Leak Sensor & Shut Off Valve Kit

Rheem SP21111 Leak Sensor and Shut-Off Valve Kit – Replacement Assembly for Hybrid Electric Water Heaters

The Rheem SP21111 is a factory-authorized replacement kit that includes a leak detection sensor and electronically actuated shut-off valve, designed specifically for Rheem hybrid electric heat pump water heaters. This assembly is essential for maintaining the water heater’s integrated leak mitigation system, which limits potential water damage by detecting leaks and triggering an automatic shut-off of the water supply.

This kit restores factory functionality in models equipped with leak protection capabilities and is required when replacing a failed sensor or valve component. Installation ensures the continued performance of the water heater’s built-in safety features, as originally engineered by Rheem.

System Function and Benefits

• Automatic Response: Shuts off water flow once the internal sensor detects moisture beyond the programmed threshold
• Leak Limiting Capacity: Restricts water release to approximately 20 oz. during activation, helping mitigate floor or structural damage
• Precision Fit: Designed specifically for Rheem hybrid models, providing seamless replacement and system integration
• Genuine OEM Assembly: Maintains UL certification and warranty eligibility when installed per manufacturer guidelines

Kit Contents

• Leak Sensor (AP15304-1)
• Shut-Off Valve (AP15303-1)
• Wire Harness & Connector Assembly
• Mounting Hardware & Seal Components
• Installation Instructions

Technical Specifications

• Part Number: SP21111
• Application: Hybrid electric (heat pump) water heaters equipped with leak protection
• Activation Volume: Leak containment threshold: ≤ 20 oz.
• Connection Type: Quick-connect harness and threaded valve interface
• Installation: Field-replaceable with basic tools; professional installation recommended

Installation Guidance

This replacement should be completed with the unit powered off and isolated from the plumbing system. Sensor placement should align with the original installation location to ensure accurate leak detection. The shut-off valve is typically installed on the cold water inlet and must be oriented for proper actuation and sealing. Ensure all connectors are properly seated and that the wire harness is secured clear of heat or moving components.

Although installation is mechanically simple, field replacement should follow all applicable electrical and plumbing codes. For warranty preservation and compliance, a licensed plumber or HVAC technician is recommended.

Professional Use Case Notes

• Warranty-Grade Repair: Maintains OEM leak protection performance for service contracts and code-required safety features
• Code Compliance: Supports AHRI-certified equipment standards with integrated leak containment
• Minimizes Service Interruptions: Helps reduce downtime from uncontrolled leak events, maintaining operational continuity

Summary

The Rheem SP21111 Leak Sensor and Shut-Off Valve Kit is a purpose-built replacement solution for restoring automated leak detection and water shut-off functionality in Rheem hybrid heat pump water heaters. Built to original specifications and backed by Rheem’s engineering standards, this kit ensures the continued performance and protection your system was designed to provide.