Sorry, I should have been clearer. The "leak" is actually a shunt between
the hot and the cold pipes. In a single handle faucet when the handle is
off, if the cartridge is worn it is possible for hot water which has higher
water pressure to flow through the faucet and then out the cold water pipe
if you use municipal water. There is no external leak for you to see. turn
off one faucet at the undersink shutoff valves (hot and cold) tonight. Does
that fix the problem for the morning's shower? Do the same for all the
faucets and hopefully you'll find a culpit.
normally its installed at the factory HOWEVER a buddy of mine had a
one likely cause of this problem
you should NEVER sweat a pipe installed in a tank! or the dip tube
will melt and fall to the bottom. OP may have soldered pipe on tank,
stressed it bad, a few days later it broke off..........
It is common procedure to sweat a male adaptor to copper pipe. About six
inch long piece. Let the pipe section and male adaptor cool. Thread the
newly created pipe with threads into the WH fitting. Use both teflon tape,
and Rectorseal, to seal the threads.
Make the last sweat fitting at the end of the six inch pipe, which is away
from the WH. Use a roll stop coupler if you don't figure to be doing this
very often. Copper union if you think you might need another WH and want the
convenience of easy disassembly.
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