Lowest price:$129.99Description: This power-packed heater boasts up to 18,000 BTU/hr. with the capacity to heat up to 400 square feet of space for up to 220 hours (on low position). It also features a built-in thermal protection probe; low-oxygen shutoff pilot safety system; and a porcelain-coated reflector. CSA Certified for indoor and outdoor use. Uses an AC adapter (not included) or 4 D-cell batteries (not included) to power the blower fan.