This 3A non-WiFi digital thermostat is specially matched for 22L space heaters, supporting standard AC220V power input without wireless module for stable offline operation. Built-in high-sensitivity NTC sensor delivers accurate real-time temperature monitoring, with intuitive physical buttons for quick target temperature setting and one-key reset function. It adopts 3A relay load design to perfectly drive 22L heating equipment, equipped with multi-layer safety protections including overheat alarm, sensor failure reminder and power delay startup to avoid heater damage. Without WiFi circuit, it lowers failure rate and production cost, more suitable for basic heating scenarios without remote control demand. Compact lightweight ABS housing fits easy installation inside 22L furnace heaters, anti-interference internal circuit supports long-term continuous work. Widely applied to household portable heaters, small indoor heating furnaces and commercial mini warm air machines. Stable constant temperature performance and favorable wholesale price, essential matching control part for heater manufacturers and hardware distributors worldwide.