Suburban | Replacement Furnace Core for SF-20/SF-20Q | 2605A | RP-20Q

Restore your Suburban RV furnace to factory operation without the hassle of replacing the whole unit using the Suburban Replacement Furnace Core (Part #2605A / Model RP-20Q). Instead of removing and repairing individual furnace components, simply slide this complete core module into your existing cabinet — getting you back to reliable heat with significantly less labor and cost than a full furnace replacement.

Why Replace the Core Instead of the Whole Furnace?

When a Suburban furnace fails, you have three options: replace components one by one (often diagnosing one fault, fixing it, then finding another), replace the entire furnace including the cabinet, or replace just the core. The furnace core is usually the smartest middle path:

• Faster installation than rebuilding a furnace component by component
• Lower cost than buying a complete new furnace with cabinet
• Reuses your existing cabinet — no cutting, no resealing, no removing the entire unit from the wall
• Restores like-new operation — you get a fresh blower, burner, controls, and heat exchanger

Compatibility

The 2605A is designed to fit seamlessly into Suburban SF-20 and SF-20Q series furnaces. Confirm your existing furnace series before ordering.

Wrong Series? Check the Gas Line

The key visual difference between this furnace core and the 2606A core (for SF-20F / SF-20FQ series) is the gas line connection location:

• SF-20 / SF-20Q (this 2605A core): gas line connects near the rear (exterior wall side)
• SF-20F / SF-20FQ (2606A core): gas line connects near the front (cabin side)

Look at where your existing gas line enters the furnace cabinet — that tells you which core you need.

20,000 BTU of Reliable Heat

The replacement core delivers the same 20,000 BTU heating capacity as the original furnace — keeping your rig comfortable in cool weather just as the OEM unit did.

Includes the Furnace Control Board

Importantly, the 2605A core includes the furnace control board — so if your existing furnace fault is in the controls (a common failure point), this replacement takes care of it without a separate purchase.

Please note: The furnace core does not include the cabinet assembly — it slides into your existing cabinet.

⚠️ Professional Installation Recommended

Suburban gas appliances should be installed and serviced by a qualified service technician. Improperly installed gas furnaces are a fire and carbon monoxide risk.

Key Features

• Complete furnace core replacement — slides into existing cabinet
• 20,000 BTU heating capacity
• Includes the furnace control board
• Fits Suburban SF-20 and SF-20Q series furnaces
• Cost-effective alternative to a full furnace replacement
• Time-saving installation compared to component-by-component repair
• Cabinet assembly not included (reuses your existing cabinet)
• Backed by a 2-year limited manufacturer warranty

Specifications

• Brand: Suburban
• Part Number: 2605A (Model RP-20Q)
• Type: Replacement RV Furnace Core (includes control board)
• BTU Level: 20,000 BTU
• Compatibility: Suburban SF-20 and SF-20Q series furnaces
• Includes Cabinet: No (reuses existing cabinet)
• Includes Control Board: Yes
• Dimensions: 17" W x 20" D x 7.5" H
• Warranty: 2-year limited manufacturer warranty