Boiler Level

McDonnell & Miller Low Water cut-offs are specially designed to protect steam and hot water boilers from the hazards of a low water condition. In operation they will interrupt the electrical current to the firing device, if the water in the system drops below the boiler manufacturer’s minimum safe water level. Our low water cut-offs also provide an additional circuit for a low water alarm, should you desire to install one, for additional protection.


Boiler Reset

256_sThe Boiler Control 256 is designed to operate a single boiler using Outdoor Temperature Reset. It can be used in applications ranging from a single zone of baseboard to multiple zones of fan coils and baseboard. This control regulates a single heating water temperature through Outdoor Temperature Reset.



090_sSnow Melting Select Your Level of Control Classic – Operate snow melting manually with a slab sensor or automatically using an automatic snow & ice detector. Performance – Use tekmarNet® communication for zoning and remote access options in snow melting systems. Designer – Remote monitoring and adjustment options are available through BACnet®, Modbus® and tekmarNet communication.