The only outside drain in basement is 25ft run of 3" PCV pipe under concrete flooring in furnace/waterheater room that dumps into sump pump. Such was done (I assume) by home builder to deal with condensation that would flow forth from 5 Ton AC through 1\2" PCV that "sits" in the drain. When AC runs condensation flows out of pipe into sump pump which pumps water outside of dwellng.
When I had 50 gallon water-heater replace, I also had plumber sit heater in an aluminum drain-pan to safeguard against flooding if it should become problematic in the future, i.e., burst, leak, etc. If I connect pan outlet to the above noted drain, will the hot water flowing from the heater through such damage the sump pump or kill grass outside where it dumps out.