Suburban 2605A Furnace Core – RP-20Q – SF-20 / SF-20Q – 20,000 BTU

Product Overview

The Suburban 2605A Furnace Core (RP-20Q) is a direct replacement heating core designed for Suburban SF and SF-Q Series furnaces, including SF-20 and SF-20Q models. This complete internal furnace module restores proper heating performance by replacing worn or damaged components.

With a 20,000 BTU output and compatibility with electronic ignition systems, this furnace core provides a fast and cost-effective way to bring your RV furnace back to life—without replacing the entire unit.

This core is designed to slide directly into your existing furnace cabinet, simplifying installation and reducing downtime.

Key Features & Benefits

• Direct replacement for Suburban part #2605A
• Compatible with SF-20 and SF-20Q furnaces
• Restores full furnace heating performance and efficiency
• 20,000 BTU output for reliable RV heating
• Designed for electronic ignition systems
• Complete core assembly simplifies installation
• Cost-effective alternative to full furnace replacement

Compatibility

Compatible with the following Suburban furnace models:

• SF-20
• SF-20Q

Replaces:

• RP-20Q Furnace Core Assembly

Product Specifications

• Part Number: 2605A
• Model: RP-20Q
• BTU Rating: 20,000 BTU
• Ignition Type: Electronic Ignition
• Dimensions:
  • Height: 7-1/2 inches
  • Width: 12 inches
  • Depth: 20 inches
• Application: Suburban SF & SF-Q Series Furnaces

What’s Included

• (1) Suburban 2605A Furnace Core Assembly (RP-20Q)

Note: Furnace cores are sold as a complete internal module and do not include the outer cabinet housing 

Common Issues This Part Solves

• Furnace blowing cold air
• Weak or inconsistent heat output
• Cracked or failing heat exchanger/core
• Furnace short cycling or overheating
• Aging or worn internal furnace components

Installation Notes

• Professional installation is recommended
• Verify compatibility with your furnace model before purchase
• Disconnect power and gas supply prior to installation
• Follow all Suburban safety and service guidelines

Why Replace the Furnace Core Instead of the Whole Furnace?

Replacing the furnace core allows you to restore your RV furnace’s performance at a fraction of the cost of a full replacement. The Suburban 2605A is designed as a complete replacement module, making installation faster and more efficient while maintaining OEM-level performance.

Frequently Asked Questions (FAQ)

Q: Will this work with both SF and SF-Q models?
A: Yes, this furnace core is compatible with SF-20 and SF-20Q models.

Q: What does the “Q” mean in SF-20Q?
A: “Q” indicates a quiet operation furnace, but this core works with both standard and quiet versions in this size.

Q: Is this a complete furnace?
A: No, this is the internal furnace core assembly only, not a full furnace unit.

Q: Does this include the control board?
A: Many Suburban furnace cores include the control board as part of the assembly, simplifying installation.