A one-dimensional radial model for tandem mirror transport is developed for the study of the effect of temperature gradients. Induced azimuthal electric fields are neglected for simplicity. In the limit of large collisional energy exchange between electrons and ions – often appropriate to present-day tandem mirror experiments – the confinement time scaling law τ⊥ ∼ (ΔΦ)−3/2 is obtained for TMX-U.