Holding Tank Heater

[tsunami]

Let me start out with this, if this isn't the right area to post this thread, feel free to move this. So I have, on my 2006 23 foot Safari, two switches that turn-on/turn-off the tank heaters. One is for the fresh water tank and the other is for the grey and black tank. There are a couple of question I am seeking answers to:
1 - are the tank heaters 12v or 120v?
2 - do the heaters turn themselves off after reaching a certain temp, and then activate when the temp drops below a set-point when powered on?
3 - is there a minimum volume required in the tanks before using them?

Please feel empowered to provide any information to this thread that you think is relevant to using holding tank heaters.

Thanks in advance

[rmkrum]

If they are like mine, they run on 12v power, come on when you turn them on, and turn off when you turn them off. They are designed to get warm, not hot. I've been out in 26 degree weather with them on with no tank issues.

I don't know how much they draw, but I ran them when hooked up to 30 amp 115v power. Last time it was that cold my city water hose froze up, so we had to run on tank water at night, hose thawed during the day and was hot damaged--I did not let it happen the next night, so I disconnected, drained and stored it safely inside in the afternoon.


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