Lochinvar & A.O. Smith 100111019 Lower Probe 340155-7026 High-Temperature Durability: Metal construction and

High-Temperature Durability: Metal construction and UL555S compliance make it suitable for critical smoke control and ceiling plenum installations

Always verify the specific system piping and internal check valve requirements before using it in a bi-directional heat pump circuit

Key Benefits for Technicians: Direct OEM Compatibility: Precise fit for Bard wall-mount units

If you notice "swishing" sounds

Positive Seal: The EPDM diaphragm provides a bubble-tight seal and reliable shut-off after pressure release

Lochinvar & A.O. Smith 100111019 Lower Probe 340155-7026 High-Temperature Durability: Metal construction andThe Lochinvar & A. O. Smith 100111019 Lower Probe is a critical OEM replacement temperature sensor designed for commercial high efficiency water heaters. When you are troubleshooting erratic temperature swings or lockout codes on units like the Cyclone BTH, SUF, or HCG series, this immersion style probe is often the primary fix. It provides the central control board with precise thermistor data from the lower section of the tank to manage thermal