There is more than one artist with this name

1)Heat, a Christian Rap ensemble.

2)Heat, also a Christian band (but not Rap).

3)HEAT is an indie rock band in the US, formed in 2007 with the band members of Izumi on vocals, L on lead guitar, Chaos on second guitar, Kaze on bass, and Rai on the drums. They are signed on the Black Flame Production record label. It was on 2007.7.4 that they released their first mini album, Born to Be Burn.