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Heated Enclosed Holding Tanks?


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#1 WoodGlue

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Posted 02 February 2013 - 11:26 AM

I have a 4 Seasons package on my 2013 Travel Trailer and was wondering how the holding tanks are heated? Are they just naturally pulling off the 12v system? BTW, I have a 140watt solar panel.

Thanks,

WoodGlue

When Hell Freezes Over - I'll Camp There Too!

2002 Land Rover Discovery II - Kalahari Edition

2014 Lance 1685 Travel Trailer - Loaded With Every Option

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#2 Newt

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Posted 02 February 2013 - 11:42 AM

Most are heated by heat bleed from the furnace ducting running through the basement area. You have to run the furnace in cold temps to keep the holding tanks from freezing.

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#3 WoodGlue

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Posted 02 February 2013 - 12:48 PM

So, if I'm at a FHU site, I'll still be forced into using propane for the tank heating? No electrical bypass?

WoodGlue

When Hell Freezes Over - I'll Camp There Too!

2002 Land Rover Discovery II - Kalahari Edition

2014 Lance 1685 Travel Trailer - Loaded With Every Option

2014 Garmin RV760LMT - New RV Specific GPS Unit

Los Angeles / Montana

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#4 Ronbo

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Posted 02 February 2013 - 12:52 PM

That is correct. Some rv's do have an electric heating pad under the tanks. You will have a switch for those. If you dont want to use propane an option is to place a light bulb in you compartment with the tanks. Then you can use electricity.
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#5 Barbaraok

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Posted 02 February 2013 - 01:25 PM

1359826014[/url]' post='599040']
I have a 4 Seasons package on my 2013 Travel Trailer and was wondering how the holding tanks are heated? Are they just naturally pulling off the 12v system? BTW, I have a 140watt solar panel.

Thanks,

WoodGlue


What does your owners manual say? Since you don't have a basement, do you have a switch that says tank heater or something similar? Why didn't your dealer go through that with you on the PDI?
Barb

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#6 WoodGlue

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Posted 02 February 2013 - 01:32 PM

What does your owners manual say? Since you don't have a basement, do you have a switch that says tank heater or something similar? Why didn't your dealer go through that with you on the PDI?
Barb


My trailer is about 15 miles away right now and my owners manuals are inside. I think I did ask during the PDI, but we got into a discussion about the tank valves - iirc.

When Hell Freezes Over - I'll Camp There Too!

2002 Land Rover Discovery II - Kalahari Edition

2014 Lance 1685 Travel Trailer - Loaded With Every Option

2014 Garmin RV760LMT - New RV Specific GPS Unit

Los Angeles / Montana

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#7 Barbaraok

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Posted 02 February 2013 - 01:42 PM

That's why I advise people to video tape their PDI. Posted Image
Barb

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#8 Kirk

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Posted 02 February 2013 - 03:52 PM

If they are heated, either of the two ways mentioned are pretty common. If you have enclosed bays under the RV for storage then it probably is from the furnace, but if it is you can easily look at the back of your furnace and observe the ducts and trace them to see where they go. If the furnace supplies heat to the bays there is usually a much smaller duct that goes there, as compared to those that supply heat to the interior of the RV.

If you have heat pads on the tanks themselves, which is the other common way to keep tanks from freezing in a trailer. They are normally powered by 12V-dc, but I've been told that there are some which use 120V-ac(?) In such a case you will have heating pads that are attached to the bottom of each tank and somewhere there should be an on/off switch for them. On a travel trailer, I would bet that heat pads is what prevents the tanks from freezing. The Lance website doesn't say what heat source they use, but I'd suspect it to be the 12V heat pads, were I to guess. If you call your dealer they should be able to tell you which it is.

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#9 WoodGlue

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Posted 02 February 2013 - 07:20 PM

Good idea Barb! You know, I guess I could tape a PDI for my trailer and put it online later for people who aren't too sure of their systems. That is, as soon as I have more experience under my own belt, which will be some time LOL :rolleyes:

Thanks Kirk, I will contact the dealer and ask him again to clarify!

WoodGlue

When Hell Freezes Over - I'll Camp There Too!

2002 Land Rover Discovery II - Kalahari Edition

2014 Lance 1685 Travel Trailer - Loaded With Every Option

2014 Garmin RV760LMT - New RV Specific GPS Unit

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#10 Jim n Sue

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Posted 02 February 2013 - 07:39 PM

My tanks are 12 volt heated... Look for another switch which says tank heaters,probably close to your water pump switch The amperage used on these is in milliamps. so don't worry about them sucking batteries deadPosted Image
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#11 RWinslow

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Posted 02 February 2013 - 11:15 PM

We have both 12VDC and 120VAC Heating Pads under our holding tanks. Once the temp drops below -10 or so the tank outlet piping will typically freeze at the valve. This is resolved by running heat trace / heat tape up to the valve / tank outlet and adding another layer of foam insulation. This way the tanks can even be dumped at -30F with a 20 mph wind!
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#12 WoodGlue

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Posted 02 February 2013 - 11:49 PM

We have both 12VDC and 120VAC Heating Pads under our holding tanks. Once the temp drops below -10 or so the tank outlet piping will typically freeze at the valve. This is resolved by running heat trace / heat tape up to the valve / tank outlet and adding another layer of foam insulation. This way the tanks can even be dumped at -30F with a 20 mph wind!


I do know my tank valve won't freeze up beyond the gate valve, if that is the correct terminology. I have an email in to the dealership asking about the original question. I'll post the answer as soon as I know. That way other Lance owners will have an answer at least!

WoodGlue

When Hell Freezes Over - I'll Camp There Too!

2002 Land Rover Discovery II - Kalahari Edition

2014 Lance 1685 Travel Trailer - Loaded With Every Option

2014 Garmin RV760LMT - New RV Specific GPS Unit

Los Angeles / Montana

Plain Wrap Lance.jpg