I have been thinking about this. My sewer pipe runs a substantial distance to the tank. It has been unusually cold here in NH this winter and my line is not very deep and not steeply pitched but it is pitched according to code. One thing that I know helps is that with every flush some warm air is pushed back up out of the tank and ultimately out the vent on my roof. I believe that it is better to not have a field vent in order to get this warm air coming up the pipe.
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