Pump Controllers

Z-1 Single-Zone Pump Control for hydronic systems. 120V, 24VA thermostat current. Learn More

AQS-1/2"Copper Aquastat for NRF/NBF pumps. OFF (open) 120F, ON (closed) 100F. Learn More

AQS-3/4"Copper Aquastat for NRF/NBF pumps. OFF (open) 120F, ON (closed) 100F. Learn More

Model AZ-1A Pump Controller for thermostatically controlled heating pumps up to 1/6HP. 115 volt, 1ph., 24 volt, 5 amp relay. Learn More

Z-3 Three-Zone Pump Control for hydronic systems. 120V, 24VA thermostat current. Learn More

Z-4 Four-Zone Pump Control for hydronic systems. 120V, 24VA thermostat current. Learn More

Z-6 Six-Zone Pump Control for hydronic systems. 120V, 24VA thermostat current. Learn More

McDonnell & Miller model number 42S is a combination float-operated low water cut-off and pump controller for steam boilers that have a separate water column. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection. Learn More

McDonnell & Miller model number 42S-A is a combination float-operated low water cut-off and pump controller with quick hook-up fittings for steam boilers. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection. Learn More

McDonnell & Miller model number 42S-N is a combination float-operated low water cut-off and pump controller with 1/2" IP gauge glass connections for steam boilers. This control features an automatic reset and two 120 volt, bi-metal, two-wire, single pole, single throw snap switches. Its maximum pressure is 50 psi and it has a tapped 1" FIP connection. Learn More

McDonnell & Miller model number 93M is a combination float-operated low water cut-off and pump controller with 1" FIP tapped connections for steam boilers with a separate water column. This control features a manual reset with standard number 5 single pole single throw switches. Its maximum pressure is 150 psi. Learn More

McDonnell & Miller model number 93 is a combination float-operated low water cut-off and pump controller with 1" FIP tapped connections for steam boilers with a separate water column. This control features an automatic reset with standard number 5 single pole single throw switches. Its maximum pressure is 150 psi. Learn More

McDonnell & Miller model number 93-7B is a combination float-operated low water cut-off and pump controller with 1" FIP tapped connections for steam boilers with a separate water column for low water cut-off and pump control, as well as, proportional control for constant boiler water level. This control features an automatic reset with optional number 7B single pole single throw switches. Its maximum pressure is 150 psi. Learn More

McDonnell & Miller model number 93-7BM is a combination float-operated low water cut-off and pump controller with 1" FIP tapped connections for steam boilers with a separate water column for low water cut-off and pump control, as well as, proportional control for constant boiler water level. This control features a manual reset with optional number 7BM single pole single throw switches. Its maximum pressure is 150 psi. Learn More

McDonnell & Miller model number 94A is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features an automatic reset with standard number 5 single pole single throw switches. Its maximum pressure is 250 psi. Learn More

McDonnell & Miller model number 94M is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features a manual reset with standard number 5 single pole single throw switches. Its maximum pressure is 250 psi. Learn More

McDonnell & Miller model number 94 is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features an automatic reset with standard number 5 single pole single throw switches. Its maximum pressure is 250 psi. Learn More

McDonnell & Miller model number 94-7B is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features an automatic reset with optional number 7B single pole single throw switches. Its maximum pressure is 250 psi. Learn More

McDonnell & Miller model number 94AM is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features a manual reset with standard number 5 single pole single throw switches. Its maximum pressure is 250 psi. Learn More

McDonnell & Miller model number 94A-7B is a combination float-operated low water cut-off and pump controller with 1-1/4" FIP tapped connections for steam boilers with a separate water column. This control features an automatic reset with optional number 7B single pole single throw switches. Its maximum pressure is 250 psi. Learn More