Bosch Smart Home Radiator Thermostat II, smart radiator thermostat

Bosch Smart Home Radiator Thermostat II - 135 g and Zigbee 3.0

Published on 09/23/2026 at 17:59 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Bosch Smart Home Radiator Thermostat II measures 51 x 51 x 87 mm and weighs 135 g without batteries. It uses Zigbee 3.0 for Bosch Smart Home control.

Fotorealistische Studioansicht von Heizkoerperthermostat in neutraler Produktdarstellung — Fotorealistische Studioaufnahme von Heizkoerperthermostat zum Thema Bosch Smart Home Heizkörper-Thermostat, klare Lichtfuehrung, Illustration mit AI erstellt.

Bosch Smart Home Radiator Thermostat II is a battery-powered smart radiator valve with a compact 51 x 51 x 87 mm housing. The device controls a radiator valve through Bosch Smart Home and uses two AA batteries for power.

Compact Radiator Control

The thermostat weighs 135 g without batteries and uses an M30 x 1.5 mm valve connection. Its IP20 protection rating and 0 C to 50 C ambient operating range place it in the indoor heating-control category.

Bosch specifies a 2.4 to 2.4835 GHz radio band, Zigbee 3.0 communication, and a maximum transmission power of 3 mW in the BTH-RAD technical documentation. The stated open-field radio range is less than 50 m.

Smart Home Compatibility

The original Radiator Thermostat II uses Zigbee 3.0 and requires a compatible Bosch Smart Home Controller for app-based system control. Bosch lists the device as part of a heating system that supports scheduled temperature settings and radiator valve regulation.

The newer Radiator Thermostat II [+M] uses the model number 8750002861 and adds Matter compatibility through Thread. An independent product listing identifies the [+M] release date as September 24, 2024, and lists Matter and Zigbee as its communication standards.

Best Fit for Bosch Systems

This thermostat fits users with compatible radiator valves and an existing Bosch Smart Home setup. The 135 g housing, two-AA power supply, and M30 x 1.5 mm connection keep the hardware focused on individual radiator control rather than whole-home heating management.

Compared with a basic manual radiator knob, the Bosch device adds app-based scheduling and smart-home integration. Compared with the [+M] model, the original BTH-RA version relies on Zigbee, while the newer 8750002861 model adds Matter and Thread support.

Technical Verdict

Bosch Smart Home Radiator Thermostat II is a compact Zigbee radiator thermostat for Bosch Smart Home installations. Its main limits are the need for a compatible controller, indoor-only IP20 protection, and a valve fit based on M30 x 1.5 mm or the supplied adapters.