McDonnell & Miller WFE-120V Water Feeder

The McDonnell & Miller WFE-120V Water Feeder (Part Number 169560) is a heavy-duty 120Vac electronic water feeder designed for professional-grade steam boiler and hot water boiler management. Engineered as a universal Uni-Match feeder, this unit integrates seamlessly with both probe-type and float-type low water cut-offs (LWCO). It is a critical component for maintaining a safe water level, effectively preventing dry fire conditions by monitoring the normal operating water level (NWL) and adding water only when the LWCO signals a deficiency.

This model features field-adjustable dwell-feed cycles, allowing technicians to customize delay and feed timings to match specific system requirements and prevent boiler overfilling caused by lagging condensate return. The 1/2" sweat adapters and 3/8" NPT connections simplify installation into existing wet return lines. With a 2 GPM standard feed rate (adjustable to 1 or 4 GPM via included orifices) and a maximum water pressure of 150 psi, the WFE-120 provides high-torque performance for residential and light commercial hydronic systems.

• Universal Compatibility: Works with all major electronic and mechanical LWCOs for maximum versatility on the job site.
• Selectable Dwell-Feed Cycles: Prevents short-cycling and flooding by allowing condensate to return before the feed cycle begins.
• Manual Feed Override: Includes a front-mounted manual feed button and multi-color LED status indicators for immediate system diagnostics.
• Integrated Protection: Features a hard-stop limit to minimize flooding risks and a removable internal strainer to protect the valve from sediment and pipe scale.

Common Questions

Is this feeder compatible with older float-style low water cut-offs?
Yes, the Uni-Match technology is specifically designed to interface with both modern probe-style and traditional float-style mechanical controls, provided they operate on 120V.

How do I prevent the boiler from overfilling during the feed cycle?
The WFE-120V utilizes adjustable dip switches to set dwell times. Increasing the dwell time ensures all steam condensate has returned to the boiler before the unit adds supplemental water.

What is the maximum pressure rating for this water feeder?
The unit handles water supply pressures up to 150 psi, while the maximum boiler pressure should not exceed 15 psi for standard low-pressure steam applications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.