Suburban SF-42VHQ (2592A)
For big fifth wheels and motorhomes that need a single large furnace.
Amazon $1,138.76$1,138.76
The Suburban SF-42VHQ (2592A) is the better RV furnace overall, rated 3.5 to 3.0. The Suburban SF-42VHQ (2592A) costs $16.78 less ($1,138.76 vs $1,155.54).
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.
Dometic DFLD40121
For a large motorhome or fifth wheel with a doorless Dometic furnace to replace.
Amazon $1,155.54$1,155.54
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 35,000 BTU and up RV furnace; a clear win is highlighted. How we rank explains each one.
| Factor weight | Suburban SF-42VHQ (2592A) | Dometic DFLD40121 |
|---|---|---|
| Overall rating | 3.5/5 | 3.0/5 |
| Value 40% | 64 $28.47 per 1,000 BTU ($1,138.76, 40,000 BTU) | 63 $28.89 per 1,000 BTU ($1,155.54, 40,000 BTU) |
| Power draw 35% | 54 9 A running, 0.2 A per 1,000 BTU | 50 12 V amp draw not published (neutral score used) |
| Warranty 25% | 50 2-year warranty | 0 warranty not published, scored as none |
Specifications
| Suburban SF-42VHQ (2592A) | Dometic DFLD40121 | |
|---|---|---|
| Heat and power | ||
| Input capacity | 40,000 BTU | 40,000 BTU |
| 12 V amp draw | 9 A | - |
| Discharge | Ducted | Ducted |
| Fit | ||
| Height | 7.5 in | - |
| Weight | 35.6 lb | 35.5 lb |
| Warranty | ||
| Warranty | 2 years | - |