  We consider a Standard Model extension by a heavy charged scalar gauged only
under the $U_{Y}(1)$ weak hypercharge gauge group. Such an extension, being
gauge invariant with respect to the SM gauge group, is a simple special case of
the well known Zee model. Since the interactions of the charged scalar with the
Standard Model fermions turn out to be significantly suppressed compared to the
Standard Model interactions, the charged scalar provides an example of a
long-lived charged particle being interesting to search for at the LHC. We
present the pair and single production cross sections of the charged scalar at
different colliders and the possible decay widths for various boson masses. It
is shown that the current ATLAS and CMS searches at 8 and 13 TeV collision
energy lead to the bounds on the scalar boson mass of about 300--320 GeV. The
limits are expected to be much larger for higher collision energies and,
assuming $15~ab^{-1}$ integrated luminosity, reach about 2.7 TeV at future 27
TeV LHC thus covering the most interesting mass region.
