Direct OEM Replacement: Eliminates the need for field modifications

Durable Construction: High-quality encapsulation protects internal copper windings from environmental contaminants and vibration

Common symptoms include a high-pitched whistling noise

While the RS1100 can be hardwired with a 24V AC common wire

Thermal Endurance: Features Class F insulation rated for high-temperature industrial environments

Lochinvar & A.O. Smith 100208407 Switch Els PW 17895 Direct OEM Replacement: Eliminates theThe Lochinvar & A. O. Smith 100208407 Blocked Flue Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a factory authorized replacement for PRS2708 and PRS2708K, this blocked flue pressure switch is calibrated to a specific 55" WC set point to detect dangerous venting restrictions. When flue gases cannot exit the heat exchanger due to obstructions like bird nests, ice, or excessive condensate