and 243-SR models where a robust 1-piece clamp is required for the upper housing assembly

What is the difference between the A19AAC-63 and the A19AAC-63C

eliminating the need for complex field assembly or component balancing

This 2-stage natural gas valve provides the throttle control and electrical reliability your clients expect during peak heating cycles

Advanced Security Logic: 3-level PIN-protected keypad lockout ensures system setpoints remain consistent in public or commercial spaces

Lochinvar & A.O. Smith 100110783 Pressure Switch 321894-706 and 243-SR models where aThe Lochinvar & A. O. Smith 100110783 Pressure Switch is a critical safety component engineered for high efficiency commercial and residential boilers and water heating systems. As a blocked inlet pressure switch, this OEM replacement part is calibrated to monitor airflow and combustion exhaust conditions. If the venting system becomes obstructed or the inducer motor fails to maintain the required pressure differential, this switch breaks the