Assuming the heater is actually working... Make sure your bypass/ winterizing valve is closed at the water heater. Also make sure your valves are closed if you have an outside shower. Many a person left them on and it allows to cold water into the hot lines.
Is the heater working on propane or electric if not above?
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Pat, Jen & Heather... Oh yeah and our trained attack trailer cat, Cinnamon
2015 ChevyHD D-Max
2014 Greywolf 26DBH