Water Tank Heating

does any one know, if the vents that are supposed to keep the under side and tanks warm are positioned over the water Tanks.
I have fresh water Tank right up the back of my Cat about 15 inches from the back. the galley and grey are right on top of the axles. and the black is under the storage bay at the front.
Sean

I'm not sure but when I exposed my fresh water tank, I couldn't see the vent anyplace so it must have been over the tank.

In my 29RLBS the heat duct runs down the center of the trailer. At the rear of the trailer it stops about 36" from the back wall. At the front it terminated in a verticle plenum that feeds the bedroom through the floor and the basement through a 3/4" hole array that is punched in one wall of the verticle duct.

In the 29RLBS the fresh water tank is at the very rear of the trailer, the galley grey water is over the axles, the black water tank is under the rear of the basement area and the shower/bathroom sink greywater is at the center of the basement area. Because the freshwater tank was essentially behind the warm air duct, I wouldn't depend on that to keep it from feezing.

In 4*F weather in the mountains of NC we never had one of the tanks freeze on us. We have never used the freshwater tank because we don't boondock, so there never was any risk of that freezing. We ran a combo of the trailer furnace and two oil filled electric radiators and the furnace would cycle about every half-hour. That seemed to be enough heat to keep the tanks from freezing.

Not so the valves. If we didn't dump the tanks on a frosty night, the valves could freeze and we'd have to wait until the day warmed to get them working again.

Also, we never had an internal water line freeze up on us.

If I remember right Sean, the set-up is supposed to keep the Cat from freezing down to 25 F/-4 C.

Packing insulation around the tanks would definitely be a plus for very cold conditions. Also, a system such as this: http://www.ultraheat.com/ could come in mighty handy.

TC

Thanks schrowang for that info as you can't see the heat inlet when the tanks are in situ.
TC. if the temp goes down to -4C I should be OK. As our coldest month tends to be February, and I am only planning 1 week away for that month

On my unit, there is no heating of the fresh water tank or holding tanks. There is only a heater duct into the basment to keep the pipes in there from freezing. The tanks might get a little heat radiated through the floor of the trailer; but I would not count on it for much.