What is the expected temp of hot water at the kitchen sink?  Problem is shower temp, which is colder because its winter and longer hose feed, but in general at kitchen sink which is closest to the water heater I get hot hot water only if I've let it run for 10 to kick on the reheat.  But even then its only hot for a few mins then down to warm.  Thinking I need a new water heater, but worried will have same problem with new heater if this is expected, thoughts anyone?