I'm sorry if this is the wrong place to ask this question. I couldn't find any category I thought was more appropriate. Can someone please shed some light for me on the tank heaters or point me in the direction of manuals? I can't find anything in the Paradigm manual (I have a 340RL) and am getting conflicting information from Allies. Are the tank heaters thermostat controlled? In other words, if I have them turned on, will they only heat as needed or up to a certain temperature? I've been told to not have the tank heaters on unless the temp is below 45 degrees. That's no problem, but if they are thermostat controlled, why would that matter? I've also been told that leaving the tank heaters on above 45 degrees could cause the tanks to melt? Again, if they are indeed thermostat controlled, this should never happen. I thought I saw Bill Martin answer a question on FB where he said it wouldn't be a problem to have the heaters on even if the tanks were empty. However, someone else told me the tank needs to be 25% full to use the tank heater? I live in MT and need to use these, but want to make sure I am using them correctly. Thank you!