Suburban NT-30SP
For a replacement where the old NT-series furnace sat in a deep cabinet and low amp draw matters.
Amazon $697.65$697.65
The Suburban NT-30SP rates 3.5 among 25,000 to 30,000 BTU RV furnaces; the Suburban SF-20FQ (2551A) rates 1.8 among under 25,000 BTU ones. The Suburban NT-30SP costs $253.53 less ($697.65 vs $951.18).
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.
Suburban SF-20FQ (2551A)
A like-for-like replacement for an older 20,000 BTU Suburban SF furnace in a small trailer.
Amazon $951.18$951.18
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 | Suburban NT-30SP | Suburban SF-20FQ (2551A) |
|---|---|---|
| Overall rating | 3.5/5 | 1.8/5 |
| Value 40% | 80 $23.25 per 1,000 BTU ($697.65, 30,000 BTU) | 24 $47.56 per 1,000 BTU ($951.18, 20,000 BTU) |
| Power draw 35% | 72 5.5 A running, 0.2 A per 1,000 BTU | 0 7 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
| Suburban NT-30SP | Suburban SF-20FQ (2551A) | |
|---|---|---|
| Heat and power | ||
| Input capacity | 30,000 BTU | 20,000 BTU |
| 12 V amp draw | 5.5 A | 7 A |
| Airflow | 345 CFM | 300 CFM |
| Discharge | Ducted | Ducted |
| Fit | ||
| Height | 12.5 in | 7.5 in |
| Weight | - | 29 lb |