HELP frozen black water tank, not valve

[wildwoodmusi]

The tank is fine, don't know why. I think it is plastic?

One thing I have learned over these past two years is that I don't have the knowledge to handle all this. Some of the things like the water heater have been replaced and all I have is the old manuals. When I bought it all the waterlines had to be replaced and they put in plastic with lots of levers I don't understand. On a ranch the mice are impossible. I put my bread and things in the oven to keep them safe and they got in there too. I have just bought a ten acre farm for me and my horses and am giving up. I think you need a lot of different skills to maintain a trailer. Things I could take care of alone in a house I just don't understand in a trailer. So, anyone interested in a "needs a lot of work" trailer

I admire all you people's perseverance and knowledge.

Thanks again,

Charlotte

[Pocyrus]

Surround the tank with insulation and leave some space to put a 20 watt light. I used this method for 2 massachusetts winters, and never froze up. I skirted with rigid 3/4 foam insulation, then boxed the tank area and lined with some r13 (pink stuff). I wired a cheap porcelain light base to an outdoor extension cord and placed it under the tanks. Kept it just warm enough not to freeze, and didn't burn the electricity a space heater would have.