Suburban 2591A RV Furnace – SF-42VHFQ Series, 40,000 BTU Ducted Furnace (Multi-Position)

Maximum Heating Power with Flexible Installation and Interior Access

The Suburban 2591A SF-42VHFQ furnace is a high-output 40,000 BTU LP gas RV furnace designed for powerful, ducted heating in large RVs and four-season applications. Built on Suburban’s VHFQ platform, this furnace offers multi-position installation (vertical or horizontal) along with a front gas connection for interior access, eliminating the need for an exterior access door.

With direct spark ignition and a low amp draw design, the SF-42VHFQ delivers efficient, reliable heating while helping conserve battery power.

Who This Furnace Is Best For

This furnace is ideal for RV owners who need maximum heating performance and installation flexibility:

• Owners of large travel trailers, fifth wheels, and motorhomes
• RVs requiring 40,000 BTU output for cold-weather or four-season use
• Installations needing vertical or horizontal mounting flexibility
• Systems requiring ducted heating for whole-RV airflow
• Customers replacing an older SF-42, SF-42Q, or SF-42F furnace
• RVers looking for interior access with no exterior furnace door required
• Users wanting strong heating performance with lower amp draw efficiency

This model is especially well-suited for large or multi-room RVs where consistent, high-output heat is essential.

Features & Benefits

40,000 BTU heating capacity for large RVs

Multi-position installation (vertical or horizontal)

Ducted design for even heat distribution

Front gas connection for interior access

No exterior access door required

Direct spark ignition for reliable startups

Low amp draw for improved energy efficiency

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

Backed by a limited 2-year warranty

Specifications

Brand: Suburban

Part Number: 2591A

Series: SF-FQ (VHFQ configuration)

Model: SF-42VHFQ

Fuel Type: LP Gas

BTU Output: 40,000 BTU

Installation Type: Multi-position (vertical or horizontal)

Ducting: Ducted

Amp Draw: Low amp draw design

Height: 7-1/2 Inches

Width: 12 Inches

Depth: 20 Inches

Weight: 35 Pounds

Ignition Type: Direct spark ignition

Access Door: Not required

Warranty: Limited 2 year

Why Choose the SF-42VHFQ?

Compared to smaller or single-stage furnaces, the SF-42VHFQ offers:

• Maximum heating output for larger RVs
• Flexible installation with multi-position capability
• Interior service access with no exterior panel
• Efficient operation with reduced power draw
• Reliable performance in extreme cold conditions

This makes it a top-tier option for RV owners who demand maximum performance, efficiency, and flexibility.

When Do You Need to Replace Your Furnace?

Consider upgrading if you experience:

• Inadequate heating in larger RV spaces
• Uneven temperatures across multiple rooms
• High power consumption from older furnaces
• Frequent ignition or cycling issues
• Aging furnace unable to keep up in cold weather

Pro Tip

For optimal performance in large RVs, ensure your duct system is properly sized and sealed. Even high-output furnaces like the SF-42VHFQ rely on efficient ducting to distribute heat evenly.

FAQ

Q: Can this furnace be installed vertically or horizontally?
A: Yes. The SF-42VHFQ is designed for multi-position installation.

Q: Does this require an exterior access door?
A: No. This model is designed for interior access and does not require an exterior door.

Q: Is this furnace ducted?
A: Yes. It is designed for ducted heating systems to provide even airflow throughout your RV.