So for 3 days now, and after replacing both Elements and Thermostats, I will have hot water through the late day and evening but Luke warm water in the mornings. I believe I have determined part of the problem is that my Heat Pump HVAC uses a humidifier attached to Hot water line and it's been extremely cold lately and the HVAC runs hard in the mornings to bring house back from night setting. The EWH is 11 yers old State 80 gal unit 4500kw. All components have been tested and seem to function correctly. Seems that the EWH is not keeping up with hot water usage with only the humidifier pulling from it. What am I missing beside maybe a bad dip tube, or is it just time for a new unit? The water line in/out are soldered fittings so before cutting the cold line I thought I'd ask a pro. Thx