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See All Low Water Cut Offs (LWCO)

RB-24E Low Water Cut-Off

Discontinued product
This item has been replaced by

RB-24SE Low Water Cut-Off

Plug. Play. Protect. RB-24SE Low Water Cut-Offs are specially designed to protect hot water boilers from the hazards of a low water condition. In...
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McDonnell & Miller offers different models of the Series RB-24E Low Water Cut-Offs for easy plug and play wiring for most popular boilers. From Honeywell Aquastat L7148 and United Technology boiler controls to Weil McLain Ultra, and Lochinivar Knight and Solution boilers we have you covered.

  • Brass threads provide a metal-to-metal seal that ensures a leak-free installation
  • Integrated wrench flats enable secure installation without damage to the housing
  • “Plug & Play” wiring harnesses are available for most residential gas-burning boilers

MM 288C McDonnell & Miller GuardDog RB-24E Low Water Cut-Off

McDonnell & Miller’s patented self-cleaning probe minimizes scale build-up and extends the recommended cleaning interval to 5 years.