Suburban 2558A RV Furnace – SF-30FQ Series, 30,000 BTU Two-Stage Ducted Furnace

Powerful, Efficient Heating with Two-Stage Performance

The Suburban 2558A SF-30FQ furnace is a 30,000 BTU LP gas RV furnace designed for high-performance ducted heating in mid- to large-size RVs. Featuring two-stage heating, this furnace delivers improved comfort by adjusting output based on demand—providing steady, efficient heat while reducing temperature swings.

Built on Suburban’s “FQ” platform, the SF-30FQ includes a front gas connection for interior access and does not require an exterior access door, making it ideal for modern RV installations.

Who This Furnace Is Best For

This furnace is ideal for RV owners who need strong, efficient heating with advanced comfort control:

• Owners of larger travel trailers, fifth wheels, and motorhomes
• RVs with ducted heating systems requiring higher BTU output
• Customers replacing an older SF-30, SF-30Q, or SF-30F furnace
• Installations requiring interior access (no exterior furnace door)
• RVers looking for more consistent temperatures with fewer hot/cold swings

This model is especially appealing for four-season RV use, where consistent and efficient heating is critical.

Features & Benefits

30,000 BTU heating capacity for larger RVs

Two-stage heating for improved temperature control and efficiency

Side ducted design for consistent airflow distribution

Front gas connection for interior installation access

No exterior access door required

Compact, low-profile cabinet (7-1/2 inch height)

Reliable operation in cold-weather conditions

Specifications

Brand: Suburban

Part Number: 2558A

Series: SF-FQ

Model: SF-30FQ

Fuel Type: LP Gas

BTU Output: 30,000 BTU

Heating Type: Two-stage

Amp Draw: 8.5 Amps

Height: 7-1/2 Inches

Width: 17 Inches

Depth: 20 Inches

Ducting: Side ducted

Gas Connection: Front (interior access)

Installation Type: Ducted furnace

Why Choose the SF-30FQ?

Compared to single-stage furnaces, the SF-30FQ offers:

• More consistent interior temperatures
• Reduced cycling and improved comfort
• Better energy efficiency under varying conditions
• Quiet, steady operation
• Flexible installation with interior service access

It’s an excellent upgrade for RV owners looking to improve both comfort and performance.

When Do You Need to Replace Your Furnace?

Consider upgrading if you experience:

• Uneven heating or temperature swings
• Furnace running constantly or short cycling
• Excessive noise or vibration
• Aging furnace struggling to heat larger spaces
• Desire for improved efficiency and comfort

Pro Tip

Two-stage furnaces perform best when paired with a properly functioning thermostat and well-sealed ductwork. Ensuring your system is balanced will maximize comfort and efficiency.

FAQ

Q: What is a two-stage furnace?
A: A two-stage furnace adjusts heat output based on demand, providing more consistent temperatures and improved efficiency compared to single-stage units.

Q: Does this require an exterior access door?
A: No. The SF-30FQ is designed for interior access and does not require an exterior door.

Q: Is this a ducted furnace?
A: Yes. It is designed for side ducted airflow and whole-RV heating.