Aquastato Honeywell L6191B2005U

Aquastat Honeywell L6191B2005U Dual immersion aquastat with manual reset for precise control and limit protection of boilers and water heaters. Aquastat Honeywell L6191B2005U (Aquastat) is a specialized dual immersion thermostat combining two independent functional modules in one housing: a temperature controller (SPDT) and a safety limit with manual reset. Both liquid-filled sensors are installed in a common immersion stem and are designed for direct mounting in boilers, water heaters, and other water tanks. The device ensures accurate maintenance of the set temperature and reliable protection of equipment from overheating. If your heating or hot water system operates intermittently, does not reach the required temperature, or frequently shuts down in emergency, the cause may be a faulty standard aquastat. Technical specifications Parameter Value Part numbers L6191B2005U, 534.109.018 Manufacturer Honeywell Mounting type Immersion (with common stem) Sensor type Liquid, two independent Working medium Water Module 1 — Control Thermostat | | Switch type | SPDT | | Adjustment | External knob | Module 2 — Limit Thermostat | | Reset type | Manual Reset | | Adjustment | Internal screw | General characteristics | | Electrical load (resistive) | 10 A at 250 V AC | | Electrical load (inductive) | 2.5 A at 250 V AC | | Electrical load (locked rotor) | 15 A at 250 V AC | | Protection class | IP40 | Key advantages Two independent sensors in one housing: The design combines a controller and a safety limit with manual reset. This saves installation space and simplifies the wiring diagram, as it does not require installing two separate devices. Reliable protection against