Intermatic EH10 Timer

The Intermatic EH10 is a heavy-duty 120V SPST digital water heater timer designed for precise load management in residential and commercial applications. Engineered for contractors, this electronic time switch provides to-the-minute accuracy for up to 42 ON/OFF events per week, allowing for sophisticated scheduling across 7 days. It features a 30 Amp resistive rating and a 1 HP motor rating, making it the industry standard for 120-volt electric water heaters. The NEMA 1 indoor metal enclosure includes 1/2-inch and 3/4-inch knockouts for streamlined conduit runs, while the external override switch and LED load indicator allow for local manual control and status verification without opening the cabinet. For reliability during power outages, the unit utilizes a replaceable AA battery backup to maintain programmed settings, ensuring consistent energy savings by shifting high-draw electrical use to off-peak periods.

Key Benefits for Professionals

• High Amperage Rating: Rated for 30 Amps (resistive/inductive) at 120 VAC, handling substantial heating loads and small motors with ease.
• Flexible Programming: Supports daily, 5-day work week, or individual 7-day schedules to match specific user demand patterns.
• Simplified Maintenance: Equipped with a replaceable battery to preserve the digital timer memory, reducing the need for site visits after local grid failures.
• Manual Override: Features an integrated external switch for immediate manual bypass, essential for testing or temporary hot water requirements.
• Durable Construction: Housed in a lockable Type 1 steel enclosure with 180-degree swing-open door for easy terminal access.

Common Questions

Is the Intermatic EH10 compatible with 240V water heaters?
No, the EH10 is specifically a 120V AC model. For 240V applications, use the Intermatic EH40. Always verify your supply voltage at the circuit breaker before installation.

What wire size should be used for the EH10 terminals?
To maintain safety and performance, use only #14 AWG to #10 AWG copper conductors. Ensure all teeter-type terminal screws are torqued tightly to prevent arcing.

How long will the battery backup maintain the program?
The AA alkaline battery typically provides up to 3 years of backup protection for the internal clock and programmed events during power loss.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.