It specifically monitors flue venting

the 115277 is strictly a 24VDC coil relay

Common Questions Is the VT2417 compatible with steam applications

Direct Compatibility: Engineered specifically for the Johnson Controls T-4000 series horizontal thermostats

Key Benefits Contaminant Removal: Effectively captures moisture

McDonnell & Miller 47-2 Feeder Els PW 17895 It specifically monitors flue ventingThe McDonnell & Miller 47 2 is a heavy duty mechanical water feeder and low water cut off (LWCO) engineered for steam and hot water boilers using a cold water feed. This dual function control, part number 132800, features quick hook up fittings to simplify integration into existing gauge glass tappings. Unlike electronic alternatives, this mechanical feeder provides proportional feed action and maintains a minimum safe water level independent of