  A search for a heavy Higgs boson in the $H\rightarrow ZZ\rightarrow
2\ell2\nu$ decay channel, where $\ell$ = e or $\mu$, in pp collisions at a
centre-of-mass energy of 7 and 8 TeV is presented. The search is optimized
separately for the vector boson fusion and the gluon fusion production
processes. No significant excess is observed above the background expectation.
A re-interpretation of the results as a search for an electroweak singlet
extension of the Standard Model is also presented.
