Smart and Wi-Fi Irrigation Controllers

Usually yes. A Wi-Fi controller drives the same valves through the same wiring: one wire per station plus a shared common, and any sensor or master valve leads. The checks before buying are the number of stations in the ground, a spare terminal or two, and whether the Wi-Fi signal reaches the spot where the controller mounts.

EPA WaterSense labels both. A weather-based controller uses local weather and landscape conditions to adjust the schedule, so it needs a network connection or an on-site weather sensor. A soil moisture-based controller reads a buried sensor and holds irrigation while the soil is still wet; beds with mixed plants and root depths need more than one sensor.

EPA WaterSense estimates that replacing a standard clock-based controller with a WaterSense labeled one can save an average home up to 15,000 gallons a year. EPA ties that figure to proper installation, programming and maintenance, so the saving depends on the stations being described correctly and on leaks and coverage being fixed first.

Most models keep running their last saved schedule from memory and stop adjusting it until the connection returns, but that behavior varies by product and should be confirmed for the unit installed. A rain sensor wired directly to the controller keeps working offline, which is why one is worth keeping even with a weather-based controller.