The SUNFIRE SF120 scales up to 120,000 BTU output and 2,800 square feet of coverage — sized for larger shops, multi-bay garages, mid-size pole barns, and commercial job sites where the SF80’s 1,900 sq ft coverage isn’t sufficient. The 14-gallon tank delivers approximately 16 hours of continuous run time at 0.85 GPH for diesel or 0.78 GPH for kerosene — long enough to cover a full overnight cycle or a multi-shift commercial workday without refueling.
The radiant design is the operational differentiator over torpedo-style forced-air heaters: it’s quiet enough to hold a conversation near, not subject to wind interference, and the 99% pure fuel burn means heat without the strong fuel odors that fill a shop running a torpedo heater. Built-in tip-over switch automatically shuts off the heater if knocked over.
Title explicitly states “USA Made” — SUNFIRE manufactures Odorless Radiant heaters in Janesville, Wisconsin. For mid-size commercial heating needs where the SF80 is too small but the SF160 is overkill, the SF120 is the right SUNFIRE capacity tier. Significant build quality investment but pays back across years of low-maintenance shop heating.
