in freezing temps it's a good idea to disconnect your water overnight and reconnect in the am.
If the day temps are above 32 you shouldn't have an issue....
I put a "heavy duty" (resistant to breaking, etc available at any hardware store worth their salt) light bulb in a trouble light housing and stick it in the water bay, it keeps it above freezing... it's worked for me down to 18 degrees at night and above freezing during the day.
keep your heat on inside the rv
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