Lochinvar & A.O. Smith 100274744 Pressure Switch 27″ w.c.

Description

Lochinvar & A.O. Smith 100274744 Pressure Switch 27″ w.c.

This genuine OEM pressure switch from Lochinvar & A.O. Smith is a direct replacement part engineered to maintain safe and efficient operation in compatible boilers and water heaters. Rated at 27″ water column (w.c.), this switch monitors combustion air pressure and ensures the system operates only when proper draft and airflow conditions are confirmed — a critical safety function in modern high-efficiency heating equipment.

Key Features

• Genuine OEM Lochinvar & A.O. Smith replacement part
• Rated set point: 27″ w.c. (water column)
• Monitors combustion air/draft pressure for safe system operation
• Designed for direct drop-in replacement on compatible Lochinvar and A.O. Smith boiler and water heater models
• Helps prevent unsafe ignition under improper draft conditions
• Supports reliable, long-term system performance

Application

The 100274744 pressure switch is designed for use with select Lochinvar and A.O. Smith residential and commercial boilers and water heaters. Always verify compatibility with your specific model number before installation.

Specifications

• SKU / Part Number: 100274744
• Set Point: 27″ w.c.
• Type: Combustion Air Pressure Switch
• Brand: Lochinvar & A.O. Smith