Just in time for the heating season, LEDVANCE has added the second generation of its SMART+ WiFi radiator thermostat to its smart home range. The thermostat connects straight to your router via Wi-Fi (2.4 GHz), so there is no extra gateway to buy. The catch: there is no Matter support and no direct integration with Apple Home. The only platforms LEDVANCE lists are Amazon Alexa and Google Home.
A quick note on the name: in the UK, the thermostat appears on LEDVANCE’s own website as the LEDVANCE SMART+ WiFi Radiator Thermostat Gen2, without the OSRAM name. On Amazon UK, however, it is listed under the OSRAM brand as “Smart+ WiFi Radiator Thermostat Gen2”. It is the same device either way, available as a single pack and a triple pack.
Two control modes: modulating or on/off
You get a choice of how the temperature is controlled. Besides simple two-point control, which just opens or closes the valve, there is proportional (modulating) control. It opens the valve in steps depending on how much heat is needed and should hold your target temperature more precisely. According to LEDVANCE, a stepper motor with high thrust can operate even old, stiff valves with up to 100 N. Adaptive valve control adjusts automatically to your valve, and a limescale protection feature moves the valve at regular intervals.
Schedules, holiday mode and open window detection
In automatic mode, you can set up to six time slots per day or use smart routines instead. There is also a manual mode via the app or the dial on the device, plus a holiday mode that lowers the temperature while you are away. Open window detection closes the valve automatically when you air the room. The SMART+ app (Android 8.0 or iOS 14.0 and later) also shows a history of target and actual temperature and how far the valve is open. An advanced child lock stops anyone from changing the temperature on the dial by accident.
Hardware: display, batteries and fitting
Compared with the first generation, LEDVANCE highlights a brighter display that rotates through 180°, a sturdier housing, improved temperature control and the new history view. The thermostat runs on three AA batteries, which are not included. One set should last a whole heating season, which the product description puts at more than 12 months. When the batteries run low, the device warns you, and you can decide whether the valve should close completely or stay 30 per cent open once they are flat.
It fits valves with an M30×1.5 thread. Four adapters for M28×1.5, Danfoss RA, RAV and RAVL are in the box. After fitting, the thermostat calibrates itself to the valve automatically.
Specifications at a glance
- Type: smart radiator thermostat, battery-powered (3 × AA, not included)
- Wireless: Wi-Fi 2.4 GHz, no gateway needed
- Platforms: Amazon Alexa, Google Home; no Matter, no Apple Home
- Control: modulating or two-point (on/off)
- Schedules: up to 6 time slots per day, holiday mode, eco function
- Connection: M30×1.5, adapters for M28×1.5, Danfoss RA, RAV, RAVL included
- Operation: SMART+ app, dial, rotatable display
- Packs: single pack and triple pack
Availability and how it compares
The thermostat is sold by LEDVANCE as a single pack and a triple pack. In the UK, it is listed on LEDVANCE’s website and on Amazon UK under the OSRAM brand, although the Amazon listing was showing as currently unavailable at the time of writing.
If you want your thermostat in Apple Home directly, you are better off with a Matter over Thread model such as the Meross MTS155, which costs noticeably more. IKEA’s LILJEBAGGE is a budget Matter over Thread option too, but it has only appeared in a few European markets so far and has no confirmed UK release date yet. For an overview of the options, see our guide to the best smart radiator thermostats.
Last updated on 2026-11-14 / affiliate links / images from the Amazon Product Advertising API. Prices shown may have changed since then. All information without guarantee. * = affiliate link: if you order a product through such a link, we receive a commission from the seller. There are no extra costs for you.
Verdict
The second-generation thermostat is a solid Wi-Fi device with modulating control, history data and decent battery life, and it works without a gateway. If you already use Alexa or Google Home, it is an easy way in. If you rely on Matter, Thread or Apple Home, other models will suit you better.
Disclaimer: All product names, logos and brands mentioned in this article are the property of their respective owners and are used for description and information purposes only. All information is based on official press releases and publicly available sources at the time of publication. No guarantee is given for the accuracy, timeliness or completeness of the information.
Related: The best smart radiator thermostats tested · SwitchBot radiator thermostat review · Smart radiator thermostats in our product overview
