tado° Smart Thermostat X - Starter Kit (Wired) & Bridge. X Review (2026)

The tado° Smart Thermostat X Starter Kit is designed to replace existing wired room thermostats, connecting directly to the boiler or zone valve. This 'X' generation marks a significant shift for the brand, moving away from their proprietary bridge toward the Matter over Thread standard. The kit includes the wired thermostat and the Bridge X, allowing for app-based control and integration with Apple Home, Alexa, and Google Assistant. Its minimalist LED display provides clear temperature readings and manual override capabilities.

In a typical UK home, the tado° X proves highly responsive due to the Thread protocol, virtually eliminating the lag sometimes seen in older Zigbee or Wi-Fi setups. The scheduling is intuitive, and the app's 'Air Comfort' feature provides useful insights into indoor air quality. However, users should note that the 'X' range is not backwards compatible with the previous V3+ hardware, meaning you cannot mix and match generations within the same system.

Realistic savings depend heavily on your existing heating habits. For a draughty UK semi-detached home previously using a manual dial thermostat, upgrading to tado° could shave 10-15% off annual gas bills (roughly £120-£180 at current price caps) through tighter scheduling and geofencing. However, the 'Auto-Assist' feature, which fully automates geofencing and open-window detection, requires a monthly subscription, which eats into your first-year ROI.

Designed for DIY replacement of existing wired thermostats. It uses the standard UK backplate footprint, though checking boiler compatibility via tado's online guide is essential before purchasing. The new Thread-based commissioning is generally faster than previous versions.

The hardware is purely battery or mains powered with negligible draw. The hidden cost is the optional 'Auto-Assist' subscription (£24.99/year or £2.99/month), which is necessary for fully automated energy-saving features.