Thermostat COMFORT WT-20 (radio) + smartphone app (Wi-Fi) 3ZTERWT20W

Control your heating from your phone — no wires, no complications

The COMFORT WT-20 thermostat combines the simplicity of physical control with the intelligence of a smartphone app. You don’t need to reach for a manual regulator — just open the dedicated app to change the temperature, check heating status, or activate vacation mode, even when you’re away from home. This isn’t just convenient — it’s efficient. You reduce costs because heating operates only when needed.

The built-in sensor measures air temperature accurately — with ±0.5°C precision — and is unaffected by radiant heat from the boiler or sunlight. The receiver connected to the boiler receives signals via 868 MHz frequency, while Wi-Fi connectivity allows configuration from anywhere in the house. You don’t need to be near the device to operate it.

Open window mode — intelligent savings

When you open a window briefly to ventilate the room, the thermostat knows. It detects a sudden temperature drop (2°C within 15 minutes) and automatically shuts off heating. You don’t waste energy heating air that escapes outside. After 30 minutes, the system automatically resumes its schedule — but if you want to restore heating sooner, simply press any button. This isn’t just a “nice feature” — it’s sensible operation.

Installation like LEGO blocks

No electrical work is required for the thermostat. It’s powered via micro-USB (a charger is included in the set), so you can place it on a shelf, mount it on the wall, or move it to another room without any wiring. Connect the receiver to the boiler like any standard relay — 230V, max 10A. Everything operates safely: the ABS casing has IP20 protection rating, and it carries CE, ROHS, and RED certifications — no “clever” solutions from Chinese manufacturers here.

The display is large and backlit — you can clearly see the set and actual temperature, time, and day of the week even in low light. The glass cover not only looks elegant — it protects the buttons from dust and moisture. Program four daily cycles across seven days: comfortable temperature in the morning, economical during the day, warm again in the evening. No need to remember to turn it on manually.

There are no “magic” features here. Nor are there empty marketing phrases like “the best solution.” There’s just one simple tool: a proven sensor, a reliable receiver, and an app that works without issues.