Hydronic Low Water Cutoff Mechanical Control Model 61 for Low-Pressure Steam 20 PSI Max MM-140100

The Hydronic Low Water Cutoff Mechanical Control Model 61 for Low-Pressure Steam 20 PSI Max (MM-140100) provides burner shutdown protection for low-pressure steam boiler systems using a float-activated sensing chamber and dual-switch design for safety and auxiliary circuits. Built for systems operating up to 20 psi, this LWCO uses 1 inch NPT equalizing piping connections to maintain proper chamber communication and reliable water-level monitoring. Technicians choose this model for residential or light commercial steam applications requiring dependable, mechanical low-water protection, straightforward service access, and long-term operational safety.