When it comes to automatic irrigation timers, two models stand out from Orbit: the 21004 and 21005. Both offer programmable watering schedules, multiple start times, and weatherproof construction.
However, there are some key differences between these timers that might make one a better choice for your needs. This article provides an in-depth comparison of the Orbit 21004 and 21005 timers, including an overview, pros and cons, and frequently asked questions.
A Brief Comparison Table
| Feature | Orbit 21004 | Orbit 21005 |
| Number of Zones | 4 | 4 or 6 |
| Number of Programs | 3 | 3 |
| Start Times Per Program | 4 | 4 |
| Max Run Time Per Zone | 4 hours | 12 hours |
| Weather Sensor Compatible | Yes | Yes |
| Independent Program Settings | Yes | Yes |
| Manual Watering | Yes | Yes |
| Cycle+Soak | Yes | Yes |
| Non-Volatile Memory | Yes | Yes |
| Warranty | 2 years | 2 years |
Overview of the Orbit 21004
The Orbit 21004 is a 4-zone indoor/outdoor timer with 3 independent programs and 4 start times per program. This allows you to set different watering schedules for each zone based on the specific needs of that area.
Some of the key features of the 21004 include:
- Runs up to 4 zones
- Each program can have 4 start times to run zones multiple times per day
- Max run time per zone is 4 hours
- Cycle+Soak feature helps prevent runoff
- Weather sensor port for suspending watering in rain
- Manual watering option for quick zone testing
- LCD display and simple dial programming
- Non-volatile memory retains settings after power loss
- Rain delay can suspend watering for up to 7 days
The 21004 timer is ideal for residential irrigation systems with a limited number of zones. It provides flexible scheduling so each zone can be programmed to match plant needs. The 4 hour max run time may be limiting for drip irrigation systems or very large areas.
Overview of the Orbit 21005
The Orbit 21005 offers all the same great features as the 21004, but with a few upgrades. The main differences include:
- Available in 4 or 6 zone models
- Max run time increased to 12 hours per zone
- Additional programmable features like seasonal adjustment
Some key features of the 21005:
- Runs 4 or 6 zones
- 3 programs with 4 start times
- 12 hour max run time
- Cycle+Soak and seasonal adjust
- Weather sensor input
- Manual watering and rain delay
- Simple dial programming
- Non-volatile memory
- 2 year warranty
With a 12 hour max run time and optional 6 zones, the 21005 can accommodate larger landscapes. The seasonal adjust provides global run time changes with the turn of a dial. Overall, the 21005 offers more flexibility and capability than the 21004.
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Key Differences Between the 21004 and 21005
While the Orbit 21004 and 21005 share many features, there are some important differences:
- Zones
The Orbit 21004 and 21005 models control different numbers of zones in your yard. A zone is an area where you can water separately from other areas. The 21004 model controls up to 4 zones. This means you can manage watering in four different areas of your yard independently.
However, the 21005 model gives you more flexibility. It can control 4 or 6 zones, allowing you to manage water in up to six different areas. This is especially useful for larger gardens or lawns with varied watering needs.
- Run Times
Run times refer to how long you can water each zone. The 21004 model has a max run time of 4 hours for each zone. This might be enough for smaller gardens. But, the 21005 model extends this to 12 hours.
This longer run time is beneficial for larger landscapes or areas with plants that need more water. It means you can water your plants for a longer time, ensuring they stay healthy and grow well.
- Programming
Programming features let you set how and when you want to water your plants. The 21005 model has an added feature called a seasonal adjust dial. This dial allows you to make global run time changes depending on the season.
For example, during the rainy season, you might want to water your plants less. The seasonal adjust dial makes this easy. The 21004 model does not have this feature, which means adjusting water schedules seasonally might be more manual and time-consuming.
- Display
A clear and easy-to-read display is essential for setting up and monitoring your watering schedules. The 21005 model has an improved LCD display that is easier to read compared to the 21004 model.
This means that with the 21005 model, you can more easily see the settings and make adjustments, ensuring your plants get the right amount of water.
- Water Budgeting
Water budgeting is about planning how much water each zone needs throughout the year. The 21005 model has programmable 365-day water budgeting. This feature allows you to set different water budgets for each day of the year.
