HVAC — Condensate Pan, Cooling Tower & Boiler Level

- Nov 9, 2026-

Heating, ventilation, and air conditioning systems run around the clock, and their level sensors must be maintenance-free and long-lived. Reed float switches meet those demands: they are sealed, passive, and reliable for millions of operations, which is why they are the standard choice for condensate pans, cooling towers, and boilers.

Condensate Pan and Cooling Tower Level

Air conditioning condensate pans and cooling towers need level monitoring to prevent water damage and to protect pumps. If the water level in a condensate pan rises too high, it can overflow and damage the building below; a reed float switch raises an alarm or shuts the system down before that happens. If the level in a cooling tower falls too low, the pump can run dry and be damaged; a low-level switch protects it. Keeping the water level correct also maintains the efficiency of the whole HVAC system, and the sensors work reliably for years without attention.

Boiler Low-Water Cutoff

A boiler that runs low on water can dry-fire and explode, so a low-water cutoff is a mandatory safety device. A reed float switch in the boiler cuts the burner when the water level falls to the danger point. The design is simple and reliable and needs no power to operate, which is exactly what a safety device requires. Low-water cutoff switches are an industry-standard product, and reed float versions are widely used for this duty.

Preventing Water Damage and Dry Running

Water damage from an overflowing condensate pan or cooling tower can cost far more than the sensor that would have prevented it, and a pump that runs dry can destroy itself in minutes. Reed float switches guard against both failures at very low cost: a high-level switch stops the water before it overflows, and a low-level switch stops the pump before it runs dry. Because the switches are sealed and passive, they work reliably for years in plant rooms that are hot, humid, and rarely visited.

Why Reed and Level Sensing

Reed float switches are sealed against moisture and scale, switch without contact, and need no power to hold a state. They survive the heat and humidity of HVAC plant rooms and keep working for years with no maintenance. For building services engineers, they are the proven, low-cost choice for condensate, cooling tower, and boiler level control.