Radiator Thermostats & TRVs | Manual and Smart Thermostatic Radiator Valves

About

A thermostatic radiator valve — or TRV — is one of the simplest and most cost-effective upgrades you can make to a wet central heating system. Fitted in place of a standard radiator valve, a TRV controls the flow of hot water into each individual radiator based on the temperature of the room around it. When the room reaches your desired temperature, the valve closes and stops the radiator heating further. When it cools down, it opens again. The result is that each room maintains a comfortable, consistent temperature without you having to manually adjust anything — and without wasting energy heating rooms that are already warm enough. Manual TRVs vs Smart TRVs — What's the Difference? A manual TRV has a numbered dial (typically 1–5) that you set once and leave. It's mechanical, battery-free, and entirely self-contained. These are a reliable, no-fuss option that suit most homeowners and are perfect for rooms that tend to stay at a predictable temperature. Our Reina Modal range covers this category, available in a wide range of finishes including chrome, anthracite, black, white, brushed, and bronze — in straight, angled, and corner configurations to suit any radiator installation. A smart TRV replaces the manual head with a programmable, app-controlled or wireless unit that gives you precise scheduling, remote control via your phone, and often integration with your wider smart heating system. These are ideal if you want room-by-room control from anywhere, want to set heating schedules per room, or are building out a multi-zone smart heating setup. Our smart range includes options from Hive , Honeywell Evohome , Salus iT600 , EPH Ember , and ENGO Controls — each compatible with their respective smart heating ecosystems. What to Check Before Buying The most important compatibility consideration is the valve body connection size — most UK radiators use an M30 × 1.5mm thread, which is the most common standard, but some older radiators (particularly those with Danfoss RA-t