Recently I've found that in the morning my second floor bathroom sink will produce warm, almost hot water from the cold tap for about 15 sec. in the morning.
I'm thinking - "this is GREAT, the city is piping us out hot water! - this will sure help with my New England winter heating bills!". then I woke up... ;)
It's an old sink with separate taps, no mixing valve. Is this an indication of another mixing valve failing? My shower has a temp regulating mixing valve which seems to be function properly - is that the likely culprit? Would hot water run back into teh cold line and come out the cold side 5 feet away? - WHy? the pressure is the same in the hot and cold lines, isn't it? I've never heard of this symptom - any one else??
Many TIA
Martin