Turn on full hot. Comes out at 120 degrees. Perfect temperature for a steaming hot bath. I love showering with STEAMING HOT water non-stop for an hour. Unit is very heavy duty, well built, medium difficulty to install, I did it by myself. I recommend at least 2 people to install as unit is nearly 100 pounds. I absolutely love this water heater and will certainly replace it in about 10-20 years with the same model if and when it needs it. Price comparison to replace existing 40 gallon tank water heater is 1100(Unit) + 300(Necessary parts and hardware to self install) dollars to self install Rheem tankless RTGH-95DVLP-2 versus 1400(Unit) + 200(Necessary parts and hardware to self install) dollars for 40 gallon tank water heater "Bradford-White Hydrojet."