Rheem SP210245 Upper Thermostat – Replacement Control for Marathon Electric Water Heaters
The Rheem® SP210245 is a factory replacement upper thermostat designed specifically for use in 50-gallon and 85-gallon Marathon series electric water heaters. This component is responsible for regulating upper element activation and includes an integrated manual reset high-limit safety feature.
Product Application
This thermostat is intended for use with non-simultaneous operation electric water heaters that require dual-element control. The SP210245 allows precise temperature adjustment and includes a bimetallic disc sensor for consistent thermal response. It is designed to maintain system efficiency and meet OEM service requirements.
Performance Features
- Temperature Range: 80°F – 140°F – Supports standard residential setpoints for water heating systems.
- Manual High-Limit Reset – Integrated safety mechanism protects against overheating conditions.
- DPST Contact Configuration – Supports direct switching of the upper heating element with reliable contact integrity.
- Designed for OEM Fit – Manufactured for compatibility with Marathon 50- and 85-gallon electric water heater models.
Technical Specifications
- Part Number: SP210245
- Application: Upper thermostat for dual-element electric water heaters
- Compatibility: Rheem Marathon 50-gallon and 85-gallon models
- Temperature Adjustment: 80°F to 140°F (bimetal disc)
- High-Limit Protection: Manual reset
- Switch Type: DPST
- Materials: Metal/Plastic composite housing
- Color: Black
Installation Guidance
Installation of the SP210245 should be performed by qualified personnel familiar with water heater wiring and code requirements. Ensure power is disconnected prior to service. Thermostat mounts in standard Marathon water heater brackets and connects using factory-style terminals. Verify electrical continuity and reset switch function after installation.
Contractor Notes
This thermostat is a direct replacement part for Marathon-series water heaters and is often used during scheduled service or high-limit fault troubleshooting. Proper configuration and terminal labeling are important to maintain safe system operation. Temperature calibration should be verified following installation.
