$1,187.37
The Dometic DFMD25111 rates 2.1 among 25,000 to 30,000 BTU RV furnaces; the Dometic DFSD20121 rates 2.0 among under 25,000 BTU ones. The Dometic DFSD20121 costs $94.88 less ($1,092.49 vs $1,187.37).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Dometic DFSD20121
For a van, truck camper or small trailer that needs a low-draw doorless furnace.
Amazon $1,092.49$1,092.49
Scores side by side
These two sit in different size classes (25,000 to 30,000 BTU and under 25,000 BTU), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Dometic DFMD25111 | Dometic DFSD20121 |
|---|---|---|
| Overall rating | 2.1/5 | 2.0/5 |
| Value 40% | 24 $47.49 per 1,000 BTU ($1,187.37, 25,000 BTU) | 5 $60.69 per 1,000 BTU ($1,092.49, 18,000 BTU) |
| Power draw 35% | 22 7.5 A running, 0.3 A per 1,000 BTU | 36 4.8 A running, 0.3 A per 1,000 BTU |
| Warranty 25% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Dometic DFMD25111 | Dometic DFSD20121 | |
|---|---|---|
| Heat and power | ||
| Input capacity | 25,000 BTU | 18,000 BTU |
| 12 V amp draw | 7.5 A | 4.8 A |
| Discharge | Ducted | Ducted |
| Fit | ||
| Height | 7.4 in | 7 in |
| Weight | 33.5 lb | 20.8 lb |