High Discharge Capacity: Rated at 2

Direct Fit Compatibility: Specifically engineered to replace obsolete York part numbers S1-024-21670-001 and S1-024-26044-000 without mounting modifications

Methane (CH4) calibration gas at a specific concentration (usually 50% LEL) is required to zero and span the E3SRMM catalytic bead sensor during routine inspections

Ensure your HVAC ventilation safety protocols are met by installing this factory-specified component to maintain precise boiler pressure regulation performance

Its durable construction is intended to withstand the high-cycle demands of residential heating applications

McDonnell & Miller 101A Water Feeder R-410A High Discharge Capacity: Rated atFor service professionals managing residential or light commercial low pressure steam systems, the McDonnell & Miller 101A (Part Number 169400) remains a staple for automated level control. This 120Vac electric water feeder is specifically engineered for cold water feed applications, eliminating the need for manual monitoring and adding water to the boiler. Designed with a heavy duty solenoid, this unit handles a 150 PSI maximum water supply pressure