This article is about irrigation computers for controlling solenoid valves. The most important models available on the market are presented and explained what distinguishes them from one another and what criteria to look out for when buying such a computer.
Only those computers that are required to control solenoid valves are dealt with here. In principle, these can be imagined as electrical junction boxes, except that the cables are not connected here for a circuit, but for the switching of solenoid valves. Although two cables lead from each solenoid valve to connect to the irrigation computer, each additional valve only requires one additional connection option in the irrigation computer. Because the black phase cables are bundled in a community cable and therefore they always need exactly one connection option, regardless of the number. In the professional sector, this type of irrigation computer is used almost exclusively. Another type of irrigation computer, in which the valve is permanently integrated in the irrigation computer and the water flows through, is dealt with in a second blog post of sprinkler timers.
The number of valves that can be connected and thus the number of irrigation sectors that are possible with the computer is the basic key figure when selecting the computer. In addition, there are a handful of other fundamental differences that also explain the large number of different irrigation computer models and types from the major suppliers like Hunter, Rain Bird, Orbit or Racchio.
Indoors or outdoors
Irrigation computers are offered that are only suitable for indoor use and those that can be used outdoors. The former are a cheaper alternative if you can mount the computer in the basement or technical room, for example, otherwise you need the wind and weather-protected outdoor model in any case. In outdoor models, the transformer is housed in the irrigation computer, in indoor models it hangs outside. With Hunter and Rain Bird, the indoor models can be recognized by an “i” in the type designation.
Electricity or battery operated
Irrigation computers for valve control are usually powered by electricity, which means you need a connection to the power grid to be able to operate the computer. Hunter, Rain Bird and Orbit also offer battery-operated models in their range, Hunter also has a hybrid model that can be operated with both batteries and electricity. The battery-operated watering computers do not work with the normal 24 volt solenoid valves, but with 9 volt solenoid valves.
See blog post: Solenoid valves – which ones are there and how do they differ?
Fixed or flexibly expandable number of valve connections
Most of the models have a certain, specified number of connections, which means you can connect a maximum of this number of valves. Other models can be expanded in the modular system, e.g. you start with 12 connections and can then expand as required, e.g. in blocks of 6 up to a certain specified maximum number.
Web enabled or not
In addition to the usual, autonomously operating computers, WiFi-enabled computers are also available, which can be connected to the web via WiFi. On the one hand, this enables programming and operation via app and, on the other hand, it is also the basis for integrating irrigation into home automation. Additional services such as controlling the irrigation via local weather data received via the web are also offered, so that the web connection can also be used as a substitute for the use of sensors.
Hunter took a big step in this area in 2016 with the acquisition of the Australian company Hydrawise and bought a lot of expertise. Hydrawise was only founded in 2011 and specialized exclusively in the production of WiFi-enabled irrigation controllers and irrigation software. The result of this acquisition is the WiFi enabled Hunter HC Hydrawise range.
Rain Bird initially went a different route and did not offer its own WiFi-enabled models, but instead offered the option of making some of its models WiFi-enabled using an additional expansion module. The module is simply plugged into a pre-reserved slot. This option is still available and Rain Bird now also has models with a fixed WiFi connection in its range.
Orbit offers quite powerful web-enabled computers at a very attractive price and Racchio is the first choice for many users when it comes to web-enabled computers.
Extra models for self-sufficient installation in the valve box
Rain Bird, Hunter and Orbit also have a battery-operated, very space-saving, compact model on offer that is intended for direct attachment to the valves or in the valve box: The computer is housed in the valve box and controls from there – depending on the model or multiple valves. This is primarily a variant for more remote locations that are difficult to reach with electricity.
Below is an overview of the most important watering computers on the market from the point of view of a private user:
Good value irrigation computers
This computer are limited to the essential functions, i.e. they largely do without what is not absolutely necessary in favor of a lower price and also have a manageable number of outputs and no web access. This does not mean, however, that these would perform worse than the more expensive models for the requirements of normal operation. The models listed here are very solid irrigation computers.
The following sprinkler computer are offered in different variants, for example for 4, 6 or 8 valves. For the sake of simplicity and clarity, however, these model variants are not considered individually here and in the following, but are listed in the table under “Model variants”.
Tip: Always calculate a certain reserve with regard to the number of solenoid valves, so it is always better to buy one size larger. If you need 4 sectors according to your calculation, then it is better to buy the model to which you can connect 6 solenoid valves. This way you stay relaxed if you made a mistake in planning and still need one more sector, or if you want to expand the irrigation later.
