This Letter shows that the nonlinear equation arising in heat transfer recently investigated in papers [D.D. Ganji, Phys. Lett. A 355 (2006) 337; S. Abbasbandy, Phys. Lett. A 360 (2006) 109; Flafez Tari, D.D. Ganji, H. Babazadeh. Phys. Lett. A 363 (2007) 213] and [M.S.H. Chowdhury, I. Hashim. Phys. Lett. A 372 (2008) 1240] is exactly solvable, analyses the equation fully and, furthermore, gives analytic exact Solution in implicit form for each value of parameters of equation. (C) 2009 Elsevier B.V. All rights reserved.