Freezing temps tonight. I am dewinterizing. What to do?

[Mgmlark]

I’m In the middle of de-winterizing + Sanitizing . Freshwater Tank and all of the lines are full of chlorinated H2O. We expect temps to drop to 26 degrees tonight. Should I leave the water in the tank and lines or flush everything out? The trailer is not in an enclosed protected space.

[cpaharley2008]

Turn the heater on for one night....

[Mgmlark]

Great. I was also thinking that might work�� thank you

[alanmalk]

4 things to consider:
If the daytime temperatures were above freezing, the full water tanks should retain enough heat at night to stay liquid.

The exposed PEX lines are flexible enough to withstand freezing.

The interior plumbing, including pumps, valves and P-traps will be fine if the heater is running.

That leaves the grey and black drains. Best to put a gallon of RV antifreeze into each tank to protect the drain valves.