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Hunter X-Core (Hunter XC) | Rain Bird ESP-TM2 | Orbit Easy-Set Swingdoor Timer | |
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Hunter Sprinkler Irrig...11% OffCompatible with Hunter's ROAM Remote Control Control up to 6 Stations with 3 Programs and 4 Start Times each Hunter Quick Check helps troubleshoot field wiring issues Automatic Short Circuit Protection Easy Retrieve Memory
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Rain Bird ESP-TM2 8 St...Quick to Install. Suitable for indoor or outdoor installations. Factory installed 6’ outdoor rated power cord for your convenience Simple to Program. Quickly program a schedule in just 3 steps. NEW large back-lit LCD display for improved visibility i... read more
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Orbit 57894 4-Station ...WATER YOUR YARD WITH EASE - Our Easy Set Logic sprinkler timer is the perfect choice for your yard, controlling up to 12 zones/stations for efficient irrigation. INDOOR AND OUTDOOR INSTALLATION - Engineered with a locking cabinet with two keys for bo... read more
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Model variants | 7 variants: XC-4 (4 outlets, outdoor model), XC-6 (6 outlets, outdoor model), XC-8 (8 outlets, outdoor model), XC-2i (2 outlets, indoor model), XC-4i (4 outlets, indoor model), XC-6i (6 outlets, indoor model), XC-8i (8 outlets, indoor model) |
4 variants: ESP-TM2-4 (4 outlets), ESP-TM2-6 (6 outlets), ESP-TM2-8 (8 outlets), ESP-TM2-12 (12 outlets) |
4 variants: 57894 (4 outlets), 57896 (6 outlets), 57899 (9 outlets), 57900 (12 outlets) |
Number of connectable solenoid valves | 2, 4, 6 or 8 | 4, 6, 8 or 12 | 4, 6, 9 or 12 |
Can be used with 24 volt or 9 volt solenoid valves | 24 Volt | 24 Volt | 24 Volt |
Programming option | 3 programs with up to 4 start times can be defined | 3 programs with up to 4 start times can be defined | 3 programs with up to 4 start times can be defined |
Watering duration | 1 to 240 minutes | 1 to 360 minutes | 1 to 240 minutes |
Global increase/decrease of duration | 10 to 150% | 5 to 200% | No |
WiFi? | No | No (but can be added optionally with LNK-WiFi Modul) | No |
Connectable sensors | 1 | 1 | 1 |
Electricity/battery | Electricity | Electricity | Electricity |
Indoor/Outdoor | Both | Outdoor | Outdoor |
Special feature | Can be used with Hunter Solar Sync Sensor |
Web-connected irrigation computers
The following irrigation computers have a built-in WiFi connection and can therefore be controlled via mobile phone or desktop computer. They also offer additional web-based functions such as weather-dependent irrigation control.
Orbit B-hyve Smart Irrigation Controller | Hunter HC Hydrawise | Rain Bird ST8 | |
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Orbit B-hyve 12-Zone S...$121.26 (as of 27. July 2025 10:08 GMT +02:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)EFFICIENT WATERING SOLUTION - The smart sprinkler controller ensures automatic watering with precision, saving you time and effort. INDOOR AND OUTDOOR PLACEMENT - This automatic watering system can be placed indoors or outdoors providing the maximum ... read more
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Hunter Industries HC60...$349.00 (as of 27. July 2025 10:08 GMT +02:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Ideal for residential and light commercial applications up to 6 stations — save up to 50% on your water bill! Automatically adjusts irrigation schedules based on local weather data to provide maximum water savings and healthy, beautiful landscapes Ma... read more
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Rain Bird ST8I-2.0 Sma...7% OffWiFi signal conveniently places control of your timer in the palm of your hand Super easy to program; allows access to timer functions from anywhere in the world Compatible with: Amazon Alexa, Google Assistant, Apple iOS 8 or greater, and Android 4.4... read more
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Model variants | 2 variants: 57946 (6 outlets), 57950 (12 outlets) |
2 variants: HC-600i (6 outlets), HC-1200i (12 outlets) |
2 variants: ST8I (8 outlets, indoor), ST8O (8 outlets, outdoor) |
Number of connectable solenoid valves | 6 or 12 | 6 or 12 | 8 |
Can be used with 24 volt or 9 volt solenoid valves | 24 Volt | 24 Volt | 24 Volt |
Programming option | 4 programs can be set, with up to 4 start times | 6 programs with up to 6 start times | 6 start times for every zone |
Watering duration | 1 to 240 minutes | 1 to 1,440 minutes | 0 to 199 minutes |
Global increase/decrease of duration | No | 0 to 200% | -90% to +100% |
WiFi? | Yes | Yes | Yes |
Connectable sensors | 1 | 1 | 1 |
Electricity/battery | Electricity | Electricity | Electricity |
Indoor/Outdoor | Outdoor | Indoor | Indoor/Outdoor |
