Dometic DFLD40121
For a large motorhome or fifth wheel with a doorless Dometic furnace to replace.
Amazon $1,155.54$1,155.54
The Dometic DFLD40121 rates 3.0 among 35,000 BTU and up RV furnaces; the Dometic DFMD30121 rates 2.6 among 25,000 to 30,000 BTU ones. The Dometic DFLD40121 costs $116.75 less ($1,155.54 vs $1,272.29).
Prices were last checked November 4, 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.
$1,272.29
Scores side by side
These two sit in different size classes (35,000 BTU and up and 25,000 to 30,000 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 DFLD40121 | Dometic DFMD30121 |
|---|---|---|
| Overall rating | 3.0/5 | 2.6/5 |
| Value 40% | 63 $28.89 per 1,000 BTU ($1,155.54, 40,000 BTU) | 33 $42.41 per 1,000 BTU ($1,272.29, 30,000 BTU) |
| Power draw 35% | 50 12 V amp draw not published (neutral score used) | 50 12 V amp draw not published (neutral score used) |
| Warranty 25% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Dometic DFLD40121 | Dometic DFMD30121 | |
|---|---|---|
| Heat and power | ||
| Input capacity | 40,000 BTU | 30,000 BTU |
| Discharge | Ducted | Ducted |
| Fit | ||
| Weight | 35.5 lb | - |