How hot do you like your tap water?

My hubs installed a tankless water heater. He did a beautiful job, too. But the hot water isn’t hot enough for me. If I fill the sink with only hot water for washing dishes, but I can reach into the sink for a plate, or whatever, it isn’t hot enough for me. It’s a good temp for washing, but I want to rinse those puppies in scaulding hot water!
So he needs to adjust the temperature.
How hot do you like your water?