Weil McLain 640-000-019 Water Pressure Switch W/Mount Combi

The Weil McLain 640-000-019 Water Pressure Switch with Mount is a replacement safety and monitoring component designed for compatible combi boilers and hydronic heating systems. It works by continuously sensing water pressure within the system and signaling the control board when pressure levels fall outside the required operating range. This helps protect critical boiler components from damage caused by low water conditions. Ideal for residential and light commercial HVAC applications, the switch enhances system safety, supports reliable performance, reduces maintenance issues, and helps maintain efficient heating operation.