Williams Forsaire 40,000 BTU Propane, Direct Vent Counterflow Furnace, Intermittent Ignition

SAVE $1,558.29

Required Fields *

Be the first to review this product

Out of stock

Williams

Out of stock

Model

4007331 *

235532

5 Questions Answered

Description

THIS PRODUCT HAS BEEN DISCONTINUED BY THE MANUFACTURER

Forsaire Counterflow Furnace with Direct-Vent Counterflow, Intermittent Ignition - Propane

Powerful counterflow furnace delivers floor-to-ceiling heat circulation with flexible installation and multi-room heating capability for consistent home comfort

The Williams Forsaire Counterflow Furnaces are high-performance wall-mounted heating systems designed to circulate warm air from floor to ceiling for even, whole-room comfort. Built with an integrated blower and flexible installation options, these furnaces are ideal for homeowners looking to efficiently heat one or multiple rooms.

Key Benefits

40,000 BTU Heating Power Provides reliable heat output
Counterflow Heating Design Distributes heat evenly from floor to ceiling
Integrated Blower System Improves air circulation for faster comfort
Multi-Room Heating Capability Optional kits heat up to three rooms
Flexible Installation Options Surface mount or recessed wall installation
Direct or Top Vent Options Adaptable to different home layouts
Sealed Combustion (Direct Vent) Uses outside air for safer operation
Matchless Ignition System Easy, reliable pilot lighting
Built-In Safety Controls Includes vent safety shutoff protection

Floor-to-Ceiling Heat Circulation

The counterflow design pulls cooler air in from the top and delivers warm air near the floor, creating consistent, comfortable temperatures throughout the space.

Integrated Blower Performance

An internal blower enhances airflow and heat distribution, allowing the system to warm spaces faster and more evenly compared to gravity-style heaters.

Multi-Room Heating Flexibility

With optional outlet kits, this furnace can distribute heat into adjacent rooms, making it a versatile solution for whole-home or multi-zone comfort.

Flexible Installation Options

Designed for both recessed and surface-mounted installations, the Forsaire series adapts easily to different wall configurations and space requirements.

Direct Vent Safety Option

Direct vent models feature a sealed combustion chamber that uses outside air for combustion and vents exhaust gases outdoors, improving indoor air quality and safety.

Reliable Safety & Controls

Equipped with automatic temperature controls and a vent safety shutoff system, these furnaces help ensure safe and consistent operation in residential environments.

Warranty

The unit includes a 1-year limited warranty on components and an extended 10-year limited warranty on the combustion chamber when installed by a qualified professional.

Installation Disclaimer

Installation must be completed by a qualified installer and comply with all local codes. Improper installation can void the warranty and impact safe operation.

