Resideo Highlights New First Alert Water Leak Detection Solution for HVAC at AHR 2024

Resideo First Alert

Resideo Technologies, a leading global provider of solutions for home comfort, energy management, and security, unveiled the First Alert L2 WiFi Water Sensor and Switch at the AHR Expo (booth #S10123) in Chicago. The First Alert L2 sensor is the latest addition to Resideo’s award-winning First Alert L Series, a line of connected water-leak detection and shutoff products to help protect homes from costly water damage.

The First Alert L2 sensor can automatically shut off or turn on HVAC equipment – including, air conditioners, heat pumps, dehumidifiers, and pumps, among others – if condensation or moisture is sensed where it doesn’t belong. It’s the only sensor on the market that features: WiFi connectivity, a sensing cable for added coverage, and monitors temperature and humidity trends.

"By expanding our water leak detection and protection solutions to HVAC applications, Resideo can now offer our HVAC partners and their homeowners even more ways to help safeguard properties against water damage, which is one of the most common and costly home insurance claims,” said Pat Tessier, Senior Director of Product Marketing at Resideo. “The First Alert L2 sensor delivers on our mission to help protect what matters most by eliminating the guesswork of locating excess condensation or moisture and stopping water damage at the source.”

An ideal solution to minimize damage following a coil freeze-up if a condensate pan overflows, the First Alert L2 Water Sensor and Switch will be available through select North American distributors in February 2024. It offers:

  • Easy installation. The L2 sensor is hardwired to HVAC equipment and doesn’t require a battery. Ideal for hard-to-reach installation locations, it features a reusable, five-foot cable sensor.
  • Intelligent sensing. The L2 sensor monitors water, humidity and temperature and can be re-set after a leak occurs.
  • Smart leak alerts. Homeowners are informed if condensation or overflow from HVAC equipment has occurred via the Resideo app. The device also features LED lights that flash and a 100 dBA alarm when a leak is sensed.
  • Expanded coverage. The L2 sensor is the next solution in company’s L Series line, which includes the First Alert L5 WiFi Water Leak Shutoff Valve and the First Alert L1 WiFi Water Leak and Freeze Detector.

At AHR 2024, Resideo also showcased new hydronic and potable water sizes and fittings for its existing product lines to offer increased performance and customization. For more information about Resideo’s full breadth of products and services, visit


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