ThermoSphere Wireless Temperature & Humidity Sensor for BT21

The ThermoSphere Wireless Temperature & Humidity Sensor (model BT21-WTHS) is an optional accessory designed to pair with the ThermoSphere BT21 Bluetooth Programmable Thermostat. It provides accurate ambient temperature and humidity readings from a remote location, ideal for situations where the thermostat is not installed in the same room as the underfloor heating or where more precise control is desired.

Product Features

• Wireless operation—no wiring needed for easy installation
• Designed specifically for use with the ThermoSphere BT21 thermostat
• Measures both ambient temperature and humidity for more precise climate control
• Includes a long-lasting battery with an expected life of approximately 2 years, user-replaceable
• Compact, discreet sensor size for unobtrusive mounting
• Supplied with a silicon wall mount, fixing screws, and double-sided adhesive pad for flexible installation options
• Recommended to be placed within approximately 5 meters of the BT21 thermostat to ensure reliable wireless connection
• Wireless range designed for typical residential wall-to-wall distances
• Easy setup via the BT21 app by scanning the QR code inside the sensor casing

Technical Details

• Model: BT21-WTHS
• Compatibility: ThermoSphere BT21 Bluetooth Programmable Thermostat only
• Wireless Protocol: Proprietary secure wireless link (mesh network compatible)
• Wireless Range: Up to 5 meters recommended for stable connection
• Power Source: Replaceable battery (included) with expected 2-year life
• Sensor Type: Ambient temperature and relative humidity
• Dimensions: Approx. 55mm x 15mm x 15mm
• Mounting Options: Silicon wall mount, screws, or adhesive pad
• Operating Temperature Range: Typical indoor ambient conditions suitable

Other Details

• Ideal for rooms where the thermostat is installed away from the heating zone for more accurate ambient measurements
• Helps improve heating system efficiency by monitoring humidity and ambient temperature remotely
• Installation guidelines recommend testing wireless signal strength before permanently mounting
• Battery replacement instructions included in the packaging

Why Choose the ThermoSphere Wireless Temperature & Humidity Sensor?

This wireless sensor extension enhances the functionality of the BT21 thermostat by providing precise, remote ambient temperature and humidity data. It enables smarter heating control, increasing comfort and energy efficiency, especially in multi-room installations or where the thermostat location is not ideal for sensing the actual room conditions.