireless smart thermostat for complete control
• Compatible with various boiler types and heat pumps
• OpenTherm with DHW priority for efficiency
• Control via thermostat, phone, or tablet
• Features Optimum Start/Stop for energy saving
• Hot water time & temp control with ESi cylinder thermostat
• Flexible programming: 7Day, 5-2Day, or 24Hour
• Boost facility and ErP product class 5 certified