Dometic DFSD 20111 18K BTU Compact RV Furnace | LP | 12V

Heat your small to mid-size RV efficiently with the Dometic DFSD 20111 18,000 BTU Small Furnace. This compact Dometic furnace is engineered specifically for smaller RVs where the larger 30K-40K BTU furnaces would be excessive and inefficient. With the most duct configurations on the market in this size class, the DFSD 20111 offers exceptional installation flexibility for cabinets, compartments, and small floor plans. The right pick for buyers with smaller RVs, travel trailers, or compact motorhomes who need genuine heating capacity without oversizing the system.

Compact Design with Maximum Duct Flexibility

The DFSD 20111's standout advantage is installation flexibility:

• Compact footprint — 12" W × 7" H × 20" D fits where larger furnaces simply can't
• Most duct configurations available in this size class — engineered for installation in spaces that other furnaces force you to work around
• Easy maintenance access from compact bays and tight installations
• Adapts to your RV's layout rather than forcing layout compromises

For buyers with smaller floor plans, replacing a similarly-sized older furnace, or doing a new build where space matters, the compact design + duct flexibility combination is the meaningful selling point.

18,000 BTU Heating for Small to Mid-Size RVs

The DFSD 20111 delivers proportional heating for smaller RV applications:

• BTU Input: 18,000 BTU/h
• BTU Output: 13,680 BTU/h (after combustion losses)
• Sized for smaller RVs, travel trailers, and compact motorhomes
• Avoids oversizing — better efficiency and shorter cycling on smaller loads

For RVs in the 20-30 ft range, this BTU range is generally well-matched to the actual heating load — large furnaces in small RVs short-cycle and run inefficiently. The DFSD 20111 is sized appropriately.

LP Propane Fuel

The DFSD 20111 runs on LP (propane) — the standard fuel for RV furnaces, available at any campground or filling station.

Electrical Specifications

• Voltage: 12V DC
• Amp Draw: 4.8 amps
• Power: 56 watts
• Compatible with standard RV 12V electrical systems

The 4.8 amp draw is meaningfully lower than larger furnaces — useful for buyers using batteries off-grid where every amp matters.

⚠️ What's NOT Included — Plan Accordingly

The DFSD 20111 ships with the core furnace and basic accessories, but does NOT include:

• Exterior door (sold separately — see compatible options below)
• Thermostat (sold separately, or reuse your existing if compatible)

Compatible Exterior Doors (Sold Separately)

The DFSD 20111 is compatible with these Dometic exterior doors (sold separately):

• White Door: Dometic Part #33045
• Black Door: Dometic Part #33044 or #32985

Depending on your installation location, a door may not be strictly required — some buyers can get by without one if the furnace is mounted in a properly enclosed cabinet. However, most exterior installations need a door for weather protection and aesthetics.

Compatible Thermostats (Sold Separately or Reuse Existing)

The DFSD 20111 is compatible with these Dometic thermostats:

• White Thermostat: Dometic Part #38453
• Black Thermostat: Dometic Part #32300

Many buyers can reuse their existing thermostat from the previous furnace installation — most compatible Dometic thermostats will work. Verify your existing thermostat is compatible with this furnace before assuming a clean reuse.

Ducting Configuration

The DFSD 20111 ships with 2 duct collars included as shown in product photos:

• Additional duct collars available for purchase if your installation requires more ducts
• Maximum 3 ducts recommended for a furnace of this BTU rating
• Sizing matters: Too many ducts will diminish airflow per outlet and reduce per-zone heating effectiveness

For most small to mid-size RV installations, 2-3 ducts is the right configuration for distributing heat through the floor plan.

⚠️ Packaging Note — No Original Manufacturer Box

These furnaces are new units but they do NOT come in the original Dometic manufacturer box. They are carefully double-boxed for shipping to prevent transit damage. This packaging approach has proven more effective at preventing damage during freight transit than the original manufacturer packaging.

What's Included

• (1) Dometic DFSD 20111 furnace
• Vent
• (2) Duct collars
• Installation manual

NOT Included (sold separately):

• Exterior door (white #33045 or black #33044 / #32985)
• Thermostat (white #38453 or black #32300; existing may be reusable)
• Additional duct collars beyond the 2 included

1-Year Parts Warranty

The DFSD 20111 is backed by our standard 1-year parts warranty.

⚠️ Professional Installation Required

RV furnace installation involves working with the RV's propane gas system, 12V DC electrical, duct integration, and structural mounting. Improperly installed propane appliances are a fire and explosion risk. Installation should be performed by a qualified RV service technician with experience working on Dometic furnaces. Always perform proper leak testing on gas connections after installation.

Genuine Dometic OEM

As a Dometic factory unit, the DFSD 20111 is built to current OEM specifications for RV furnace installations.

Key Features

• Genuine Dometic DFSD 20111 small furnace
• 18,000 BTU input / 13,680 BTU output
• Compact design — 12" W × 7" H × 20" D
• Most duct configurations available in this size class
• LP propane fuel
• 12V DC, 4.8 amp draw, 56 watts
• 2 duct collars included (more available for purchase, max 3 ducts recommended)
• Compatible exterior doors: White #33045, Black #33044 or #32985 (sold separately)
• Compatible thermostats: White #38453, Black #32300 (sold separately or reuse existing)
• New unit — double-boxed for shipping (no original manufacturer box)
• Backed by 1-year parts warranty

Specifications

• Brand: Dometic
• Model: DFSD 20111
• Item #: 38922
• Type: Compact RV Furnace
• Heating Input: 18,000 BTU/h
• Heating Output: 13,680 BTU/h
• Fuel: LP (Propane)
• Voltage: 12V DC
• Amp Draw: 4.8 A
• Power: 56 W
• Dimensions: 12" W × 7" H × 20" D
• Duct Collars: 2 included (max 3 ducts recommended)
• Compatible Exterior Doors: Dometic #33045 (white), #33044 or #32985 (black) — sold separately
• Compatible Thermostats: Dometic #38453 (white), #32300 (black) — sold separately
• Condition: New (not in original manufacturer box; double-boxed for shipping)
• Includes: Furnace, vent, 2 duct collars, installation manual
• Warranty: 1-year parts warranty