Best Relay Switches for Water Pumps for Efficient Irrigation
Answering the common question, these relay switches automate irrigation pumps to ensure consistent water delivery while protecting equipment. The top picks below are best for homeowners, small farms, and gardeners who want reliable, weatherproof control that works with standard 110V or 220V pumps. Each product is chosen for durability, compatibility with common irrigation timers, and clear installation guidance. Use the quick comparison table to shortlist options that fit your system size and voltage needs.
| Product | Best For | Voltage Range | Horsepower Range |
|---|---|---|---|
| Orbit 57009 | Smaller to mid-size gardens | 120/230 VAC | Up to 2 HP (230V) |
| Briidea Irrigation Relay | Automated watering with robust enclosure | 120/230 VAC | Up to 5 HP (230V) |
| Deargooday 1522 | Versatile irrigation setups | 240 VAC max | Up to 3 HP |
| Bzcovac PSR110220 | Flexible, dual-voltage systems | 110/220 VAC | 3/4 to 5 HP |
| Stropum GL-1 | Reliable level-based control | 110 VAC | Depends on connected pump |
The five products below were selected for their balance of reliability, compatibility with irrigation timers, and practical features. Each section explains who should consider the product, why it fits typical setups, and any notable limitations.
Orbit 57009 2 HP Irrigation Pump Start Relay
Best for small to mid-size irrigation systems that require a simple, dependable pump start relay. The Orbit unit is designed to synchronize an irrigation pump with a sprinkler controller. It uses a durable ABS enclosure to withstand outdoor environments and supports 120 VAC pumps up to 1 HP and 230 VAC pumps up to 2 HP. This makes it suitable for residential lawns and small garden installations where a single water source feeds multiple zones. It is chosen for its straightforward installation and weather-resistant housing, which reduces service calls in exposed locations.
Best for: Homeowners with 120V systems or 230V pumps up to 2 HP who want a compact, reliable starter relay that won’t require complex wiring. Limitations: It does not specify enhanced automation features beyond pump-start synchronization, so users seeking advanced scheduling may prefer other models with broader control options.
Briidea Irrigation Pump Start Relay
Best for growers needing automatic control with durable, weatherproof protection. Briidea emphasizes intelligent control and automation features, ensuring precise start/stop actions to optimize water usage. The external casing is waterproof, and the internal relay is UL-certified, promoting dependable operation. It supports 120V pumps up to 2 HP and 230V pumps up to 5 HP, making it suitable for medium to larger irrigation setups that require stronger performance and longer service life in outdoor conditions.
Best for: Installations where automatic watering accuracy and weather resistance matter most. Limitations: The feature set focuses on automation and protection; users needing compact form factors or basic operation may find larger units less convenient to fit in tight spaces.
Deargooday 1522 Pump Start Relay
Best for versatile irrigation systems with a robust, weather-resistant enclosure. The 1522 model supports 3 HP at 110V or 220V with a 24V coil, offering a broad voltage compatibility range for different timer configurations. It’s designed to automatically synchronize a pump with a watering schedule, making it a practical choice for homeowners who oscillate between multiple zones or timers. Weatherproof enclosure and corrosion-resistant construction help ensure durability in outdoor installs.
Best for: Those needing a flexible voltage range and compatibility with various timer/controller setups. Limitations: The description emphasizes general compatibility; verify your timer’s output compatibility with the 24V coil requirement before purchase.
Bzcovac PSR110220 Dual Pole Relay
Best for flexible installations that require dual-voltage operation. The PSR110220 supports 110V or 220V single-phase pumps and covers a broad pump range from 3/4 HP to 5 HP. It uses a 40A relay for reliable operation in demanding conditions and comes with a weatherproof enclosure. This makes it a strong option for both small residential systems and larger irrigation setups where a single box can handle multiple configurations.
Best for: Installations needing dual-voltage capability and a higher HP range. Limitations: The dual-voltage feature requires proper wiring and protection; ensure your electrical setup matches the device’s configuration to avoid miswiring.
Stropum Automatic Water Level Controller
Best for systems where water level management is as important as pump control. The Stropum controller offers four modes and an automatic/manual switch to handle various water levels, preventing overflow and dry running. It monitors water levels and uses detector sensors for accurate readings, making it suitable for storage tanks, reservoirs, or ponds with mechanical pumps. The 110V operation aligns with many residential setups, and the unit is designed for long-term outdoor use.
Best for: Scenarios requiring automatic level-based control in addition to pump activation. Limitations: It focuses on level monitoring; pairing with a separate timer can optimize scheduling for multi-zone irrigation.
Buying Guide
Key considerations for choosing a relay switch for a water pump include voltage compatibility, horsepower range, enclosure durability, and integration with irrigation timers. If your system runs on 110V or 120V, choose a relay with a 110V listing; for 230V systems, verify HP support and enclosure protection against weather. Look for UL or equivalent safety certifications, UL-listed internal relays, and weatherproof housings for outdoor installs. For larger irrigation setups with multiple zones, dual-voltage or higher HP relays offer better scalability. If water levels are a concern, pairing a level controller with a pump relay can prevent overflow and dry-run conditions. Finally, ensure the wiring accessibility and knockouts fit your installation space and local electrical codes.
Frequently Asked Questions
- What is a pump start relay? A device that automatically activates a water pump when a sprinkler controller or timer requests water, protecting the pump from dry running and extending its life.
- Do I need a weatherproof enclosure? Yes if the relay will be used outdoors or in damp locations to prevent corrosion and electrical faults.
- Can I use 120V and 240V pumps with the same relay? Some models support dual voltage; verify the product specifications to ensure compatibility with your pumps.
- Is a level sensor necessary for irrigation? Not always, but it helps prevent overflow and dry running in tanks or reservoirs when used with a pump relay.
- How do I choose the right HP rating? Match the relay HP rating to the maximum horsepower of your pump to avoid relay failure and ensure reliable operation.
- Can these relays work with any sprinkler timer? Most are designed to work with common irrigation timers, but confirm voltage compatibility and output type with your timer’s controller.