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Hydrolevel
Extended 3/4-Inch Electro-Well for HydroStat 3200 and 3250
Our Price:$53.94This extended 3/4-inch electro-well is a heating-system component for users of compatible HydroStat controls. It is used with HydroStat 3200 or 3250 units to enable the low-water cut-off function.The...
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McDonnell & Miller
Raised Face Flange Head Gasket for 150 Series
Our Price:$39.94This head gasket is for technicians and maintenance teams servicing compatible 150 Series equipment. It is used with a raised face flange head to provide the required gasket interface during service...
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Hydrolevel
Short 3/4-Inch Low Water Cut-Off Probe
Our Price:$99.94This short 3/4-inch probe is a replacement component for technicians and facility maintenance teams servicing compatible low water cut-off controls. It supports the control system’s low-water sensing...
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Hydrolevel
Standard 1/2-Inch Electro-Well for HydroStat 3200 and 3250
Our Price:$47.94This standard 1/2-inch electro-well is a heating-system component for technicians and facility maintenance teams using compatible HydroStat controls. It is used with HydroStat 3200 or 3250 controls...
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Hydrolevel
Standard 1/2-Inch Low Water Cut-Off Probe
Our Price:$94.94This 1/2-inch probe is a replacement component for facilities and HVAC maintenance teams servicing compatible low water cut-off controls. It is used with the control system’s low-water sensing...
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Hydrolevel
Standard 3/4-Inch Electro-Well for 3200 and 3250 Units
Our Price:$47.94This standard 3/4-inch electro-well is for users of compatible 3200 or 3250 units who need to enable the low water cut-off function. It provides the required component for this application.Designed...
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Choose low water cut-off equipment for the boiler control arrangement
The available products include direct low-water cut-offs, sight glass-mounted level controls, a compatible electro-well, and replacement maintenance parts. Compare the required control voltage, reset method, probe or mounting configuration, and the exact equipment compatibility stated for the item.
Popular examples in this category
24V Automatic-Reset Low Water Cut-OffWBB974608
24V Gas Steam Low Water Cut-OffWBB974603
24V Manual-Reset Low Water Cut-Off with Short ProbeWBB974592
711 Series 120V Sight Glass Low Water Cut-OffWBB974593Protect burner operation during low-water conditions
Select a low water cut-off when the application calls for immediate burner-power interruption after a low-water condition is detected. Automatic-reset models restore burner operation when water returns, while manual-reset models provide a lockout function.
Match voltage, reset type, and installation configuration
Start with the required 24V or 120V control arrangement. Then compare automatic versus manual reset, short-probe models, direct-mounted probes for low-pressure steam boilers, or sight glass mounting for applicable older boiler setups.
Support commercial and steam boiler maintenance
The range is represented by commercial boiler controls, low-pressure gas steam boiler monitoring, secondary cut-off use on steam boilers, and sight glass applications designed to work with an existing water feeder.
Find compatible components and service parts
Related items include a standard 1/2-inch electro-well for compatible 3200 and 3250 controls, a replacement head mechanism for compatible 150-S Series units, and a cartridge and strainer kit for specified Series 101A, 47, 247, and 847 equipment.
Available on automatic-reset, manual-reset, gas steam, and sight glass configurations.
Available on automatic-reset and sight glass level-control configurations.
Sight glass models maintain water level between two probes.
Specified manual-reset models lock out the burner circuit when water remains below the probe for this period.
Compare the represented low water control types
Use the table to focus on the operating features and installation arrangements described for each type.
| Product type | Best fit based on listed features | Key listed characteristics |
|---|---|---|
| Automatic-reset low water cut-offs | Commercial boiler control applications requiring burner-power interruption during low water and restart after water returns | 24V or 120V options; immediate power interruption; automatic reset; selected models include a short probe, test button, and indicator lights |
| Manual-reset low water cut-offs | Commercial boiler users or secondary cut-off applications on steam boilers | 24V operation; short-probe option; immediate power interruption; 30-second burner lockout; manual reset |
| Sight glass low water cut-offs | Applicable older boiler setups with sight glass tappings and an existing water feeder | Sight glass mounting; two-probe level control; operation with an existing feeder; manifold, probes, and quick hook-up fittings included in the stated assembly |
Plan the right fit before choosing
Decide how the cut-off should respond after water level returns
Automatic-reset low water cut-offs stop burner power when low water is detected and restart the burner when the water level returns. Manual-reset models also stop burner power and include a 30-second burner lockout when water remains below the probe; they are described as not tripping due to power failures.
- Choose 24V or 120V models to match the stated control application.
- Consider automatic reset where burner operation should resume after water returns.
- Consider manual reset and lockout functionality for compatible commercial boiler or secondary steam-boiler cut-off use.
Compare probe-based and sight glass connection arrangements
For low-pressure steam boilers, an electronic 24V control uses a direct-mounted probe positioned at or above the lowest safe water level and permits normal burner operation while water contacts the probe. Sight glass models install at sight glass tappings, maintain water level between two probes, and are designed to work with an existing water feeder.
- Short-probe cut-offs are available in 24V configurations.
- Sight glass assemblies include a manifold, two probes, and quick hook-up fittings for the stated configuration.
- Select sight glass mounting for applicable older boiler configurations.
Use listed compatibility to identify related components
Maintenance items are intended for specifically named compatible equipment. The electro-well enables the low water cut-off function when used with a compatible control, while the replacement head mechanism and cartridge-and-strainer kit are designated for their respective series.
- The standard electro-well is specified as 1/2 inch.
- The replacement head mechanism includes an integrated snap switch.
- The cartridge and strainer kit is supplied as one unit.
Common questions before buying
What does a low water cut-off do?
The listed cut-offs interrupt burner power when a low-water condition is detected. Automatic-reset versions restart the burner when the water level returns.
What is the difference between automatic and manual reset?
Automatic-reset models restore burner operation after water returns. Listed manual-reset models include a 30-second burner lockout when water remains below the probe and require manual reset.
When is a sight glass low water cut-off used?
Sight glass models are designed for applicable boilers with sight glass tappings. They maintain water level between two probes and work with an existing water feeder.
Are replacement and related components available?
The represented range includes a compatible electro-well, a replacement head mechanism with snap switch for specified equipment, and a cartridge and strainer kit for specified series.