KingRVer HF35-E 35,000 BTU
The cheapest 35,000 BTU furnace per BTU for a 28 to 38 ft trailer, on trust in a new brand.
Amazon $599.97$599.97
3.4/5
For a 40,000 BTU furnace in an RV with no exterior door and a long duct run.
- 40,000 BTUInput
- DuctedDischarge
Check price at Amazon$1,185.98
Price checked November 3, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Up to 24% more airflow than the older SF models, per the listing
- Doorless install
Cons
- Amp draw not found
- Priced at about $30 per 1,000 BTU
The Suburban SF-VHFQ family
Every Suburban SF-VHFQ model we rank, smallest first. Ratings compare each against its own size.
| Model | Input | Rating | Price |
|---|---|---|---|
| Suburban SF-30VHFQ (2576A) | 30,000 BTU | 3.1/5 | $1,146.49 |
| Suburban SF-35VHFQ (2587A) | 35,000 BTU | 3.2/5 | $1,230.63 |
| Suburban SF-42VHFQ (this one) | 40,000 BTU | 3.4/5 | $1,185.98 |
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.
Specifications
| Model number | SF-42VHFQ |
|---|---|
| Heat and power | |
| Input capacity | 40,000 BTU |
| Discharge | Ducted |
| Fit | |
| Height | 7.5 in |
| Weight | 28 lb |
| Warranty | |
| Warranty | 2 years |
Alternatives in this size
Suburban SF-42VHQ (2592A)
For big fifth wheels and motorhomes that need a single large furnace.
Amazon $1,138.76$1,138.76
Fogatti RF035A0N 35,000 BTU
A low-priced 35,000 BTU furnace with variable output for a cold-weather trailer.
Amazon $699.99$699.99
Compare
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