Kasa Smart 3-Way Dimmer Switch KIT Review (2025): Finally, a Simple Smart Upgrade for Multi-Switch Lights?
You know the struggle: you walk into a dark room and fumble for the switch at one entrance, only to have to walk across the room in the dark to turn on another switch for the same light. That’s a 3-way switch setup, and for years, making it “smart” has been a huge headache.
Most smart switches only work in a single-pole setup (one switch for one light). To smarten a 3-way circuit, you often had to buy two expensive smart switches and figure out complex wiring, or use awkward add-on modules that required an electrician’s help.
But what if you could upgrade your existing 3-way setup with a simple, all-in-one kit that’s as easy to install as it is to use?
That’s the promise of the Kasa Smart 3-Way Dimmer Switch KIT. This kit includes everything you need to replace your old switches and gain smart control over lights in your stairways, hallways, and large rooms. But does it deliver a frustration-free experience?
We wired it up to find out.
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What is a 3-Way Switch & Why Is This Kit a Game-Changer?
First, a quick lesson. A 3-way switch is simply a setup that allows you to control one light from two different switch locations. Think of a hallway with a switch at both ends, or a stairway with a switch at the top and bottom.
The Kasa Smart 3-Way Dimmer KIT solves this elegantly by providing two different switches:
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One Smart Dimmer Switch: This is the brains of the operation. It has Wi-Fi, connects to the app, and handles the dimming functionality.
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One Companion (Add-On) Switch: This is a “dumb” smart switch. It doesn’t connect to Wi-Fi on its own but communicates directly with the smart dimmer to tell it to turn on/off from the second location.
This is far smarter and more cost-effective than buying two full-priced smart switches.
Unboxing the Kit: What You Get
Inside the box, you’ll find a complete solution:
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1x Kasa Smart Dimmer Switch (HS220 Kit Version): The main smart switch with a dimming slider.
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1x Kasa Companion Switch: The coordinating secondary switch.
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2x Faceplate Screws: For securing the switches to the wall box.
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2x Wire Connectors (Wire Nuts): For securing your electrical connections.
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A Quick Start Guide: With clear wiring diagrams.
It’s a no-frills package that includes the essentials for a safe and successful installation.
Standout Features: Why You’ll Love This Kit
1. Truly Hub-Free Operation
Like all Kasa products, this dimmer kit connects directly to your home’s 2.4GHz Wi-Fi network. There is no need to buy a separate hub or bridge, which saves you money and simplifies your smart home setup.
2. Easy Voice Control with Alexa & Google Assistant
Once installed, you gain full hands-free control.
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“Alexa, turn on the staircase light.”
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“Hey Google, dim the dining room lights to 50%.”
This is incredibly convenient when your hands are full or you’re already cozy on the couch.
3. Robust Scheduling & “Away Mode”
The free Kasa Smart app unlocks powerful automation:
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Set Schedules: Have your hallway lights turn on automatically at sunset and off at sunrise.
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Create Scenes: Coordinate multiple Kasa devices with a single tap.
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Away Mode: Randomly turn your lights on and off to make it look like someone is home when you’re on vacation—a powerful security feature.
4. The Physical Dimming Slider & Favorite Light Preset
The smart dimmer switch has a subtle, touch-sensitive slider on the side. Running your finger up and down it provides smooth, precise dimming. You can also set a “Favorites” level in the app, and a quick tap on the physical switch will recall that exact brightness.
5. Reliable 3-Way Control from Anywhere
This is the core benefit. You can control the light from:
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The first physical switch location.
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The second physical switch location.
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Your smartphone, from anywhere in the world.
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Your voice via a smart speaker.
No more “dark walks” across the room!
👉 See the Wiring Diagram on Amazon
The Installation Process: A Beginner-Friendly Guide
Warning: Always turn off the power at the circuit breaker before working with any electrical wiring.
The installation is straightforward for anyone comfortable with basic DIY.
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Turn Off Power: Confirm the power is off with a voltage tester.
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Identify Your Wires: You’ll likely have a black (hot), two traveler wires (often red and black), and a ground (bare copper) in each box.
