Water Level Controls/LWCO

Properly operating water level controls are crucial to the safety and longevity of your boiler. Most catastrophic boiler room explosions are caused by boilers operating with improper water level. It's very important to make sure your water level controls are checked regularly for proper operation. In the event you need to replace them, we can help. We stock brands such as McDonnell and Miller, Clark Reliance and Warrick as well as many brands of Differential Pressure Transmitters.

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Boiler Water Level Control

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What is a Water Level Control & What is its function?

Water level controls are designed to maintain the correct water level in your boiler, especially under times of heavy load. Some have an added feature of also being a Low Water Cut Off (LWCO) and is a required safety device required to safely operate a boiler.

Different Types of Water Level Controls & How to Choose

WARE’s wide selection of water controls includes everything your boiler needs to keep the water at the right level, and operating with maximum efficiency and safety. There are different brands and methods for controlling water level. Such as a float type, probe type, or differential pressure.  

The Role Water Level Controls Play in a Boiler

Water level controls refer to the systems in your boiler that monitor the water level, and open the feedwater valve or start a pump to add more water as needed. If the water level in a boiler gets too high, the boiler loses steam pressure, steam quality and efficiency. If the water level gets too low, the boiler can be damaged or even explode.

Helpful Resources

Relevant WARE Videos on Water Level Controls and Low Water Cutoffs

Water Level Controls Sensor Probe

Remote Water Level Indication for the Boiler Room

Knowing the Water Level in the Sight Glass

Trough Valve | Types of Water Level Controls

Low Water in a Steam Boiler 

Adding High Visibility Sight Glasses to Your Boiler Room 

McDonnell Miller 150 | Different Types of Level Controls

How to Use the Tricocks on a Steam Boiler

Bi Level Probe | Different Types of Level Controls

Understanding Boiler Pressure Controls

McDonnell Miller No. 5M Manual Reset Switch | Different Types of Level Controls

McDonnell and Miller Level Control Operation

McDonnell Miller 150 Manual Reset | Different Types of Level Controls

McDonnell Miller 193/4 with 5 Switch | Different Types of Level Controls

McDonnell Miller 7 B Switch | Different Types of Level Controls 

Explore over 750+ explanatory videos on boilers and boiler systems on our Youtube channel. Our videos can help you quickly grasp complex boiler topics. Watch more here!

Relevant WARE Blog Articles on Water Level Controls

Water Level Controls: Keep It On The Level

What to Know About Feedwater

Monitoring Your Boiler Room

How to Maintain the Strainers on a Feed Water System

Knowing the Water Level in the Sight Glass

Common Problems with a Deaerator

What is a Drip Leg

Explaining the Slow Low Water Cutoff Test

Explaining Inch of Water Column

What Does a Modulating Motor Do?

Level With Me

Replacing a Steam Boiler Sight Glass

One Screen to Control Your Entire Boiler Room

How to Clean a Boiler Glass Gauge

Our informative and educational blog content can help you gain a deeper understanding of the boiler room. Read more here!

Technical Documents

Rental Contingency Plan

Water Level Controls FAQ

Does WARE sell automated water level control systems?

We stock everything for every kind of water level control system, from manual to fully automatic, including complete new water level control systems. 

What brands of water level controls does WARE carry?

We proudly carry McDonnell Miller and Warrick, two brands that we absolutely trust to provide reliable, long-lasting equipment.