Rheem-Ruud SP20794 Ignitor

The Rheem-Ruud SP20794 Ignitor is a Direct Spark Ignition (DSI) electrode designed for precise combustion control in high-efficiency gas furnaces and water heaters. As a veteran-grade OEM replacement part, this spark electrode ensures a consistent arc to the burner, preventing delayed ignition and nuisance furnace lockout codes. The assembly is built to withstand high-cycle thermal stress, maintaining its structural integrity in demanding 24V or 120V ignition circuits. This kit serves as a direct upgrade for the SP15128, featuring a redesigned ceramic insulator that resists carbon tracking and moisture fouling. By replacing a cracked or oxidized hot surface ignitor or worn electrode with this genuine Rheem part, contractors can restore factory-spec HVAC ignition system timing. The inclusion of a high-temperature gasket and mounting screws ensures a hermetic seal, preventing combustion gas leakage at the mounting bracket interface.

Key Benefits

• Includes a replacement gasket and mounting screws for a secure, airtight installation.
• Engineered as a genuine OEM replacement for a 1:1 fit in Rheem, Ruud, and WeatherKing equipment.
• Dual-function spark electrode design facilitates both ignition and flame rectification in specific control modules.
• High-grade ceramic insulation prevents voltage leakage to the chassis, ensuring a stronger spark at the burner assembly.
• Directly replaces legacy part number SP15128 for streamlined inventory management.

Common Questions

What causes a DSI ignitor to fail in Rheer-Ruud systems?
Cracked ceramic insulators or excessive carbon buildup on the electrode tip are the most common failure points. These issues often lead to intermittent spark or failure to sense the flame, resulting in the control board cutting gas flow for safety.

Is the SP20794 compatible with all Rheem gas furnaces?
While this Rheem ignitor fits a wide range of R95PA and similar high-efficiency models, always verify the specific electrode geometry and mounting pattern against your model and serial number before installation.

How do I test if the ignitor is the problem?
Visually inspect for hairline cracks in the porcelain. If the module is sending voltage but no spark occurs at the gap, or if the spark is jumping to the bracket instead of the burner, the insulator has likely failed and the assembly must be replaced.

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.