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Old 05-22-2018, 06:56 PM   #1
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2002 30' Classic S/O
Melbourne Beach , Florida
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Furnace Duct to Waste Tanks?

I have read many times about the furnace being ducted to the tank area to keep them from freezing. In the process of replacing my dump valves I have dropped the pan and been all over (actually under) the area of the pan covering the black and gray tanks and I see no evidence of a furnace duct. Is this only for the fresh water tank? Am I missing it somehow?


Thanks,


Al
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Old 05-22-2018, 07:19 PM   #2
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2004 19' International CCD
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Furnace Duct to Waste Tanks?

My understanding is that it depends on the model and year. Some use furnace ducted to tank areas, others have dedicated heating elements. Our 2004 19 CCD uses ducted heat from the furnace.
What year and model do you have?
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Old 05-22-2018, 08:06 PM   #3
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2002 Classic 30 Slideout. No heating elements I am aware of.



Al
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2002 Classic 30 Slideout
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2013 Dodge 2500 Laramie 4x4 Megacab Cummins
2001 Safari 25 RB Twin (Gone, but not forgotten)
WBCCI 1322, TAC FL-39, AIR 82265

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Old 05-22-2018, 09:47 PM   #4
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2004 19' International CCD
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Furnace Duct to Waste Tanks?

Quote:
Originally Posted by Al and Missy View Post
2002 Classic 30 Slideout. No heating elements I am aware of.



Al


Looking at the quick specs on the Airstream page for your model and year, I donít see it listed as standard or an option. Perhaps it wasnít available, or Iíve missed it ? https://www.airstream.com/service/document-archive/
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Old 05-23-2018, 06:31 AM   #5
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Our 91 has the furnace directly over the tanks and has an open duct straight to the tanks.
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Old 05-23-2018, 09:35 AM   #6
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2004 25' International CCD
2012 25' International
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Quote:
Originally Posted by Al and Missy View Post
I have read many times about the furnace being ducted to the tank area to keep them from freezing. In the process of replacing my dump valves I have dropped the pan and been all over (actually under) the area of the pan covering the black and gray tanks and I see no evidence of a furnace duct. Is this only for the fresh water tank? Am I missing it somehow?


Thanks,


Al
We had a 2004 International 25', and both gray and black tanks froze. Heat lamp and fan took about a day to help unfreeze.
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Old 05-23-2018, 11:05 AM   #7
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1985 31' Excella
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Not sure when / if they changed what ?
But all were advertised as heater basements , well there are no basements unless the new ones ?
My 85 has ducts laying on top of tanks going from front to back [ but no open part of duct to that area .
From the furnace under kitchen cabinets & other cabinets - the duct lays on the floor , at the point of the tanks the floor is cut-away [ also the winter drain is there ] and duct lays on tanks , then back on top of floor to get to bedroom , also below floor to other side of trailer - to bathroom and then above floor to duct .
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Old 05-23-2018, 12:23 PM   #8
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I believe, in your unit, you will find 2 ducts. One disappears through the floor right by the furnace. This one is for the fresh tank. The other one is under the closet floor and disappears under the floor right around the black tank vent stack. This one heats the black and gray tanks, as they are in the same pan. I have long been waiting for an excuse to drop the belly pan in order to better route and insulate the pan areas.
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Old 05-23-2018, 12:27 PM   #9
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2002 30' Classic
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My 2002 Classic (No SO) has ducts running into the under floor area. If you open the area to your water pump you will see a 2" branch flex pipe into the under floor area and in mine. if I take out the large drawer under the Microwave you can also see the 2" pipe.
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Old 05-23-2018, 12:30 PM   #10
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2004 22' Safari
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Quote:
Originally Posted by cstein View Post
My understanding is that it depends on the model and year. Some use furnace ducted to tank areas, others have dedicated heating elements. Our 2004 19 CCD uses ducted heat from the furnace.
What year and model do you have?
I have a 2004 22 foot Safari. It has 2 switches above the information panel for tank heaters. I haven't tested them, but the lights go on when I engage the switches.
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Old 05-23-2018, 03:04 PM   #11
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Thanks everyone. Well, I didn't drop the tanks so I can't attest to what might be above them, but all around them looking up I can see the subfloor. I'll take another look before I put the pan back on, particularly in the closet area and under the microwave cabinet. Both of those areas are about even with the front axle which is just behind the freshwater tank, however.


There's a lot about the slideout that makes me think they adapted non-slide parts, and not always completely or successfully. I found I had to drop the rear axle to remove the waste tanks pan as the axle was flange was bolted over (under) the side of the edge of the front flange of the tank pan. They may well have not run a duct to the waste pan area.


Al
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2002 Classic 30 Slideout
S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
2001 Safari 25 RB Twin (Gone, but not forgotten)
WBCCI 1322, TAC FL-39, AIR 82265

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