We present a thermodynamic analysis of the pyromagnetic effect for the case of a ferromagnet with uniaxial anisotropy using the molecular field approximation (MFA). We have divided the response function into a product of terms which we believe gives the best insight into the requirements of a material for a good pyromagnetic detector. In particular, we find that one should use a material with the largest magnetic heat capacity possible. Also, for small fields, we may realize the best detector withHalong the hard axis and the pickup along the easy axis. Our analysis suggests that certain of the critical point exponents, as well as the anisotropy power law behavior, may be more easily measured using the pyromagnetic technique.