A dishwasher requires 120 degrees (not code, there is no code it is manufactures recommendations) and temp at the faucet should not be over 120. So your answer is 120. Now with that being said as soon as you start using an electric water heater tank (not tankless) the temp will drop. You can also adjust the temp on the water which some people do when they are snowbirds. That would require you to remove the cover and check the setting and element.