Dometic DFSD20121

Last updated: November 9, 2026

Dometic DFSD20121

2.0/5#3 of 4 in under 25,000 BTU RV furnaces
2.0

For a van, truck camper or small trailer that needs a low-draw doorless furnace.

18,000 BTUInput
4.8 A12 V draw
DuctedDischarge

Check price at Amazon$1,092.49

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

Draws under 5 A on 12 V, easy on a small battery bank
Only 12 in wide and about 21 lb, fits vans and small campers

Cons

About $61 per 1,000 BTU
Doorless, so it suits rigs without an outside furnace door

How it scores

The rating comes from 3 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Value $60.69 per 1,000 BTU ($1,092.49, 18,000 BTU)5
Power draw 4.8 A running, 0.3 A per 1,000 BTU36
Warranty warranty not published, scored as none0

Specifications

Heat and power
Model number	9108923341
Input capacity	18,000 BTU
12 V amp draw	4.8 A
Discharge	Ducted
Fit
Height	7 in
Weight	20.8 lb

Alternatives in this size

Suburban NT-20SEQ (2504ABK)

#1 in Under 25,000 BTU3.4Full review

For a camper van or small trailer with one open room, where battery drain matters more than total heat.

$837.44

19,000 BTU2.8 A150 CFM

Fogatti RFS20A0B 20,000 BTU

#2 in Under 25,000 BTU3.0Full review

For a van, truck camper or small trailer where low battery draw outweighs raw heat.

$899.99

20,000 BTU2.9 A

Suburban SF-20FQ (2551A)

#4 in Under 25,000 BTU1.8Full review

A like-for-like replacement for an older 20,000 BTU Suburban SF furnace in a small trailer.

$951.18

20,000 BTU7 A300 CFM

Compare

Compare the Dometic DFSD20121 with any other RV furnace →

More from Dometic: every Dometic product ranked.