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Dometic DFLD 40121 Large Furnace
Door-less Furnace 40,000 BTU, Uses LP Gas, DC Voltage

Engineered for easy maintenance and superior air delivery. Its compact size offers installation convenience. The Dometic DFLD 40121 Large Furnace now comes with a durable stamped steel door that is built to last (select models only).
  • Low-profile
  • Quiet
  • Flexible installation : 9108923366 (38355) Visit support page + FAQ
Dometic DFLD 40121 Large Furnace
...and more
    • Horizontal or vertical configuration for flexible installation
    • Quiet operation thanks to reduced air turbulence
    • Low-profile, compact design: 9 in. x 16-1/2 in. x 20 in (H x W x D)
    • 12 V DC powered unit
    • 40,000 BTU

Stay warm without being disturbed

The Dometic 40,000 BTU Large Furnace boasts a quiet operation thanks to reduced air turbulence. For easy and flexible installation, it may be placed vertically or horizontally. With the most duct configurations on the market, you can distribute heat exactly as you need it. Access door and thermostat sold separately. Please ensure the existing cutout will accommodate this model.


SKU number 9108923366 
Model DFL 
Model on label DFLD40121 
Scope of delivery Furance, Duct Adaptors and Manual 
Product Description Door-less Furnace 40,000 BTU, Uses LP Gas, DC Voltage 
Dimensions product depth 508 mm
Dimensions product height 228.6 mm
Dimensions product width 419.1 mm
Net weight 16.1 kg
Input voltage (DC) 12 V
Fuel type Liquid gas LPG 
Fuel consumption peak 424.8 l/h
Certificates ETL 
EAN-13 0713814220945 
Dimensions parcel depth 666.75 mm
Dimensions parcel height 337.82 mm
Dimensions parcel width 514.35 mm
Parcel weight 16.1 kg
WARNING This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to