How should separate double pole GFCI circuit breaker be connected in each of the following circuits:

Water pump circuit - 2 hot wires?
Clother dryer circuit - 2 hot wires or 2 hot wires & a grounded neutral?
Water heater circuit - 2 hot wires?

GFCI breakers have a Line and Load neutral. The load neutral will not be used with a 2 wire system.

The GFCI is designed to CATCH a "grounded neutral" and will trip.