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NEVER REPLACE
An Electronic Water Controller Again!

Cooling Tower Water Level Controls

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Never replace an Electric Level Controller or float switch again!


Cooling TowersIt is common in commercial markets to find evaporative coolers for water in the form of cooling towers. In both water and air cooling applications, evaporative cooling relies on constant water flow. It is common for a small mechanical float to be installed on the basin to control the fluctuation of the water level, but these floats are regularly unreliable and unable to inform the building management system of how much water there is in the basin.


Evaporative Cooling and Waterline Controls


Waterline Controls is a direct replacement water level control system that has a 15 year expected duty life. The WLC Series uses stainless steel probes with up to six functions to maintain the water level, alert the facility manager of high or low levels, cut off a basin heater, and read the water temperature. All of these functions are controlled by software, which can be directly connected to the Building Management System using dry contacts. Ensure your evaporative cooling application lives a long and hard working life by choosing Waterline Controls.


Cooling Tower Level ControlsThe WLC Series may look like the competition but the unit is revolutionary in its design. The WLC Series is perfect in any application where water level management is important such as cooling tower basins and water holding tanks for cooling towers. It uses a microprocessor that monitors all probes for correct operation and then provides the corresponding outputs to drive the power relays, the Building Automation System and a visual indication of the operational status. The Modular construction and a self-test feature insure user-friendly operation. By using a very low voltage and current, WLC Series sensors never foul or degrade. So when we say “Never Replace A Water Level Controller Again” we mean it! These Kits are considered a complete kit for water level management. They include the sensor, the mounting assembly for the sensor and the WaterLine Control panel. The only other item needed is a fill valve which connects directly to these units.

We offer a 100% Satisfaction Guarantee along with our Lifetime Limited Warranty so you can be sure you are getting the best product for the best value you can expect. Cooling Tower water level management is one of the most critical aspects of a properly operating system. With dry-contact integration outputs in every Waterline Controls model, this critical function can be easily tracked and controlled using your existing building automation system. Waterline Controls’ over 20 years of experience takes the guesswork out of water level management.


Direct Replacement Units for BAC, Evapco & Marley


Any Waterline Controls’ electronic water level controller models can be used to replace worn out BAC*, Evapco* and Marley* cooling tower units. But, if you need a direct replacement, you can order them from us and SAVE MONEY. With our system for cooling towers, you will never have to replace a water level controller again!

Our direct replacement models include all the features and functions of the other brand name units including Vanstone flange-style assemblies and custom sensor lengths from one inch to ten feet.

PLUS our direct replacement models ALSO INCLUDE the following exclusive features & benefits available ONLY in Waterline Controls’ electronic water level controllers.
Click here for more information.

Additional Information


Enclosure: 8-3/4” X 10-1/2” X 6” including the hinge and the latch. For indoor and outdoor use.

Sensor assembly: 3” diameter and 20” long.

Electrical: Controls operate at 0.5AMPS at 110VAC Internal Relay Contacts rated 30AMPS at 250Volts Dry Contacts for BAS are rated 0.5AMPS at 60Volts.

The Sensor is Intrinsically Safe.
  • WLC-3000-Fill Only

    WLC-3000-Fill Only

    Fill Only With Diagnostics-Complete Kit Includes Sensor With 50 ft. Sensor Wire, The Controller, and Mounting Assembly.
    Fill Only | SINGLE-CONTACT POINT | Custom Sensors lengths available upon request | 4-wire Dry contacts to BMS for measuring Fill “ON” time and fault conditions. Operates any 110VAC valve. (Not supplied in this kit (See Options Section for valves).

  • WLC-4000-Fill W/High Alarm

    WLC-4000-Fill W/High Alarm

    WLC-4000 – Fill w/ High Alarm – Electronic Water Level Control | Complete Kit Includes Sensor With 50 ft. Sensor Wire, Controller, and Mounting Assembly | Fill w/ High Alarm | TWO-CONTACT POINT SYSTEM | Custom Sensors lengths available upon request | 6-wire Dry contacts to BAS for measuring Fill “ON” time, High Water Alarm and fault conditions. () Operates any 110VAC valve & 110VAC audible alarm (Not supplied in this kit.)

    Liquid level controls & water level controls: Water level controls for cooling towers, Boilers and holding tanks. Each Model is different
    Liquid level controls & water level controls: Water level controls for cooling towers, Boilers and holding tanks. Each Model is different
  • WLC-4500-Fill W/ Low Alarm

    WLC-4500-Fill W/ Low Alarm

    WLC-4500 – Fill w/ Low Alarm – Electronic Water Level Control | Complete Kit Includes Sensor With 50 ft. Sensor Wire, Controller, and Mounting Assembly | Fill w/ Low Alarm | TWO-CONTACT POINT SYSTEM | Custom Sensors lengths available upon request | 6-wire Dry contacts to BMS for measuring Fill “ON” time, Low Water Alarm and fault conditions. Operates any 110VAC valve & 110VAC audible alarm (Not supplied in this kit.)

  • WLC-5000-Fill W/High & Low Alarm

    WLC-5000-Fill W/High & Low Alarm

    WLC-5000 – Fill w/ High & Low Alarm – Electronic Water Level Control | Complete Kit Includes Sensor With 50 ft. Sensor Wire, Controller, and Mounting Assembly | Fill w/ High Alarm | THREE-CONTACT POINT SYSTEM | Custom Sensors lengths available upon request | 8-wire Dry contacts to BMS for measuring Fill “ON” time, Low Water Alarm, High Water Alarm and fault conditions. Operates any 110VAC valve & 110VAC audible alarm (Not supplied in this kit.)

  • WLC-6000-Liquid level Fill/W High&Low Alarms and Low-Low Heater Cut Off

    WLC-6000-Liquid level Fill/W High&Low Alarms and Low-Low Heater Cut Off

    WLC-6000 – Fill w/ High & Low Alarms and a Low-Low Basin Heater Cut-off – Electronic Water Level Control | Complete Kit Includes Sensor With 50 ft. Sensor Wire, Controller, and Mounting Assembly | Fill w/ High & Low Alarm and Low-Low Basin Heater Cut-off| FOUR-CONTACT POINT SYSTEM | Custom Sensors lengths and wire lengths available upon request | 10-wire Dry contacts to BMS for measuring Fill “ON” time, High Water Alarm and fault conditions.- liquid level fill w high and low alarm & heater cut off.

  • WLC-6100T-Fill W/High & Low Alarms and Basin Heater Controls

    WLC-6100T-Fill W/High & Low Alarms and Basin Heater Controls

    WLC-6100T – Fill w/ High & Low Alarms and a Low-Low Basin Heater Cut-off and Basin Heater Controls – Electronic Water Level Control | Complete Kit Includes Level Sensors & Temperature Sensor With 50 ft. Sensor Wire, Controller, and Mounting Assembly | Fill w/ High & Low Alarm and Low-Low Basin Heater Cut-off & Heater Control| FOUR-CONTACT POINT SYSTEM WITH ONE TEMPERATURE SENSOR | Custom Sensors lengths and wire lengths available upon request | 10-wire Dry contacts to BAS for measuring Fill “ON” time, High Water Alarm, Low Water Alarm, Heater “ON” and fault conditions.

    The heater control relay is designed to be a pilot relay for operating a 110VAC coil on a contractor properly sized for the heater. The temperature probe is built into the water level sensor and is to be mounted below the minimum water level of the tank (see the accompanying figure). It is also to be mounted at least 24 inches from the tank heater.