McDonnell & Miller 25AHD Water Feeder Head MechanismIntroducing the McDonnell & Miller 25AHD Water Feeder Head Mechanism, a precise and dependable solution for boiler feed control. This robust head delivers reliable performance in demanding applications and supports long service life across seasons and equipment. Used On 25 A Series Water Feeder units, this Type Head Mechanism integrates seamlessly with existing boiler feed systems, delivering consistent performance and minimal maintenance. With a

Air Connections 5/32" OD dual barb

This SPDT snap switch provides reliable control across heating

this valve runs on 24 VAC at 60 Hz and tolerates -40 to 175°F

230V electrical operation

responsive airflow

providing steady air flow to support combustion and venting

With reliable test and status features

Temperature ratings: Copper tube rated to 640°F

3 standards for dependable performance

engineered for precise hydronic control in radiant heating

24V control operation for compatible HVAC controllers

Air Pressure Sensing Switch from Cleveland