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Old 02-17-2008, 10:01 PM   #15
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1969 31' Sovereign
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David - Tank heaters are essential in genuinely cold weather. do a search there's a ton of info here, also you can check the winter living forums - very good info
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Old 02-18-2008, 08:42 AM   #16
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The reason for keeping a quanity of water in the tank is because the larger quanity of water has a higher thermal mass and thus takes longer to freeze. This is not a CURE-ALL as it will only prolong the freezing time not eliminate it. Good for an overnight situation were the temp is falling below freezing.

Leaving the gray water open during freezing temperatures is fine as any water will flow to the camp ground sewer before it can freeze. However the valve assembly will most likely freeze open do to the small amount of water that will remain in the valve groove.

If you install heat tape to the valve you will have to overwrap it with insulation to make sure the heat is applied to the valve and not just dissapated to the surrounding air. Also if you wrap the valve area tight and back to the tank the heat of the tape will flow towards the water in the tank. Heat in water will flow upwards.
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Old 02-18-2008, 08:50 AM   #17
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I'm a little late to this thread, but my question is:

Did you have the furnace running? All Airstreams have some sort of tank heat, be it forced air or on the 22s, electric. If it were well below zero, I'd consider running the furnace while in transit. I don't think that practice goes against the design or engineering of the furnace, but it may solve your freezing issues.
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