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Follow the Kasa Diagram: The kit’s guide provides clear, color-coded wiring diagrams for both the smart dimmer and the companion switch.
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Make Connections: Use the provided wire nuts to connect the wires as instructed. The terminals on the Kasa switches are clearly labeled (Line/Load, Traveler, Neutral).
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Secure and Power On: Tuck the wires back, screw the switches into the wall box, attach the faceplate, and restore power.
The app will then guide you through connecting the switch to your Wi-Fi network.
Who is the Kasa Smart 3-Way Dimmer KIT PERFECT For?
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Homeowners with existing 3-way switches in hallways, staircases, or large rooms.
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DIY Enthusiasts who are comfortable with basic electrical work.
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Anyone invested in the Alexa or Google smart home ecosystems.
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Users wanting to add smart lighting without a monthly fee or extra hub.
Considerations Before You Buy
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Neutral Wire Required: Like most smart switches, this kit requires a neutral wire in your wall box for operation. Most homes built after the 1980s have this.
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2.4GHz Wi-Fi Only: It will not connect to a 5GHz network.
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Basic Electrical Skill Needed: While easier than most, you must be confident in your ability to safely wire a light switch.
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Single-Pole Conversion: This kit can also be used in a standard single-pole setup (one switch), making it versatile.
The Verdict: Is the Kasa Smart 3-Way Dimmer KIT Worth It in 2025?
Yes, it is the definitive solution for smart 3-way lighting.
The Kasa Smart 3-Way Dimmer Switch KIT eliminates the historical complexity and cost of upgrading multi-switch circuits. It provides a complete, coherent, and incredibly reliable system that just works.
The value of being able to control your lights from bed, your couch, or another country—while still having full physical control at all switch locations—cannot be overstated. When you factor in the robust scheduling, voice control, and the peace of mind from “Away Mode,” this kit transforms from a simple convenience into a core component of a modern, efficient, and secure home.
For anyone tired of the 3-way switch dilemma, this kit is the perfect answer.
Ready to solve your 3-way switch problem? Click the button below to see the latest price and customer reviews on Amazon.
🛒 Buy the Kasa Smart 3-Way Dimmer Kit on Amazon
Frequently Asked Questions (FAQ)
Q1: What’s the difference between this kit and buying two separate Kasa smart switches?
This kit includes one smart dimmer and one companion switch. The companion is cheaper and designed specifically to work with the main dimmer in a 3-way setup. Buying two full smart switches is more expensive, unnecessary, and can cause wiring conflicts.
Q2: Do I need a neutral wire?
Yes, the Kasa smart dimmer switch requires a neutral (usually a bundle of white wires) in the wall box for it to power on. Check your switch box before purchasing.
Q3: Can I use this kit in a 4-way circuit (controlling a light from 3+ locations)?
Yes, but you will need to purchase additional companion switches. In a 4-way setup, you replace the two main 3-way switches with this kit (smart dimmer + companion) and replace any intermediate 4-way switches with additional Kasa companion switches.
Q4: Is the companion switch also a smart dimmer?
No. The companion switch can only turn the lights on and off from the second location. The dimming function is controlled only by the main smart dimmer switch, either physically, via the app, or by voice.
Q5: What if I only have a 3-way setup in one location? Can I buy another main dimmer later?
It’s best to use the kit as designed: one smart dimmer per light circuit. You can, however, expand your system by buying additional kits or individual companion switches for other lights in your home, all controlled through the single Kasa app.
Deals & Gift Guide Angle
The Gift of Convenience and Safety
While a light switch isn’t a traditional gift, the Kasa Smart 3-Way Dimmer KIT is a fantastic practical gift for:
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New Homeowners: Help them modernize their new house from day one.
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Your Parents: Make their home safer and more convenient, especially for stairway lighting.
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The Tech-Savvy Friend: They’ll appreciate the seamless smart home integration.
Prime Day and Black Friday are the best times to buy! Kasa smart home products are consistently among the top deals during Amazon’s major sales events. It’s the perfect time to buy multiple kits to upgrade your entire home’s lighting affordably.
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