Universal extra dimension (UED) models tend to favor a distinctively heavier Higgs mass than in the standard model and its supersymmetric extensions when the Kaluza-Klein (KK) scale is not much higher than the electroweak one, which we call the weak scale UED, in order to cancel the KK-top contributions to the T parameter. Such a heavy Higgs, whose production through the gluon fusion process is enhanced by the KK-top loops, is a fairly model independent prediction of the weak scale UED models regardless of the brane-localized mass structure at the ultraviolet cutoff scale. We study its cleanest possible signature, the Higgs decay into a Z boson pair and subsequently into four electrons and/or muons, in which all the four-momenta of the final states can be measured and both the Z boson masses can be checked. We have studied the Higgs mass, 500 GeV (and also 700 GeV with √s=14TeV), and have found that we can observe significant resonance with the integrated luminosity 10fb -1 for six-dimensional UED models. © 2012 American Physical Society.