McDonnell & MillerSKU: 1767200

144703 McDonnell Miller Low Water Cut-Off RB-122E

$221.00 Sold out

The McDonnell Miller RB-122E Low Water Cut-Off safeguards your hot water boiler by automatically shutting down operation when water levels drop dangerously low. Operating without adequate water can lead to severe damage, equipment failure, or dangerous pressure buildup. This essential safety device prevents costly repairs and protects your system and occupants from potential harm.

Shipping policy

Orders placed by 2:00pm EST will ship same day, except on holidays. All orders ship via UPS/USPS/Fedex Ground.

More Details

Product overview
  • Patented Self-Cleaning Probe minimizes scale build-up and extends recommended cleaning interval to 5 years.
  • 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
  • Push-to-Test Button Enables low water cut-off protection to be verified without draining any part of the system.
  • Automatic Reset resumes operation after a power outage when water is on probe.
Specifications
Manufacturer Part Number MM_144703
UPC 683328901770
Overall Dimensions n/a
Material n/a
Domestic or Import n/a
End Style n/a
Type n/a
ADA Compliance n/a
Warning Professional Installation Recommended
Standards and Approvals n/a
Resources
Delivery & Returns

Orders will ship same day if received by 2pm EST. We ship ground via USPS, UPS, and Fedex from our warehouse in CT. We do not offer expedited shipping at this time.

Upcoming holiday closures: May 25, 2026

All returns are inspected on receipt; credit is issued after condition is confirmed. Credit is issued only for items returned in original, saleable condition after inspection.

FINAL SALE ITEMS ARE NOT ELIGIBLE FOR RETURNS OR EXCHANGES.

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