maintaining the correct water column is critical for downstream equipment performance and system stability

Efficient Retrofitting: Allows for quick sensor replacement without draining the system or replacing the entire well

the York S1-025-26392-704 serves as a direct OEM replacement limit switch for several residential and commercial configurations

042 burner orifice ensures your unit operates at the manufacturer’s specified thermal capacity

Berko 4520-2048-000 Limit Switch maintaining the correct water columnThe Berko 4520 2048 000 is an OEM 135F CO Auto Limit Switch designed for high performance thermal regulation in Marley Engineered Products and QMark 900 Series B heating systems. This 2 pole limit switch operates with an automatic reset mechanism, functioning as a critical safety component that opens on temperature rise to prevent overheating. Engineered for HVACR technical specifications, it features a single pole single throw (SPST) switch action,