This 1822S black 22S 3A hydronic thermostat is a wired non-WiFi temperature controller specially designed for water floor heating and hot water boiler systems, without wireless module to deliver stable offline operation and lower failure risk. It matches 3A rated load to drive water heating actuators steadily, equipped with high-precision NTC sensor for accurate room temperature detection. The sleek black matte panel fits most indoor decoration styles, with clear digital display and physical buttons for easy temperature setting and weekly timing programming. Built-in multi-layer safety protections include anti-freeze mode, overheat cut-off, sensor error alarm and child lock to prevent misoperation. Standard 86-type wall-mounted structure supports simple installation, anti-interference internal circuit ensures long-term continuous running. Ideal for apartments, villas, hotels and residences without remote control demand. Reliable constant temperature performance and favorable factory wholesale price, a necessary matching control part for heating equipment distributors worldwide.