Product Specs

More Information
Williams Forsaire 40,000 BTU Natural Gas, Direct Vent Counterflow Furnaces, Intermittent Ignition
Feature	Spec
SKU	4007332
Weight (in lbs)	126
Brand/Manufacturer	Williams
UPC	93909299323
Furnace Efficiency / AFUE	75-79%
Heating BTU	40,000
Maximum CFM	325
Venting Type	Direct Vent
Ignition Type	Electronic
Fuel Type	Natural Gas
Certification	CSA
Color	White
Mounting Type	Recessed / Surface Wall Mount
Height	77.375"
Width	14.125"
Depth	11.75"
Location	Indoor
Warranty	10 Year Limited Warranty on Combustion Chamber, 1 Year on All Other Parts
Resources	Product Manual Product Specification Sheet You will need AdobeÂ® AcrobatÂ® Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9806 Vent Tubes for Direct-Vent Furnaces 12”
Feature	Spec
SKU	9806
Weight (in lbs)	8
Brand/Manufacturer	Williams
UPC	93909049157
Height	12"
Width	12"
Depth	12"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Gas Conversion Kit 7729 - Propane Gas to Natural Gas for 4007731 and 4007331
Feature	Spec
SKU	7729
Weight (in lbs)	1
Brand/Manufacturer	Williams
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 8967 Millivolt Wall Thermostat Kit for all Williams Heaters
Feature	Spec
SKU	8967
Weight (in lbs)	0.63
Brand/Manufacturer	Williams
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams P322016 Millivolt Thermostat
Feature	Spec
SKU	P322016
Weight (in lbs)	1
Brand/Manufacturer	Williams
UPC	93909020590
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9940 Hard-Wire Converter for Forsaire Models
Feature	Spec
SKU	9940
Weight (in lbs)	1
Brand/Manufacturer	Williams
UPC	93909041465
Height	1"
Width	10"
Depth	10"
Warranty	1-Year Limited Parts Warranty
Williams 7735 Forsaire Top Vent Limit Switch
Feature	Spec
SKU	7735
Weight (in lbs)	1
Brand/Manufacturer	Williams
Warranty	1-Year Limited Parts Warranty
Williams 7734 Forsaire Top Vent Limit Switch
Feature	Spec
SKU	7734
Weight (in lbs)	1
Brand/Manufacturer	Williams
Warranty	1-Year Limited Parts Warranty
Williams Trim Strip Accessory
Feature	Spec
SKU	4701
Weight (in lbs)	5
Brand/Manufacturer	Williams
UPC	93909001834
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9802 Vent Cap and Tubes for Direct-Vent Furnaces
Feature	Spec
SKU	9802
Weight (in lbs)	11
Brand/Manufacturer	Williams
UPC	93909042226
Height	11"
Width	11"
Depth	19"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9836 Vent Enclosure 36” Length for Forsaire Top-Vent
Feature	Spec
SKU	9836
Weight (in lbs)	12
Brand/Manufacturer	Williams
UPC	93909001865
Height	1.5"
Width	14.5"
Depth	36.5"
Warranty	1-Year Limited Parts Warranty
Williams 9824 Vent Enclosure, 24” Length for Forsaire Top-Vent
Feature	Spec
SKU	9824
Weight (in lbs)	8
Brand/Manufacturer	Williams
UPC	93909003722
Height	1.5"
Width	14.5"
Depth	24.5"
Warranty	1-Year Limited Parts Warranty
Williams 9812 Vent Enclosure, 12” Length for Forsaire Top-Vent
Feature	Spec
SKU	9812
Weight (in lbs)	4
Brand/Manufacturer	Williams
UPC	93909001841
Height	1.5"
Width	12.5"
Depth	14.5"
Warranty	1-Year Limited Parts Warranty
Williams 9307 Thin-Wall Collar Kit
Feature	Spec
SKU	9307
Weight (in lbs)	3.5
Brand/Manufacturer	Williams
UPC	93909001698
Height	3"
Width	9.5"
Depth	14.5"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 4318 Vent Shield Deflector
Feature	Spec
SKU	4318
Weight (in lbs)	9
Brand/Manufacturer	Williams
UPC	93909042202
Height	5"
Width	5"
Depth	2"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9902 Vent Adapter without a Blower Installed
Feature	Spec
SKU	9902
Weight (in lbs)	3
Brand/Manufacturer	Williams
UPC	93909003999
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 9308 Direct Vent - Vent Cap Guard
Feature	Spec
SKU	9308
Weight (in lbs)	15
Brand/Manufacturer	Williams
UPC	93909001131
Length	12"
Height	8"
Width	12"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams Vent Starter Kit - 9929
Feature	Spec
SKU	9929
Weight (in lbs)	9.5
Brand/Manufacturer	Williams
Length	24"
Height	4"
Width	4"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6801 Rear Outlet Register with 10” Boot and Damper for Top-Vent Furnaces
Feature	Spec
SKU	6801
Weight (in lbs)	9.5
Brand/Manufacturer	Williams
UPC	93909003739
Height	12"
Width	10"
Depth	16"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6704 One-Way Diffusing Grille for all Forsaire Models
Feature	Spec
SKU	6704
Weight (in lbs)	2
Brand/Manufacturer	Williams
UPC	93909001827
Height	1"
Width	13.5"
Depth	14"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6703 Two-Way Diffusing Grille for all Forsaire Models
Feature	Spec
SKU	6703
Weight (in lbs)	2.5
Brand/Manufacturer	Williams
UPC	93909003753
Height	1"
Width	13.5"
Depth	14"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6702 Side Casing Grille for all Forsaire Top and Direct-Vent Furnaces
Feature	Spec
SKU	6702
Weight (in lbs)	2
Brand/Manufacturer	Williams
UPC	93909001902
Height	5.5"
Width	8"
Depth	10"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6701 Side Outlet Register with 10” Boot and Damper for Top- and Direct-Vent Furnaces
Feature	Spec
SKU	6701
Weight (in lbs)	11
Brand/Manufacturer	Williams
UPC	93909003746
Height	10.5"
Width	10.5"
Depth	36.5"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Williams 6802 Rear Outlet Register with 1" Boot and Damper
Feature	Spec
SKU	6802
Weight (in lbs)	5
Brand/Manufacturer	Williams
UPC	93909001889
Length	12"
Height	8"
Width	9"
Warranty	1-Year Limited Parts Warranty
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.

Reviews

Accessories

FAQ's

Customer Questions

What are the benefits of a counterflow furnace for home heating?

Hello, thank you for reaching out. These units distribute heat evenly by pushing warm air downward, has a compact design with durable construction and work to improve your overall comfort. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.

Are Forsaire furnaces suitable for different venting configurations?

Hello, thank you for reaching out. Yes, they are designed to support multiple venting setups for flexible installation, as you can pick between direct vent or top vent options. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.

Can Forsaire furnaces be used as a primary heating system?

Hello, thank you for reaching out. Yes, Williams Forsaire furnaces can be used as a primary heating system for many residential applications. They are commonly used as the main heat source in homes, cabins, apartments and other spaces where central HVAC systems cannot be installed. Although there are a few considerations: sizing is critical - the furnace must be properly sized based on the home's heating load, single-unit applications - smaller homes or open floor plans may use one Forsaire furnace as the primary heater, larger homes - multiple units may be required to provide even heating throughout the space, not a replacement for central HVAC in every application - homes that are needing extensive zoning, cooling integration or ducted air distribution may be better suited for a central system. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.

Do these furnaces maintain consistent airflow?

Hello, thank you for reaching out. Yes, the Forsaire furnaces work to circulate air effectively in order to reduce temperature imbalances. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.

Are Forsaire furnaces energy efficient?

Hello, thank you for reaching out. Yes, they are designed for reliable and efficient heating performance. Direct-vent or counterflow models use outside air for combustion which helps to improve efficiency & reduce the need for additional venting. If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.