i just replaced hot water heater with the exact same one i had. the old one was leaking. my son tells me his shower hasnt been hot for a few weeks now. i figured it could be mixing valve in shower. i havent had a chance to replace yet but could that be the reason im not getting hot water in kitchen sick or other bathroom? i can turn on hot water in kitchen and will not get hot. i can go in my bathroom and turn on water and then sink in kitchen will get hot. i have both thermostats on 135 and i can assure you, i have checked 10 times that i didnt cross the lines while hooking up.