RHEEM Control Board For Tankless Water Heater RTG20316U

Genuine OEM Rheem/Ruud printed circuit board (PCB) / main control board designed as a direct-fit replacement for compatible Rheem Prestige series high-efficiency condensing combi boilers (and related tankless systems that use this board). It serves as the central electronic control module that manages ignition, combustion modulation, temperature regulation, fan/blower operation, gas valve control, sensor inputs, safety interlocks, and system diagnostics/error code display.

Key Features

• Factory-original Rheem PCB for precise OEM performance and reliable system communication
• Controls critical functions including burner modulation, flame sensing, water temperature regulation (via thermistor feedback), pre-purge/post-purge timing, and safety shutdowns
• Supports diagnostic error code reporting to aid troubleshooting
• Direct-fit design that integrates with existing wiring harnesses, sensors, and control interfaces without modification (when installed on compatible units)
• Multi-application capability for residential and light commercial use

Benefits

• Restores full operational control and efficiency after board failure, loose connections, or related fault codes
• Maintains original manufacturer performance, safety standards, and energy-efficient modulation
• Helps prevent secondary issues from improper aftermarket substitutes
• Enables continued reliable domestic hot water (DHW) production and space heating (on combi models)
• Supports straightforward professional replacement to minimize downtime

Specifications

• Part Number: RTG20316U
• Manufacturer: Rheem (also listed under Rheem-Ruud)
• Type: Main Printed Circuit Board (PCB) / System Control Board
• UPC: 662766653564
• Weight: Approximately 5 lbs (2.27 kg)
• Application Class: Residential / Commercial repair part
• Color: Multi
• Dimensions of the board itself are not published in standard catalogs (typical control board form factor for these units; confirm physical fit against the original during installation). Shipping/packaged dimensions vary by supplier.

Compatibility

Primarily listed for Rheem Prestige high-efficiency condensing combi boilers (models that use the RTG20316 series case/parts family), including units such as the RCBH180DVLN / RCBH199DVLN series and similar RTG20316-platform appliances that provide both domestic hot water and hydronic space heating.

It appears in official parts diagrams as the primary PCB (item typically referenced with associated bracket RTG20316BE and case components). Always verify exact compatibility by matching the original part number on your unit’s existing control board or consulting the model-specific parts list / service manual, as Rheem tankless and combi boards are model-specific. Not a universal board for all Rheem tankless heaters (many other RTG/RTGH series use different board numbers such as RTG20239*, RTG20223*, etc.).

Important notes: Installation should be performed by a qualified technician. Power must be disconnected, wiring orientation carefully noted before removal, and any required programming chips or dip-switch settings (if applicable to the model) transferred or configured per the service manual. Professional installation helps ensure proper operation and preserves any remaining warranty coverage.

This is a genuine Rheem OEM replacement part intended to restore reliable performance on compatible equipment.