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Old 01-20-2013, 12:53 PM   #1
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Question Heated holding tanks on 1976 Trade Wind?

I am in the process of buying a rebuilt, 1976 Trade Wind and need to know if the holding tanks are heated. I know that it has a fresh water tank, a gray water tank and a black water tank, in an enclosed area, but I do not know if a furnace duct is vented into the compartment. Does anyone know where to look and/or how to figure it out?
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Old 01-20-2013, 01:03 PM   #2
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Originally Posted by Patricia720 View Post
I am in the process of buying a rebuilt, 1976 Trade Wind and need to know if the holding tanks are heated. I know that it has a fresh water tank, a gray water tank and a black water tank, in an enclosed area, but I do not know if a furnace duct is vented into the compartment. Does anyone know where to look and/or how to figure it out?
Unless it was deleted by the owner, that trailer has a duct system that circulates warm air to the tanks, whenever the furnace runs.

There is a service manual available for your model year that will answer hundreds of questions for you.

And, they are very reasonable.

Andy
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Old 01-20-2013, 01:12 PM   #3
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On all '70's Airstreams that I have seen, including several I have owned, there are heated tanks. That is there is a little 2" duct that goes to the tank area from the main furnace ducts. Often two, one for the water tank, one for the holding tanks.

Look for a 2" duct(s) that goes through the floor.

That said, the heating system is primitive at best. It will probably keep any problems from happening down to 15 to 20 F, but not much lower. That of course assumes all your heat is coming from the furnace, not some electric space heaters. The furnace must run a fair amount to push any real amount of heat through those little ducts into a big uninsulated (or poorly insulated) space where the tanks are.

The holding tank outlet pipes and valves are almost never heated or insulated and enclosed in Airstreams, so the "heated tank" may not freeze, but the outlet valves commonly freeze. Not pretty if they freeze solid and break something.
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Old 01-20-2013, 01:32 PM   #4
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Thanks guys!

Wow. I've never had such quick and educated responses to a question. Once, I finally get my hands on my trailer (I'm in Arizona and my "new" Trade Wind is in Texas!) I'm sure I'll have more. This will be my first stop!
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Old 01-20-2013, 01:38 PM   #5
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When we replaced the furnace in our 1974 Ambassador last year, we found that the duct opening to blow air onto the tanks was smashed closed and stuffed full of insulation. So part of the furnace replacement project was to clean the ductwork as best we could and make sure the openings were indeed open and clear.

Fortunately, we hadn't done any below freezing camping until this past fall after we replaced the furnace so we didn't have any problems.

Nancy Mac
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Old 01-09-2014, 01:01 PM   #6
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That heat duct hose got damaged when repairing my Greywater tank.
rather than try replacing it I just left it out as trailer is not used for "Cold weather" camping and just drain tanks and add RV Antifreeze to shower and sink Drains.
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