"Terry Coombs" wrote in message
news
At 3 AM and 3° , the water was fine . At 6:30 and 1° it was frozen (only
in the camper , The Shed water is fine) . Apparently the insulation I
covered the short vertical run of hose wasn't quite enough and I shoulda
left a faucet dripping . Well , now I know how cold it needs to get before
I need to drip the faucet .

Having the faucet "drip" may not do anything but make an icicle before the
line freezes. You need to run a stream of water, the colder the temperature
the faster the stream.