12 yr old Dayton Electric Water Heater. First shower in morning is lukewarm at best. 15 minutes later water is piping hot and can take nice long shower hot as I can stand it. Any idea why it starts cool they gets hot? Seems exact opposite problem of everyone else.
Could be you have a faulty tap washer in the hot tap. Jams in place, after the first shower it had a chance to release a bit more and let extra hot water through.
Or are you saying that with the hot tap on only, you get a luke warm shower.
What type of hot water system do you have ?? gas instantaneous ??