Under 25,000 BTU is the size for camper vans, truck campers, pop-ups and small trailers, or a second zone in a larger rig. These furnaces are the easiest on a battery, and some blow straight from a grille on the case instead of through ducts.
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 3
- Suburban NT-20SEQ (2504ABK)#1 of 3Full review
For a camper van or small trailer with one open room, where battery drain matters more than total heat.
Amazon $839.91$839.9119,000 BTU2.8 A150 CFM - Fogatti RFS20A0B 20,000 BTU#2 of 3Full review
For a van, truck camper or small trailer where low battery draw outweighs raw heat.
Amazon $899.99$899.9920,000 BTU2.9 A- - Suburban SF-20FQ (2551A)#3 of 3Full review
A like-for-like replacement for an older 20,000 BTU Suburban SF furnace in a small trailer.
Amazon $951.18$951.1820,000 BTU7 A300 CFM
