Originally Posted by MotocrossCamper
I completely disagree. I have never been worried about a glorified heating pad ruining my tanks. We use our arctic pack every year and have never had an issue. When camping in temps around 15 degrees I really don't want to try and dump frozen waste! Yes they draw a lot of power but anything that produces heat will. If you don't have a genny or shore power to keep things charged then you probably don't want to use them. There is also no reason to use it if you have no liquid in your tanks.
X2. They instructions you got should have said; DO NOT use them unless hooked up to power (generator or shore) as they use a lot of amps (as noted earlier, 7-9 amps per pad). They DON'T NEED to be used if the tanks are empty, but they will not melt anything.
In the North County (or Colorado Mountains) lots of people use pad heaters on car batteries and oil pans and there are LOTS of products for that. Typically those systems don't have thermostats on them unless you use an external one. Look here:
Here is a website to one of the most commonly used systems. Note that they have a lot more than just the tank heaters that FR uses, they can be used to protect the entire system. They are not cheap tho. Lots of information here.
UltraHeat, Inc. - Home
I think they are a great addition to the RV systems but like anything you need to look into them a bit to know how they work and how to use them.