This is especially handy as plants’ water needs change with the seasons. The 21004 model does not have this feature, so you would need to adjust water budgets manually.
- Solar Sync
Solar Sync is a feature that adjusts watering based on the weather. Only the 21005 model is compatible with the Solar Sync ET sensor. This sensor measures the environmental conditions and adjusts the watering accordingly.
This means that if it’s a hot and dry day, the sensor will tell the controller to water more. If it’s cool and rainy, it will water less. This feature helps in saving water and ensuring that plants are not over or under-watered.
- Panel
Both models have a feature for Rain Delay, but they handle it differently. The 21005 model has a Rain Delay panel that makes setting up rain delays more straightforward.
On the other hand, the 21004 model sets rain delay on the dial. The Rain Delay feature is important because it prevents watering when it’s raining, saving water and preventing over-watering of plants.
- Batteries
The two models use different types of batteries. The 21005 model uses 2 AA batteries, which are commonly available and easy to replace. The 21004 model, however, uses a 9V battery.
While both types of batteries are easy to find, AA batteries are often more readily available. This means that replacing batteries in the 21005 model might be a bit easier.
The 21005 has increased zone capability, much longer run times per zone, added programming features like seasonal adjust, and enhanced solar sync sensor integration. This makes the 21005 the preferable choice for larger, more complex landscapes.
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Pros and Cons of the Orbit 21004
Pros:
- Affordable and budget-friendly
- Easy dial programming
- 3 independent programs
- 4 start times allow multiple watering per day
- Manual watering option
- Weather sensor input suspends watering
- Cycle+Soak prevents runoff
- Non-volatile memory holds settings
Cons:
- Limited to 4 zones
- Only 4 hour max run time per zone
- No seasonal adjust dial
- Solar sync not compatible
- Smaller LCD display
- 9V battery can be inconvenient
Pros and Cons of the Orbit 21005
Pros:
- Available in 4 or 6 zones
- 12 hour max run time per zone
- Programmable 365-day water budgeting
- Seasonal adjustment dial
- Improved LCD display
- Solar Sync ET sensor compatible
- Rain Delay panel for one-touch rain delay
- 2 AA batteries are inexpensive & common
Cons:
- More expensive than 21004
- Additional features increase complexity
- No 9V battery compatibility
- Solar Sync sensor sold separately
Also Read: Choose Between Raindrip And Rainbird.
Frequently Asked Questions (FAQs)
A few common reasons a Bhive timer may not be working properly include: Power is out to the timer – Check breaker or transformer, Batteries are dead – Replace with fresh AA or 9V batteries, Loose wire connections – Check wiring to valves or power, Faulty solenoid or valve – Test valves manually to isolate issue, Programming is incorrect – Review programmed settings, Short circuit due to moisture – Allow timer to dry out completely.
To reset a Bhive timer: Remove battery cover and batteries. Wait 1 minute. Reinstall batteries.
Use dial to reset current time and date. Reset programs using dial and buttons. This process will clear all existing programs and reset the controller to factory default.
The fault program on Orbit timers temporarily suspends all scheduled watering for investigations and repairs. To activate: Press the Manual Single Station button. Turn dial to Fault position. Press Manual button once to activate Fault mode. This will stop all programmed watering. Once fault is resolved, turn dial out of Fault position to resume normal operation.
Common reasons an Orbit timer is flashing include: Power outage – Timer flash means it has lost power and time/date needs resetting. Fault mode active – Flashing indicates Fault mode is on, suspending all watering. Rain delay active – Flashing signals a rain delay is pausing watering schedules. Battery low – Flashing low battery icon indicates it’s time to replace batteries. Programming error – Re-check programmed run times, start times, and dates. Bad solenoid or short circuit – Flashing can mean a wiring issue is detected.
Final Thoughts
The Orbit 21004 and 21005 timers both offer user-friendly programming and reliable scheduling for residential irrigation. The 21004 is a budget-friendly option for small yards with limited zones.
For larger landscapes that need longer run times, seasonal adjustment, and weather sensor integration, the more robust 21005 is likely the better choice. Consider your specific needs and watering requirements to decide which of these quality Orbit timers is right for you.