Rachio 3rd Gen: Smart 4-Zone Sprinkler Controller, App Enabled Automated Water Scheduling, Alexa Compatible, DIY Simple & Fast Install
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FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
Unavailable
Size: 4 Zone (3rd Generation)
Style: 04 Zone Controller
Features
- SMART SPRINKLER CONTROLLER - Rachio invented the smart sprinkler category and continues to be the most trusted controller on the market. Only Rachio offers smart schedules that include plant type, soil type, sun exposure, and more.
- WORRY-FREE WATERING - Rachio tailors your watering schedule to the specific needs of your yard and plants, providing the right amount of water no matter the landscape. Ensure a beautiful yard and lower your water bill at the same time.
- NO MONTHLY FEES - Rachio comes complete and ready to use, without any extra charges or app subscription fees.
- EXCLUSIVE WEATHER TECHNOLOGY - Patented Weather Intelligence automatically skips unnecessary watering with features like rain skip, wind skip, freeze skip, and more.
- CONTROL FROM YOUR PHONE - Manage your watering from anywhere with the easy-to-use app. Run sprinklers, set and view upcoming schedules, and see your estimated outdoor water usage.
- FAST and EASY INSTALLATION - DIY installation in 30 minutes or less with no special tools needed. Compatible with 99% of existing sprinkler controllers.
Description
The product voltage arrange is 120V
Color: White
Brand: Rachio
Voltage: 120 Volts (AC)
Product Dimensions: 9.1"L x 1.4"W x 5.6"H
Material: Plastic
Product Dimensions : 9.1 x 1.4 x 5.6 inches; 1 Pounds
Item model number : 4ZULW-C
Date First Available : August 30, 2022
Frequently asked questions
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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 8 Zone (3rd Generation)
Style: 08 Zone Controller
I bought this system in April, one month before I left for a 7 month deployment. I combined this with my rainbird rain sensor and it's been incredible. First I love how easy it is to set and forget. The system does everything for you. It will automatically change water times based on the time of the year and when sunrise is. How does the system save you money? It has a soaking feature where it will start a zone for 20 minutes or whatever you have yours set up to, then it will go through other zones and eventually go back to watering the first zone. This allows your soil to soak in water and not get flooded and have run off. Essentially you aren't wasting water because of this feature. The system automatically uses weather data for your area, but if you combine the system with a rain sensor it is just that much better. The app is actually useful and works. Too many times is there a smart product where the app just sucks and doesn't make the product worth it. That is not the case with the Rachio app. This can be a one and done type of product. You set the system up, and never have to touch it again. If you actually do the work the system will work for you. What do I mean by you need to do the work? Plug in the correct information into the app. Look up the information of your sprinkler heads and what the flow rate is for them. Do a water catch test and see where in your yard you need more water. If you do these the Rachio will work that much better. Best part was that I got the system for $50 as a rebate deal through my water company so make sure to see if your water company offers the same.
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Reviewed in the United States on April 13, 2024 by Nick
Size: 8 Zone (3rd Generation)
Style: 08 Zone Controller
This controller made me wonder why I didn’t buy it sooner. It works flawlessly, fit in the same foot print as the old controller, was super easy to connect to the WiFi and sooooo easy to program. I love the soak feature where it splits each zone into two cycles to allow the water to absorb and get a more effective watering. I like that it allows you to set to run after sunset or before sunrise so you aren’t having to constantly adjust the schedule. Best part is our water district had a rebate for this controller so it was almost free and I ended up with a far superior controller unit.
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Reviewed in the United States on July 21, 2025 by James Pope
Size: 16 Zone (3rd Generation)
Style: 16 Zone Controller
I replaced a 13-year old Hunter Pro-C with this Rachio controller. It was LONG overdue. This controller is awesome. Just follow the easy instructions, keeping track of your existing wiring. I had a master valve, rain sensor, and 14 zones. Easy peasy. The app found the controller immediately, and walked me through setting up each zone. You choose your grass type, sprinkler head type, slope, etc. In the end the app recommended a watering schedule that was eerily similar to what I was already doing. Love it. And the blue glow is not really necessary but looks classy.
