Most warheads have hollow plutonium pits that are filled with tritium (right before implosion) triggering a fusion reaction from the high heat of the plutonium

Most warheads have hollow plutonium pits that are filled with tritium (right before implosion) triggering a fusion reaction from the high heat of the plutonium fission reaction. So no, it's not only the H-Bombs, though those are primarily fusion while tritium is only used to "boost" classic implosion fission warheads.