Xylem-McDonnell & Miller 551-S Make-Up Water Feeder 25 PSI 136400

The Xylem-McDonnell & Miller 551-S Makeup Feeder, 25 136400, is a device made exclusively for steam boilers in HVAC systems. It works by automatically replenishing the boiler system with water, sometimes referred to as makeup water, anytime the water level falls below a predetermined threshold. This aids in maintaining steady water levels, which are essential for the safe and effective operation of boilers. A float valve is included in the feeder itself. A valve that lets fresh water into the boiler opens when the float valve lowers due to a drop in water levels. The float valve rises, shutting the valve and halting the flow of water when the water levels reach the specified level. Without human involvement, this mechanical function guarantees a consistent supply of makeup water.