I just recently purchased a home with my soon to be wife and we're having some issues with getting hot water in the shower. We have a summer winter hookup that supplies our hot water. The kitchen and bathroom sinks get plenty hot, but the shower (right next to the kitchen) the water only gets luke warm for a brief period (generally after a few minutes) then goes to cold. however if you check the either sink at the time the shower goes cold, they are still plenty hot. talked to a plumber at the local hardware store and he said to check if there was a "hot water limiter" is what i'll call it on the pipes (not sure of the technical name) to see if there was one that may have went bad or not set correctly. opened the access panel and didn't see any of thing that looked like a temp control knob/fitting etc. we're at a loss and having cold showers for 3 weeks is getting old fast!
some other background....plumbing in the house is old galvanized steel that is starting to rust through (fixing that as soon as a friend that used to be a plumber can get over). also there is a thermistat on the furnace for the hot water system that has an upper limit, a lower limit and a differential setting....lower limit was at 120, upper limit at 170, with a 10 differential allowed. i know the 170 is too hot, but no sure where all these settings should be.....
any help would be apreciated!