  We study the scalar triplet extension of the standard model with a low
cutoff, preventing large corrections to the quadratic masses that would
otherwise worsen the hierarchy problem. We explore the reach of LISA to test
the parameter space region of the scalar potential (not yet excluded by Higgs
to diphoton measurements) in which the electroweak phase transition is strongly
first-order and produces sizeable gravitational waves. We also demonstrate that
the collider phenomenology of the model is drastically different from its
renormalizable counterpart. We study the reach of the LHC in ongoing searches
and project bounds for the HL-LHC. Likewise, we develop a dedicated analysis to
test the key but still unexplored signature of pair-production of charged
scalars decaying to third-generation quarks: $pp\rightarrow t\overline{b}
(\overline{t}b), b\overline{b}$. These results apply straightforwardly to other
extensions of the Higgs sector such as the 2HDM/MSSM.
