If you do choose to install tank heaters, remember that even though your valves may be "inside the heated space, they aren't protected "directly" by the tank heaters, and pulling the valve handle to dump the tanks may pull the rubber seal away from the valve body "IF" the seal is frozen to the valve slide.
Also, a leaking valve will allow small "rivulets of water" to leak past the heated space and can accumulate at the dump connection on the outside of the trailer. If you have that connection capped, then the water behind it can freeze and either prevent you from dumping the tanks or freeze and crack the 3" pipe, making parts of your entire holding tank system "inoperable until replaced"....
Also, remember that if you leave the tank valve open (or if it's leaking) the discharged water can fill your sewer hose and/or freeze at any low spot, making dumping an "impossible event" until the sewer hose thaws.
So, while tank heaters will help by providing some heat to keep the tanks from freezing, often they won't prevent the plumbing that connects the tanks to the outside sewer hose from freezing.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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