Rheem-Ruud SP11798B Thermostat & High Limit

The Rheem-Ruud SP11798B Thermostat & High Limit assembly is a critical OEM replacement component designed for precision temperature regulation and safety in commercial gas water heaters. Built on the Honeywell L8100B series architecture, this kit provides a thermostat adjustment range of 100°F to 180°F with a tight +/- 7°F tolerance, ensuring consistent thermal output. The integrated high limit switch is factory-set to trip at 192°F, offering essential over-temperature protection to prevent vessel damage. For technicians managing high-demand systems, the 39-1/4 inch capillary tube length and 3/4 inch NPT threaded insertion well allow for versatile installation across various tank geometries. Rated for pressures up to 255 PSI, this ProTech water heater kit is a direct fit for brands including Rheem, Ruud, Richmond, and Friedrich. Ensure the 5-inch lower well and 3-inch upper well insertion depths match your specific commercial water heater parts requirements to maintain system integrity and avoid nuisance tripping in high-recovery applications.

• Dual-Function Control: Combines adjustable water heater temperature control and a fixed 192°F manual reset high limit in a single Honeywell L8100B housing.
• Extensive Compatibility: Engineered as a genuine OEM replacement for Rheem, Ruud, and Richmond commercial gas units, specifically models like the G75-125 and G100-200.
• Durable Construction: Features a robust 39-1/4 inch capillary and a 255 PSI rated insertion well to withstand the rigors of commercial mechanical rooms.
• Precise Calibration: Maintains a 5°F differential for the thermostat and an 85°F differential for the high limit to optimize burner cycles.

Is the SP11798B compatible with residential water heaters?
This high limit thermostat kit is specifically engineered for commercial gas water heaters. Always verify your specific model number, as commercial controls operate on different temperature curves and pressure ratings than residential equivalents.

What is the maximum pressure rating for the insertion well?
The included 3/4 inch NPT threaded insertion well is rated for a maximum pressure of 255 PSI, making it suitable for high-pressure commercial plumbing architectures.

Can the high limit setting be adjusted in the field?
No, the high limit setting is fixed at 192°F for safety compliance. Only the primary thermostat range is adjustable between 100°F and 180°F using the internal dial.

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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.