said by garys_2k:
Once the generator is also connected (better actually bonded) to the house's electrical system it's no more dangerous than the utility power would be.
Agreed, Frink should run out to buy some lenght of 6AWG braided bare copper and a split bolt, or a ground clamp, to link the generator's chassis bolt to wherever the house panel gets grounded (Copper pipe propably).
said by robbin:
That is assuming the OP is ONLY powering the water heater and not another appliance at the same time.
Assuming that he is running other appliances.... then what?