25,000 to 30,000 BTU is the common size for travel trailers and campers up to about 33 ft. Most of the cutouts in these RVs are the standard 7.5 x 17 x 20 in low-profile size, so the choice is mostly price, amp draw and whether the unit comes with a door.
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.
Full ranking 11
- Suburban NT-30SP#1 of 11Full review
For a replacement where the old NT-series furnace sat in a deep cabinet and low amp draw matters.
Amazon $697.65$697.6530,000 BTU5.5 A345 CFM - KingRVer HF30-E 30,000 BTU#2 of 11Full review
A budget 30,000 BTU complete furnace for a 24 to 33 ft trailer.
Amazon $649.99$649.9930,000 BTU-260 CFM - Fogatti RF030A0N 30,000 BTU#3 of 11Full review
A low-priced 30,000 BTU furnace for a budget replacement.
Amazon $679.99$679.9930,000 BTU-260 CFM - KingRVer HF25-E 25,000 BTU#4 of 11Full review
A budget 25,000 BTU complete furnace for a 20 to 28 ft trailer.
Amazon $599.99$599.9925,000 BTU-240 CFM - Suburban SF-30VHFQ (2576A)#5 of 11Full review
For a 30,000 BTU doorless swap in a trailer with no exterior furnace door.
Amazon $1,146.49$1,146.4930,000 BTU-- - Fogatti RF02580N 25,000 BTU#6 of 11Full review
The budget 25,000 BTU pick for a smaller trailer, if you accept an unproven brand.
Amazon $699.99$699.9925,000 BTU-240 CFM - Suburban SF-30Q (2559A)#7 of 11Full review
The lowest-priced new Suburban 30,000 BTU furnace on Amazon, when the original was a Q-series.
Amazon $932.57$932.5730,000 BTU7 A300 CFM - Dometic DFMD30111#8 of 11Full review
For a like-for-like replacement of the older Dometic medium furnace in a 30 ft trailer.
Amazon $1,299.99$1,299.9930,000 BTU7.5 A- - Suburban SF-30FQ (2558A)#9 of 11Full review
The straight swap for the many trailers that came with a 30,000 BTU Suburban SF furnace.
Amazon $965.84$965.8430,000 BTU7 A300 CFM - Dometic DFMD30121#10 of 11Full review
For a Dometic swap where the RV has no outside furnace door.
Amazon $1,272.29$1,272.2930,000 BTU-- - Dometic DFMD25111#11 of 11Full review
For an exact swap of an original Dometic 25,000 BTU furnace.
Amazon $1,187.40$1,187.4025,000 BTU7.5 A-
