Honeywell Home evohome THR99C3102 - 12-Zone Heating Control
Published on 09/22/2026 at 15:10 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Honeywell Home evohome Starter Set THR99C3102 is a wireless zonal heating package built around a touchscreen controller and two electronic radiator thermostats. The system is designed for room-by-room heating control rather than one temperature setting for an entire home.
What The Starter Set Includes
The THR99C3102 package includes a central control unit, two AA HR6 Ni-MH rechargeable batteries, a table stand, a power supply, and two THR092HRT electronic radiator thermostats. The documented system setting range is 5 °C to 35 °C, with measurement accuracy of 0.5 °C.
The controller uses a backlit display, while wireless radiator heads regulate individual rooms. A technical data sheet lists the controller at 139 x 101 x 21 mm and identifies a wireless range of up to 30 m in an open field. The starter set uses a weekly programming format for scheduled temperature changes.
How The Zoning Works
evohome can independently control up to 12 heating or cooling zones and one hot-water zone. The system builder also supports radiator circuits, underfloor heating arrangements, heat pumps, and zone valves when the rest of the installation contains compatible control hardware.
The radiator controllers require compatible thermostatic radiator valves. Documentation lists M30 x 1.5 connections and adapters for selected M28 x 1.5 and Danfoss RA valves. The controller connects through 2.4 GHz Wi-Fi, while remote control and smart-home integrations depend on an internet connection and the selected system configuration.
Honeywell Home evohome Smart Heating Overview
Resideo's evohome system builder shows the supported zoning architecture and connected heating options.
Limits And Compatibility
The THR99C3102 is a heating-control system, not a standalone room thermostat. Its value depends on compatible radiator valves, a suitable boiler or heating circuit, relay hardware, and installation conditions.
Compared with a single-zone smart thermostat, evohome offers more granular control but requires more components. The documented 12-zone capacity is the clearest distinction: one controller can coordinate separate room zones, while a basic single-zone setup regulates from one reference point.
Who It Fits Best
THR99C3102 fits radiator-based homes and small offices that need scheduled room-level control. The 5 °C to 35 °C setting range, weekly programming, wireless radiator heads, and app connectivity support systems where different rooms follow different heating schedules.
The package is less suitable for installations without compatible thermostatic radiator valves or for properties that use only a central air handler without room-level heating circuits. The 2.4 GHz Wi-Fi requirement also applies to connected functions, while some local controls continue to operate without internet access.
Honeywell Home evohome THR99C3102
- Product: Honeywell Home evohome Starter Set THR99C3102
- Manufacturer: Resideo Technologies, Inc.
- Category: Wireless zonal heating control system
- Heating zones: Up to 12 zones
- Setting range: 5 °C to 35 °C
- Measurement accuracy: 0.5 °C
- Controller dimensions: 139 x 101 x 21 mm
- Wireless range: Up to 30 m in open field
- Target audience: Homes and small offices with compatible radiator heating
