Description
Product Summary
The McDonnell & Miller RB-122-E is a low water cutoff from McDonnell & Miller, described by the manufacturer as: (RB-122) 144703 120V probe type low water cut off for hot water boilers includes test switch. It is rated for 120V. It replaces PS851-120 RB-122 RB-120 900 901 144676.
A low water cutoff shuts the burner off if the boiler water level drops below a safe point, preventing a dry fire that can damage the boiler. Replace a cutoff that does not shut down the burner during its test, has a damaged probe or float, or gives false low-water lockouts after cleaning.
Before you order, match RB-122-E to the part number on the part you are replacing or in your equipment's repair parts list, and confirm the voltage, size and connections match your equipment. If you are not sure which part your equipment needs, call us at 1.888.509.3391 with the model and serial number and we will confirm it for you.
Key Features
- Genuine McDonnell & Miller part: Manufacturer part number RB-122-E, factory new.
- Voltage: 120V.
- Cross-reference: Replaces PS851-120 RB-122 RB-120 900 901 144676.
- Includes: Test Switch.
Frequently Asked Questions
Is this a genuine McDonnell & Miller part?
Yes. This is the McDonnell & Miller RB-122-E, a factory-new low water cutoff from McDonnell & Miller.
How do I make sure it fits my equipment?
Compare RB-122-E with the part number printed on the part you are replacing or listed in your equipment's repair parts list, and confirm the voltage and connections match. If you are not sure, call us at 1.888.509.3391 with your model and serial number and we will confirm it.
What part numbers does the RB-122-E replace?
The McDonnell & Miller RB-122-E replaces PS851-120 RB-122 RB-120 900 901 144676.
How often should a low water cutoff be tested?
Follow the manufacturer's schedule. Many probe and float cutoffs call for regular testing and periodic cleaning or flushing.
Should a professional install this part?
Yes. Gas, electrical, hydronic and combustion components should be installed by a qualified technician who can test the system afterward and follow the codes that apply where you live.
