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From a fulltimer. Don't let the water run! If it's freezing outside, the sewer hose will begin to freeze, water will begin to back up, freezing as it goes. Then you'll be running water into your grey water tank. Not worth the chance. Just disconnect the sewer hose at the rig, hold it up and walk the liquid down toward the sewer inlet in the park.
As for pipe heating hoses, I have one on my 25 ft water hose that is connected to a thermostat. When the weather drops below 34° it kicks in. Have never melted a hose! I used a styrofoam cooler box over the water connection of the campground with a light bulb inside to keep the park water connection from freezing. Never have had a problem with this setup. As a matter of fact, I have a dual filter setup also inside the cooler box and it has never frozen down to -7°.
Your grey and black water tanks shouldn't freeze as long as you run your furnace at night with a thermostat setting of about 60°. Ours don't.
Orv
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