Nail co-wrote four of the album's eleven tracks. The album's final track is a cover of Glen Campbell's "Galveston," which Nail performs as a duet with Lee Ann Womack, "When They're Gone (Lyle County)" features harmony vocals from Little Big Town and "Brand New Day" features harmony vocals from Aubrie Sellers, Womack's daughter.
"Whatever She's Got" was released as the album's lead-off single on May 28, 2013. It became Nail's second number one single on the BillboardCountry Airplay chart in February 2014, as well as his first Top 40 hit on the BillboardHot 100. In addition, it has received a Platinum certification in the U.S. "Kiss You Tonight" was released as the second single from the album on March 3, 2014.
I'm a Fire has received mostly positive reviews from music critics. At AllMusic, Stephen Thomas Erlewine rated the album three out of five stars, saying that "I'm a Fire [is] insinuating, not insistent. It may not deliver a knockout punch but it's not intended to be powerful; it's a grower, sounding better with repeated exposure, repeated listens revealing the craft in the songs and the subtlety in Nail's execution." Jon Freeman of Country Weekly graded the album an A-, writing that "Golden-voiced David Nail is one of those rare singers who sounds comfortable singing just about anything, so it’s to his credit that he deals in more hefty material on his third album, I’m a Fire." At Roughstock, Matt Bjorke rated the album four-and-a-half stars out of five, favorably describing the "more ‘upbeat’ and less ‘downtempo’" nature of the record. He praised album track "The Secret" as one of Nail's best songs. Taste of Country highlighted the album as a Critic's Pick and Billy Dukes complimented the lyricism, production, and Nail's ability to do heavy heartache. He listed "Burnin' Bed," "Brand New Day," and "The Secret" as the standout tracks.
The album debuted at No. 3 on the Top Country Albums chart and No. 13 on the Billboard 200, with 23,000 copies sold in the United States, making it Nail's highest-charting album on both charts. As of August 2014, the album has sold 64,000 copies in the US.