LW Condensate Wet Switch | HVAC Drain Pan Overflow Protection
The LeakWize LW is a condensate overflow safety switch for HVAC drain pans, air handlers, and water heaters. It replaces traditional float switches and felt-pad wet switches with isolated stainless-steel probes that eliminate false alarms in metal pans. The 5A SPDT relay handles thermostat interlocks, valve control, and BMS tie-ins directly. Manual-reset latching output prevents the system from restarting until the issue is fixed. Submersible aluminum housing, plenum-rated cable, and LED status indication are standard. The LW2 adds WiFi push notifications and an audible alarm.
VARIANTS:
LW1 - Basic Model
LW2 - Includes WiFi and Audible Buzzer
Fast-drying probe design eliminates the long reset times common with traditional wet switches.
Built-in WiFi notifications keep homeowners and contractors informed instantly.
Isolated stainless-steel sensing probes ensure metal drain pans do NOT cause false alarms.
Heavy-duty 5A SPDT relay provides direct control of HVAC equipment.
Manual-reset safety prevents equipment from restarting until the issue is fixed.
Submersible, plenum-rated stainless-steel construction delivers maximum reliability in harsh HVAC environments.
Integrated test function allows quick verification of operation without creating a real leak event.
Fast-drying probe design prevents long reset times found in typical wet switches
WiFi notification capability for real-time alerts to homeowners and contractors
Metal drain pans never cause false alarms due to isolated probe design
More robust construction than standard plastic wet switches (stainless steel + plenum cable)
Safer operation through a latching manual-reset output
More reliable detection than float-based or plastic wet switch sensors
Conforms to UL 508 for installations complying with local and national building codes.
The LW Leak Switch is fitted with an internal 5A SPDT relay which can be tied into HVAC equipment interlock circuits.
It can act as an addition or a replacement to the traditional float switch.
CLICK OR TAP THE BULLET POINTS BELOW
No Felt Pad = Fast Drying
No False Alarms From Metal Pans
Fully Sealed Electronics
WiFi Smart Life App Connectivity
Engineered to last the life of the equipment
Robust Metallic
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Commercial Grade
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- Probe Construction
- Potting Material
- Pre-Potting Sealant
- Housing Material
- Water Resistance
- Fire Rating
- Nickel
- Epoxy
- Silicone
- Aluminum
- Submersible 24H
- Plenum Rated
Wire Leads
- Wire Lead Length
- Red & Black Wire
- Yellow Wire
- Blue Wire
- Green Wire
- 6 Feet
- Power (+) Power (-)
- Normally Closed When On
- Normally Open When On
- Common
Buttons and LEDs
- Test
- Reset
- Power LED
- Alert LED
- Tests the Internal Relay
- Resets after alarm
- Constant when powered
- Lights when water detected
Mounting and Installation
- Mount Type 1
- Mount Type 2
- Wiring connections
- Common Locations
- Free standing; weight holds it down
- Secure with screws
- Splice with compliant wire connectors
- HVAC Pan, Water Heater Pan, Floor
Electrical and WiFi Specifications
- Power
- Relay Power
- Relay Type
- WiFi App
- 24V AC or DC
- 5A @ 240VAC
- Form C SPDT
- "Smart Life" app from app store(s)
Real Asked Questions (FAQ)
Setup and Compatibility
What is the LW Leak Puck and what does it do? It detects the presence of water and provides an alarm, indication, and relay output for equipment shutdown.
Does it work without WiFi? Yes. WiFi is only used for remote alerts.
Does it require an app? Connecting to the app is optional.
Is it compatible with iPhone and Android? Yes. Download Smart Life App.
Will it work with Alexa / Google Home / Apple Home? Yes if the Smart Life app is connected.
Can it connect to a smart home hub I already have? It depends on the Smart Life app capabilities. We simply communicate to the app and provide an alert through the app.
How many pucks can I use in one home? The Smart Life App allows up to 120 total devices. So, 120 pucks if no other devices are on the app.
What’s the wireless range? It must have a reasonably strong WiFi signal. If connected to the local WiFi, alerts can be received from anywhere.
Can it be used in apartments, condos, or rental properties? Yes, this is an ideal place for it. If there is no BMS, you can get alerts via the App.
Detection Performance
What liquids does it detection? The LW can detect any conductive fluid. Saltwater, condensate, domestic water, and so on. It can not detect distilled water.
How sensitive is it? As long as water touches both bottom probes, it completes a circuit and goes into alarm.
Can it detect slow leaks vs. sudden floods? It only needs approximately 1/8" of water to make contact with the problems. A small puddle will set it off.
Will it false alarm from humidity? No.
How does it reset after a leak? Manual reset button on the top.
Control and Shutdown of Equipment
Does it only work with HVAC units? No. The 5A relay is versatile and can be used to shut off a variety of equipment including electronic water valves.
How does it shut off the HVAC? The 5A relay is used to cut the 24V power source to the thermostat, effectively locking out the HVAC from running.
Why would I want to shut off the HVAC? HVAC units produce condensate when they cool air. When the air passes over the coils, the moisture in the air condenses, and is typically drained to the outside. If the condensate drain becomes blocked, it will leak from the air handling unit and could cause damage.
Don't HVAC systems have drain pans? Yes but if the pan becomes full it could overflow causing damage to the property around it.
How does it differ from a float switch? It requires power to operate. It can be tested easily, it can provide phone alerts, has an LED, and has an audible alarm. It detects water on the bottom of the pan rather than when the pan is full.
Is it required by code? If the condensate can cause damage when the drain is blocked, it is required to have a device that shuts down the unit upon detection of water.
Our warranty policy is 3 years for all products.
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