[Fulltiming]

The insta-hot should reach temperature immediately. We used the one in our Newell regularly and put one in the house. They do have to replaced occasionally if the element burns out or the tank starts leaking. Home Deport and Amazon sell new units. Yours may be the victim of mineralization/calcification build up on the heating coils or it may need to be turned to a higher setting on the temperature knob on the front of the heater unit.