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Reviewed in the United States on August 20, 2025 by Turbojimmy Turbojimmy
Size: 8 Zone (3rd Generation)
Style: 08 Zone Controller
I debated for a long time before purchasing this product due to the mix of very strong reviews — both positive and negative. After using this unit for about 2 weeks, and experiencing a lot of weather in the North TX area, I’m writing to speak to both sides and offer my observations in hopes that it will help others who find themselves in the same dilemma that I did. First, let me say that this is an awesome product. Having worked in technology, and specifically software engineering and product development for 15-20 years, I truly appreciate the simplicity of the product. The entire setup process — from opening the box to having water running in our yard — lasted maybe 10-15 minutes max, and it was only that high because I spent about 5 minutes creating a label on our label maker to “mark” the zones on the outside of the unit. Some might call this overkill… my wife calls it particular… but nevertheless. Everything from the design, to engineering, to the magnetic cover, the software in the app (we use iOS)… it was simple and the experience was like opening an Apple product and having it “just work”. Second, let me speak to the setup options, since I think this is where most folks that write negative reviews get hung up. There are basically two paths to choose from, and there doesn’t really seem to be a middle ground. One path is to basically set it up as a “dumb controller” — meaning, think of what your parents probably had 20-30 years ago in their garage. You set a schedule, it is fixed, and it basically runs on certain days and times that you set. If this is your preference, then save your money and buy a different controller. There are way cheaper options on the market, and this product is going to be overkill for a schedule that simple. The other option, which is why I suspect most of you are probably interested or reading this in the first place, is what this system is really designed to do. You can set it up as a “smart controller” — meaning, you set a base schedule, along with some data points specific to your location, and these are fed into an algorithm, along with real-time weather information from your area, and it basically adjusts “on demand”. For example, if it rained more than a certain amount (you can set the threshold), or if rain is even expected in your area in the next 24 hours, it will skip a cycle. Or if it detects winds (again, you can set a threshold), it might adjust the time. Same thing for temperature below freezing, soil moisture, etc. There are a lot of options and you can customize which ones per zone… for example, one of our zones is a dedicated drip hose, so the wind alert doesn’t really matter but the soil moisture does. The neat thing is you can set multiple “schedules” and target different settings for each. The only thing to be aware of, is one of the settings is “time of day”… so if you have multiple schedules for the same day, and they are both set to “finish before sunrise”, for example, you might run into weird situations. We get around this by alternating days (or you can set a “fixed” time of day for one). Just a heads up for anyone running more complex schedules across zones. The “smart controller” setup (as I call it) is a little more work up front, and if you do it wrong, I can totally see how it will mess up your yard. However, it’s not all that difficult, and once it’s setup as intended, it’s totally worth the money. Based on our water usage, and the unpredictability of weather in the North TX area, I think this unit will pay for itself in a matter of a couple months. In the past 14 days alone, it has already saved us from running 4 different cycles for who knows how many hundreds of gallons each time. Again, this means that you actually have to do some work up front to make sure it is setup correctly. It does require a little bit of knowledge of your soil type and the ability not to over-estimate slopes. For example, just because your yard is graded (to get water away from your house) does not mean that the slope is “extreme”. All of the factors go into the algorithm… so if you get it wrong, that is not Rachio’s fault, even though it sounds like that is where most of the negative reviews stem from. It’s just like anything else with data… garbage in = garbage out. If you put good data in, then the results can be remarkable. The only downside, if there was one, is I could not get this to work with our existing rain sensor or HomeKit. The rain sensor threw false positives, and once I figured that out (thanks to Rachio alerting us "why" the system did not run), I just unplugged it and it's one less thing to have to worry about. For HomeKit, with a background in software engineering, I’ve looked into this technically and this appears to be an issue with Apple’s integration rather than Rachio. Practically, all this means is I cannot say “Hey Siri, turn on our sprinklers for 10 minutes". Would that be impressive to show off? Absolutely. But with the intelligence already built into Rachio's software, there’s a good chance I’ll never need to do anything manually ever again. In summary… this is an excellent product, but it is not for everyone. I do wish there was a review like this a few weeks back so I did not have to spend time second guessing myself before we purchased this product. All in all, this is a solid product, and I would highly recommend it… as long as you have some time to set it up correctly. I hope this helps! Justin
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Reviewed in the United States on May 4, 2021 by Justin
Size: 8 Zone (3rd Generation)
Style: 08 Zone Controller
This was my first experience with a Rachio sprinkler controller. Installing the unit was quick and easy. Linking the unit to the App and setting up the system was not. I eventually had to reset and start over the set up process several times. However, once that process was completed, things have been working just fine without any issues. I really appreciate the ability to control my system from my phone and I especially appreciate the extra features like weather tracking and automatic adjustments that come with the unit. I was a little disappointed to see that I had to pay extra in the app to take advantage of all the features that the unit offers, I’m not a fan of “pay to play.” This includes features like sprinkler valve monitoring to alert you of potential problems in your system. If the unit has that capability, then just include it in the initial cost of the product. That said, in my opinion the pros do outweigh the cons and I am happy with my purchase and do recommend it for others looking for a sprinkler valve controller with internet and app capabilities.
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Reviewed in the United States on September 22, 2025 by Paul B Burke