  We consider the electroweak theory with an additional Higgs triplet at one
loop using the hybrid renormalization scheme based on $\alpha_{\rm EM}$, $G_F$
and $M_Z$ as input observables. We show that in this scheme loop corrections
can be naturally split into the Standard Model part and corrections due to
``new physics''. The latter, however do not decouple in the limit of infinite
triplet mass parameter, if the triplet trilinear coupling to SM Higgs doublets
grows along with the the triplet mass. In electroweak observables computed at
one loop this effect can be attributed to radiative generation in this limit of
a nonvanishing vacuum expectation value of the triplet. We also point out that
whenever tree level expressions for the electroweak observables depend on
vacuum expectation values of scalar fields other than the Standard Model Higgs
doublet, tadpole contribution to the ``oblique'' parameter $T$ should in
principle be included. In the Appendix the origin of nondecoupling is discussed
on the basis of symmetry principles in a simple scalar field theory.
