Homematic IP Wall Thermostat with Humidity Sensor WTH-3

Keeping indoor temperatures comfortable while managing humidity can be a challenge, especially when you want to save energy. The Homematic IP Wall Thermostat with Humidity Sensor WTH-3 solves this by giving you precise control over your heating and clear insight into your room climate. Mounted on the wall, it measures both temperature and humidity, then uses that data to regulate your radiators or underfloor heating for a consistently pleasant environment.

Who is it for

This thermostat is ideal for homeowners and renters who want smart, energy-efficient heating without complicated installation. It works perfectly in living rooms, bedrooms, or home offices where you need reliable temperature control and want to monitor air moisture to prevent mold or dry air. If you already use Homematic IP devices or plan to build a smart home system, this device integrates seamlessly.

Main features

• Integrated temperature and humidity sensors for accurate climate monitoring
• Large backlit LCD display shows current temperature, humidity, setpoint, and status
• Supports weekly heating schedules with up to 3 configurable heating phases per day
• Boost function for quick warmth, frost protection, party mode, and holiday mode
• Wall-mounted design with screws or adhesive strips – no wiring needed
• Long battery life of up to 2 years with two AAA batteries
• Communicates wirelessly via Homematic IP protocol (868/869 MHz)
• Works with Homematic IP Access Point or CCU3 for remote control and automation

Specifications

• Product type: Smart home wall thermostat
• Communication protocol: Homematic IP
• Radio frequency: 868.0 - 868.6 MHz / 869.4 - 869.65 MHz
• Power supply: 2x AAA 1.5V batteries
• Battery life: Up to 2 years
• Display: LCD with backlight
• Sensors: Temperature, humidity
• Temperature measurement range: 0 to 50 °C
• Temperature accuracy: ±0.5 °C
• Humidity measurement range: 0 to 99 % RH
• Humidity accuracy: ±3 % RH (20-80% RH)
• Setpoint temperature range: 5 to 30 °C
• Control functions: Weekly programs, boost, frost protection, party mode, holiday mode
• Mounting: Wall-mounted (screws or adhesive strips)
• Operating temperature: 0 to 50 °C
• Operating humidity: 5 to 95 % RH (non-condensing)
• Protection class: IP20
• Colour: White (RAL 9010)
• System requirement: Homematic IP Access Point or CCU3 Central Control Unit

Tips

For best results, mount the thermostat on an interior wall at a height of about 1.5 meters, away from direct sunlight, drafts, or heat sources. This ensures accurate temperature readings. Use the holiday mode to save energy while you're away, and the boost function for a quick warm-up when you return. Pair it with Homematic IP radiator thermostats for room-by-room control.