always check the parts list for your specific cabinet before installation

As a modulating zone valve

and GDHE 50 Series

Short cycling is often a symptom of restricted airflow

It is often identified by the CPW 502-752 designation on the existing module

Lochinvar & A.O. Smith 100208309 Nylon Brush 322838-754 always check the parts listThe Lochinvar & A. O. Smith 100208309 Nylon Brush is an essential OEM maintenance tool engineered for cleaning heat exchanger surfaces in high efficiency boilers and commercial water heaters. As a veteran tech, you know that soot and mineral scale buildup act as progressive insulators, driving down thermal efficiency and increasing flue gas temperatures. This HVAC heat exchanger cleaning brush features high resilience nylon bristles designed to