Well, the Peet uses 15 watts of electricity, the 32" marine Goldenrod we use, also uses 15 watts of electricity. And with that, its impossible that a Peet in the same cubic foot space will produce more heat over a Goldenrod.The Peets keep it about 3-5° warmer than a Goldenrod. In a non heated building...damn. You're fighting a loosing battle!