Special feature |
Hunter Pro-HC | Racchio 3 | Orbit 57995 B-hyve XR Smart | |
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Hunter PRO-HC PHC-600 ...$271.00 (as of 29. July 2025 15:30 GMT +02:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)PRO-HC Outdoor WiFi Controller with Internal Transformer Run up to 6 Zones Touchscreen Interface Predictive Watering Adjustments & Wiring Detection and Alerts Hydrawise EPA WaterSense Approved Smart Watering
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Rachio WiFi Smart Spri...13% OffDITCH THE DIAL – Upgrade to smart irrigation with the free Rachio app for precise, easy control. AUTOMATIC WEATHER SKIPS – Patented Weather Intelligence skips watering for rain, wind, freeze & more. SAVE WATER YEAR-ROUND – Adaptive schedules help you... read more
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Orbit 57995 B-hyve XR ...12% OffSMART UNDERGROUND WATERING TIMER - Effortlessly manage your watering schedule with our advanced technology. Control and monitor your underground sprinklers from anywhere with WiFi connectivity. WIFI WATERING TIMER - Experience the convenience of remo... read more
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Model variants | 6 variants: PHC-6i (6 outlets, indoor), PHC-12i (12 outlets, indoor), PHC-24i (24 outlets, indoor), PHC-6 (6 outlets, outdoor), PHC-12 (12 outlets, outdoor), PHC-24 (24 outlets, outdoor) |
3 variants: 4-zone (4 outlets), 8-zone (8 outlets), 16-zone (16 outlets), |
2 variants: 57985 (8 outlets, outdoor), 57995 (16 outlets, outdoor) |
Number of connectable solenoid valves | 6, 12 or 24 | 4, 8 or 16 | 8 or 16 |
Can be used with 24 volt or 9 volt solenoid valves | 24 Volt | 24 Volt | 24 Volt |
Programming option | 6 programs can be set, with up to 6 start times | Up to 16 programs (“schedules”) | 4 programs can be set, with up to 4 start times |
Watering duration | 1 to 1,440 minutes | 1 to 600 minutes | 1 to 240 minutes |
Global increase/decrease of duration | 0 to 200% | 0 to 200% | No |
WiFi? | Yes | Yes | Yes |
Connectable sensors | 2 | 1 | 1 |
Electricity/battery | Electricity | Electricity | Electricity |
Finally, a tip for all those who are interested in an open source irrigation computer with extensive customization options for both hardware and software.
OpenSprinkler 3.2 | |
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Model variants | 3 variants: 24V AC (for 24V AC valves), 7.5 V DC (for 24V AC valves and 7.5V to 12V DC valves), 7.5 V DC latch (for 7.5V to 12V DC latch valves) |
Number of connectable solenoid valves | 8 (can be expanded by 16 additional zones with an additional module, a maximum of 4 additional modules can be connected, the maximum number of zones is therefore 72) |
Can be used with 24 volt or 9 volt solenoid valves | 24 Volt/9 Volt (depending on the model) |
Programming option | Up to 40 programs can be set, with which the defined zones can be controlled, up to 4 start times can be defined for each program on one day. A special feature of OpenSprinkler is that several zones can be started at the same time. |
Watering duration | 1 second to 1,080 minutes |
Global increase/decrease of duration | 1 to 250% |
WiFi? | Yes |
Connectable sensors | 2 |
Electricity/battery | Electricity |
Indoor/Outdoor | Indoor |
Special feature | An IP 65 housing can be purchased separately for weather-protected outdoor use |
Price | From 150 to 200 USD |
Buy at | Opensprinkler.com |
Rain Bird and Hunter WiFi module
Below is a brief presentation of the expansion modules that can be used to make some of the Rain Bird irrigation computers or the Hunter X2 web-enabled.
Rain Bird LNK WiFi Modul | Hunter Wand Modul | |
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Hunter WAND Smart WiFi...23% OffSMART WIFI MODULE FOR X2 CONTROLLERS: Convert your Hunter X2 into a smart sprinkler system. Use the Hydrawise app for full remote access, scheduling, and water saving control. RELIABLE 2.4GHZ WI-FI + BLUETOOTH SETUP: Connect via 2.4GHz Wi-Fi (802.11 ... read more
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Thats how it works | The module is simply plugged into the designated slot on the irrigation computer and set up using an app (Android, iOS) | The module is simply plugged into the designated slot on the irrigation computer and set up using an app (Android, iOS) |
Usable with the following models | Rain Bird ESP-EZX, Rain Bird ESP-TM2, Rain Bird ESP-ME, Rain Bird ESP-ME3 | Hunter X2 |
Battery operated irrigation computers
Hunter offers the XC hybrid here, which is almost identical in construction to the X-Core, but also only works with a battery. The performance data is also the same as that of the X-Core. From Rain Bird there is the battery-controlled WP series. All of these models will only work with 9 volt DC solenoid valves.
