Losing hot water in middle of shower
I have a hot water heating (installed in 1991) with a tankless hot water system. We had leaking from the boiler and a plumber put in a new autofeed/fast fill/pressure valve done in November of 2008. It corrected the leaking problem from the pressure relief valve pipe. (about a quart a day). He made sure all air pockets were removed. In the past several weeks, we notice that we have been losing hot water in the middle of the shower. It does not get freezing cold, and you can finish showering. It takes anywhere from 6 minutes to warm up again (sometimes I wait so long that I just finish up and get out). Recently, we have noticed sloshing sounds coming from the pipes in the morning when the heater kicks in and it sounds like you are at the sea. Any suggestions on how to fix the problem would be appreciated.
Wayne