Hunter XC Hybrid | |
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Hunter Sprinkler XCH60...5% OffReady for outdoor or indoor installation, the XC Hybrid comes in 4, 6, 8, 10 and 12 station plastic models That means it's the right solution for a wide range of residential and commercial applications Operates with DC latching solenoids only!
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Model variants | 6 variants:
XCH-600 (6 outlets, outdoor), |
Number of connectable solenoid valves | 6 or 12 |
Can be used with 24 volt or 9 volt solenoid valves | 9 Volt |
Programming option | 3 programs with up to 4 start times can be defined |
Watering duration | 1 to 240 minutes |
Global increase/decrease of duration | 10 to 150% |
WiFi? | No |
Connectable sensors | 1 |
Electricity/battery | Both |
Indoor/Outdoor | Outdoor |
Special feature | Hybrid model, which can alternatively also be operated with electricity. Instead of batteries, an optionally available solar panel can also be used for the energy supply: Hunter Sprinkler SPXCH Solar Panel |
Compact battery models for use in the valve box
Rain Bird, Orbit, Hunter and others also offer very small, handy, battery-operated computers with which the solenoid valves are controlled directly from the valve box. The Hunter Node and the Orbit battery operated controller are programmed directly on the device. The Rain Bird TBOS-BT cannot be programmed directly via the device. Instead, they can be programmed via a Bluetooth connection via a mobile phone app. A programming part is also available for the Rain Bird TBOS-BT if you prefer to use it for programming. Programming via Bluetooth connection also has the advantage that you do not have to open the valve box to make program changes and that you can start irrigation from your cell phone (if it is within Bluetooth range of the water computer). The Galcon 6100 series can be programmed directly on the device or via a mobile app with Bluetooth.
The Rain Bird TBOS-BT is placed in the valve box and can control 1 to 6 valves depending on the model. The Hunter Node and the Galcon 6100 can also control 1 to 6 valves and can be mounted directly onto a solenoid valve, as well as The Orbit battery operated controller which can control 4 valves.
Hunter Node | Orbit Battery-Operated Controller | Galcon 6100 series | |
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Hunter Node 100 Batter...INSTALLS IN MINUTES NO CONTROLLER OR WIRING NEEDED: Includes a pre-wired solenoid for fast connection to most irrigation valves. No trenching, controller box, or extra components required. Mounts directly to the valve for easy DIY or professional ins... read more
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Orbit 57865 Battery-Op...For battery-powered operation of up to 4 automatic sprinkler or drip valves Engineered with high degree of water and dust resistance for outdoor locations Comes standard with one solenoid, adapters for a variety of 24 VAC valves, and mounting bracket... read more
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Galcon 61042 DC Zone S...$134.95 (as of 27. July 2025 10:09 GMT +02:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.) |
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Model variants | 4 variants: BT-01 (1 outlet), BT-02 (2 outlets), BT-04 (4 outlets), BT-06 (6 outlets) |
1 | 4 variants: 6101 (1 outlet), 6102 (2 outlets), 6104 (4 outlets), 6106 (6 outlets) |
Number of connectable solenoid valves | 1, 2, 4 or 6 | 4 | 1, 2, 4 or 6 |
Can be used with 24 volt or 9 volt solenoid valves | 9 Volt | 9 Volt | 9 Volt |
Programming option | 3 programs with up to 8 start times can be defined | Up to 8 start times can be defined | Up to 4 start times can be defined |
Watering duration | 1 to 720 minutes | 1 to 240 minutes | 1 to 720 minutes |
Global increase/decrease of duration | 0 to 300% | 10 to 200% | 10 to 190% |
WiFi? | No | No | No |
Connectable sensors | 1 | 1 | 1 |
Electricity/Battery | Battery | Battery | Battery |
Indoor/Outdoor | Outdoor | Outdoor | Outdoor |
Special feature | Programming not directly on the computer, but via mobile phone app via Bluetooth or with a separately available programming tool | Programming directly on the computer or via mobile phone app via Bluetooth | |
Price | From 100 to 250 USD | About 80 USD | From 100 to 250 USD |